請問.....

Author Message   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 05:23 pm:    bronze有咩用~? tin係咪都係一種matal present in bronze ga~?   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 05:25 pm:    仲有.. number of moles of cu in 352.8g of bronze點計~? (relative atomic mass of cu=63.5) 唔該^^"   Samson Username: 981125 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 05:30 pm:    bronze is a kind of alloy. it is a mixture of copper and tin alloy好像比純metal無咁易氧化 依D野本書都有架啦   唔駛做魚la^^"~Michael Username: 981087 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 05:30 pm:    Tin is a kind of metal.   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 05:31 pm:    我係想知bronze有咩用   Samson Username: 981125 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 05:31 pm:    咁要睇下幾%係copper幾%係tin   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 05:32 pm:    bronze is an alloy containing 90% by mass of cu   Inamoto5 Username: admin Registered: 04-2003 Posted on Thursday, April 17, 2003 - 05:36 pm:    352.8 g x 90% /63.5   Samson Username: 981125 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 05:39 pm:    352.8g*90%=317.52g 317.52g/63.5g=5.00moles   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 05:40 pm:    點解要係352.8g x 90% /63.5 ?   Samson Username: 981125 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 05:42 pm:    number of moles=mass/molar mass mass of Cu in the bronze is 352.8g*90%   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 05:43 pm:    �ü~"~ 真係可憐... 唔聽書攪到乜都唔識做=.=" 成份exercis都唔知有邊一題係識做..   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 05:48 pm:    仲有呀... d colours係咪一定要死記..~? 例如:Tetrachloromethane, iron(III)chloride, potassium dichromate, calcium hydroxide, calcium hydrogencarbonate..   Samson Username: 981125 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 05:54 pm:    唔使死記 首先group one的ion係全colourless group two係白色 其他在你讀完全本1B後就記得晒   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 05:57 pm:    咁即係溝色咁溝~? green+colourless=pale green~? blue+red=purple~? 1B本書係咪有講d coulour ga~? 知唔知大約起邊~?   Samson Username: 981125 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 06:06 pm:    1B無講,我意思係話你讀完中四""應該要""識晒   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 06:15 pm:    咁我而家點知 呢堆... Tetrachloromethane, iron(III)chloride, potassium dichromate, calcium hydroxide, calcium hydrogencarbonate.. 係咩色~?   Samson Username: 981125 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 06:22 pm:    1A有呀嗎~.~   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 06:25 pm:    where @@~?   Samson Username: 981125 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 06:35 pm:    76頁 自己再加些 Cu(II)2+ blue or green Fe(II)2+ green Ni(II)2+ green dichromate 2- organe [Cr2O7]2- Mn(II)2+ pale pink 而家發力仲追得上,千其唔好肥Chem呀   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 06:38 pm:    嗯~ 唔該唷~ 唔同既charge係咪有唔同色ga~? 但係...呢d又係咩色~? Tetrachloromethane, iron(III)chloride, potassium dichromate, calcium hydroxide, calcium hydrogencarbonate..   Samson Username: 981125 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 06:46 pm:    Tetrachloromethane我唔知=.=中四應該唔問 iron(III) ion咪yellow囉,76頁有 dichromate ion咪organe囉,我上面有講 calcium ion咪白囉,我上面又有講 group VII的個D halogen ion係無色的 OH-同HCO3-都係無色 有色的通常係metal ion   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 06:52 pm:    呢d都係中四既exercise黎ga ~"~ 我唔係好明呀...~ 我無聽過書...so...~ iron(III)chloride呢..~ 唔洗理個chloride ga~? 係咪總之iron(III)something就係yellow ga~? potassium dichromate唔洗理potassium~? 我真係唔識^^" 因為真係冇聽書~ 煩到你唔好意思~ 唔該哂..^^"   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 06:57 pm:    再問返之前既問題..~ bronze有咩用途~?   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 06:59 pm:    銅像=.=   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 07:00 pm:    書有@@" 但係點寫~?   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 07:06 pm:    書淨係有幅圖有個佛寫住"A bronze object."   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 07:13 pm:    都冇幾何會問d咁ge野la   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 07:17 pm:    死啦死啦=_=" 我一路做一路就愈多問題..愈多唔識... d formula係咪refer返本data book果d ga咋~? 例如: iron(III)chloride係咪就咁.. 將Fe3+同Cl-合埋變成Fe3+Cl-就得ga=.=?   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 07:18 pm:    唔係呀~ hing~ 我做緊果張worksheet就問我呢個問題=.="   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 07:19 pm:    算la.. 我建議你drop左佢... 我好後悔冇drop到..>< 不過都係自己諗清楚好   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 07:20 pm:    銅像=bronze starue   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 07:21 pm:    下..!? drop... 我諗我完全唔會考慮drop chem-_- 雖然係難..都唔及amaths難...~ 如果我係drop都drop art或者amaths先=.=   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 07:22 pm:    咁努力喇   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 07:23 pm:    哦~ bronze starue.... 唔該唷>v<   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 07:23 pm:    哈哈..~ 做所有既野要做得好~ 唯一既方法就係... 努力~~!!   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 07:25 pm:    sor.. statue先岩呀   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 07:27 pm:    哦哦哦~ 唔洗sor~~ ^v^   唔駛做魚la^^"~Michael Username: 981087 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 08:41 pm:    For iron(III)chloride there are Fe 3+ ions and Cl- ions Since a normal compound must be neutral charge So there should be 3 Cl- to combine with one Fe3+ Hence the formula is FeCl3   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 08:51 pm:    @@~ quite difficult to understand~ can you tell me more~? For the: calciun hydroxide, potassium dichromate.. thank you for your kind attention.   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 08:54 pm:    其實我對d關於formula呀...~ equation呀呢d都唔係好識~~ so...i think i must try more hard to追返d野了~   唔駛做魚la^^"~Michael Username: 981087 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 09:03 pm:    其實好簡單, 你要知道所有ions既charge先 例如有樣compound 有A 同B 既ions 同時A ion = A+ B ion = B- 咁你要balance個charge(即係令compound冇 +/- 的charge) => AB is the formula if A2+ B- then AB2 (because A has 2 +ve charges but B only only hv one , so two B is required to balance with one A) By the way, How would you balance A3+ B2-?   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 09:06 pm:    um....俾少少時間我...   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 09:11 pm:    我唔係好識呀~ 係咪...A2B3呀...?   唔駛做魚la^^"~Michael Username: 981087 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 09:13 pm:    That's right   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 09:21 pm:    >w< 好開心呀~ o岩左..~ 咁calcium hydroxide係咪CaOH2..~?   唔駛做魚la^^"~Michael Username: 981087 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 09:25 pm:    冇錯 but remember to add blanket to OH (OH)2   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 09:31 pm:    好開心呀 >w< ~~~~ 等我做多兩個先~ potassium dichromate = K2Cr2O7 calcium hydrogencarbonate = Ca(HCO3)2 o岩唔o岩呀 o_o ~? 食飯仔先@@~   唔駛做魚la^^"~Michael Username: 981087 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 09:35 pm:    right   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Thursday, April 17, 2003 - 09:43 pm:    多謝你教我呀~~ =3= 有咩唔明我會繼續煩你ga >v< ~   Chio U Kim Username: cuk Registered: 04-2003 Posted on Thursday, April 17, 2003 - 11:44 pm:    Please note that Na+(aq) and Cl-(aq) are colourless but NaCl(s) is white. As a rule of thumb, a white solid (if soluble in water) always gives a colourless aqueous solution. Question 1 : What is the colour of solid potassium carbonate ? Question 2 : Given that solid calcium carbonate is white, describe what you would observe when solid calcium carbonate is added to water.   Chio U Kim Username: cuk Registered: 04-2003 Posted on Thursday, April 17, 2003 - 11:46 pm:    Tetrachloromethane (CCl4) is a colourless liquid.   Chio U Kim Username: cuk Registered: 04-2003 Posted on Thursday, April 17, 2003 - 11:49 pm:    Refer to datatable 8 for the properties and uses of common alloys   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Friday, April 18, 2003 - 03:49 pm:    CCl4係唔係organic solvent (有機溶液)~?   Samson Username: 981125 Registered: 04-2003 Posted on Friday, April 18, 2003 - 04:33 pm:    係 他們叫做non-polar solvent(e.g.1,1,1 trichloroethane, ester) 可以dissolve一些molecular substance(e.g.halogen, organic compound) 而有一solvent就唔知係polar定non-polar solvent 就係alkanols(e.g.methanol, ethanol) 佢可以dissolve oil同water 你中五會學   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Friday, April 18, 2003 - 09:03 pm:    哦哦~~ formula mass係咪淨係乘來乘去嫁咋~?   Samson Username: 981125 Registered: 04-2003 Posted on Friday, April 18, 2003 - 09:06 pm:    其實只記 number of moles=mass/molar mass 便行 page112   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Friday, April 18, 2003 - 09:22 pm:    咁formula mass係同number of moles一樣~? 等我睇下先....~ A書~?   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Saturday, April 19, 2003 - 10:47 am:    哎..諗起樣野.. 你地有冇買參考書ga?? only睇課本ga?   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Saturday, April 19, 2003 - 03:03 pm:    is it necessary~?   ＨｉＮＧ∼ Username: 981909 Registered: 04-2003 Posted on Saturday, April 19, 2003 - 03:20 pm:    no just ask   Samson Username: 981125 Registered: 04-2003 Posted on Saturday, April 19, 2003 - 04:19 pm:    我無 不過我呀哥有D九幾至九幾的PAST PAPER   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Saturday, April 19, 2003 - 06:21 pm:    i think past paper is enough..~ >v<   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 03, 2003 - 10:05 pm:    睇返chio sir之前既問題.. Question 1: What is the colour of solid potassium carbonate? Question 2: Given that solid calcium carbonate is white, describe what you would observe when solid calcium carbonate is added to water. 我唔係好識啵...~   Inamoto5 Username: admin Registered: 04-2003 Posted on Sunday, May 04, 2003 - 10:11 pm:    Q1. White. Q2. Insoluble (more exactly slightly soluble)   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Monday, May 05, 2003 - 02:32 pm:    飲飲下汽水突然有d野想問 >﹏< 汽水入面係co2就好多人都知啦...~ 但係我想知既係.. d co2係用咩方法整入d水入面~? 一支500ml既汽水入面有幾多co2~? *o*   981909 Username: 981909 Registered: 04-2003 Posted on Monday, May 05, 2003 - 02:35 pm:    你睇下pastpaper就知... 我記得有年出過..   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Monday, May 05, 2003 - 02:37 pm:    但係我冇@@"   981909 Username: 981909 Registered: 04-2003 Posted on Monday, May 05, 2003 - 03:45 pm:    ..................... 憑我記憶.. 好�ü加壓令到d CO2 溶係水到   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Monday, May 05, 2003 - 06:23 pm:    我form4係冇嫁喇^^" 咁得意~? 如果照你咁講... 即係將d co2同d水壓埋一齊就會變成有氣既水@@~?   981909 Username: 981909 Registered: 04-2003 Posted on Monday, May 05, 2003 - 08:39 pm:    01 Q3 A Explain why the fizzy drink becomes less fizzy after the can has been opened for some time. (hints: carbonated water is produced by divssolving CO2 in water under pressure)   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Monday, May 05, 2003 - 08:47 pm:    @[]@ ~   981909 Username: 981909 Registered: 04-2003 Posted on Monday, May 05, 2003 - 08:52 pm:    @[]@ ~ 點解????   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Monday, May 05, 2003 - 08:55 pm:    @[]@ ~ 驚嘆...   981909 Username: 981909 Registered: 04-2003 Posted on Monday, May 05, 2003 - 08:59 pm:    有咩好驚嘆?   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Monday, May 05, 2003 - 09:05 pm:    想像唔到d co2點壓入d水入面...=_=   981909 Username: 981909 Registered: 04-2003 Posted on Monday, May 05, 2003 - 09:26 pm:    ...........   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Tuesday, May 06, 2003 - 04:12 pm:    >w< heehe~   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Wednesday, May 07, 2003 - 02:55 pm:    雖然唔係好關chem事.. 但係我都想大家俾下意見~ ^^" 大家認為地球冇乜殞石既原因, 係咪因為木星既引力影響呢~? 而木星係咪地球既守護星~? ↑我自己認為就係喇..~ 唔知大家又點睇~?   981909 Username: 981909 Registered: 04-2003 Posted on Wednesday, May 07, 2003 - 03:22 pm:    點解你咁認為?   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Friday, May 09, 2003 - 04:17 pm:    因為我有印象好�ü唔知起邊度聽過..~ 唔係好記得..但係又突然間諗起~   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 09, 2003 - 04:28 pm:    但係關chem咩事呢?你係咪post錯地方?   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Friday, May 09, 2003 - 04:32 pm:    洗唔洗咁串喎...~ 我一早講左話唔係好關chem事ga啦~ 我見呢個topic係我自己開ga嘛~ 唔係俾意見我就唔好出聲啦=_=   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Friday, May 09, 2003 - 04:37 pm:    ｈｉｎｇ∼ 做咩無啦啦用返ｎｕｍｂｅｒ唔改名既∼？   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 09, 2003 - 05:08 pm:    使唔使咁惡呀=.=.. 想叫你去miscell個到開返個ja ma.. 依到唔係讀chem的都唔入黎la... 你聽過咩叫返璞歸真未?   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Friday, May 09, 2003 - 09:00 pm:    我係個中文好差既人..~   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Friday, May 09, 2003 - 09:03 pm:    有冇人可以話我知今次UT.. Ch9-11邊課佔得最多~? 同埋會有幾多條MC同QUESTIONS呢~? 仲有今次會唔會好�ü上次咁有BONUS既ESSAY嫁~?   981909 Username: 981909 Registered: 04-2003 Posted on Monday, May 12, 2003 - 09:25 pm:    都係冇人理你... 開個果NEW POST LA... 寫個果topic..咁方便人又方便自己... 唔好鬧我呀... 驚ga會..   浪貓 yan..~* Username: 991160 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 07:20 pm:    唔好講到我咁惡=_="   981909 Username: 981909 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 07:27 pm:    但係你係=.=   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 07:28 pm:    唔係>_<   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 07:35 pm:    好想試下用d acid整落d bleach度=_=" 好想睇下一大舊綠色爆出黎果個境-.- 一定好好睇+_+ 好想試下..>﹏<   981909 Username: 981909 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 07:48 pm:    好..你去試la... 搵部cam拍低去.. 跟住叫定白車都岩ga la.... ps.我相信唔會一舊綠色野爆出黎咁勁   981909 Username: 981909 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 07:48 pm:    做咩改過咁長�鵀W??   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 07:58 pm:    好主意喎..@@~ 吹水王話會有一大舊chlorine gas爆出黎~ 如果唔係佢咁講我都唔會咁想試@@~ 我個名唔型咩=_=?   981909 Username: 981909 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 08:00 pm:    一定唔會一大舊la.. reaction都要時間ga ma... 吹水混你咋~ 唔型~   981909 Username: 981909 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 08:06 pm:    不如你試下mix K 同水丫.. 好�ü話好勁... 但係未試過....>_<   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 08:16 pm:    水邊夠勁呀.. 梗係同acid先勁啦~ 呀sir話佢咁大個仔都未試過~   981909 Username: 981909 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 08:26 pm:    再吹下依個post就到100喇   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 08:37 pm:    哈哈哈哈!!!!!!!!!!!!!!!!!!!!! 我係第一百個~~~~~~~~~ye@h o_ov 我係咪好低b @_@? 會唔會俾人鬧=_=?   Fender Username: 981036 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 08:38 pm:    會!   981909 Username: 981909 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 08:40 pm:    我相信唔會.. 但係好想會~   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 08:42 pm:    =_="   981909 Username: 981909 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 08:54 pm:    hahahahahaha~<----無聊   Fender Username: 981036 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 09:09 pm:    快d溫書啦~~   981909 Username: 981909 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 09:19 pm:    冇心情   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 09:21 pm:    我溫緊chem >v<   981909 Username: 981909 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 09:32 pm:    星期六測?   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 10:26 pm:    yes   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:29 pm:    我發現好易會攪亂redox同cell呀...   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:30 pm:    唔明你講咩   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:34 pm:    即係chemical cell同redox reaction..   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:36 pm:    二樣野有咩關係??   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:40 pm:    我就係攪唔清楚兩者既分別.. 都係兩支野同個beaker..   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:41 pm:    redox係二支野ga咩??? 你係咪講緊電解呀?   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:44 pm:    �ü...好亂呀=.=" redox唔係兩支野ga咩...? 我一路都係睇緊ch9,10咋.. 都未到電解..   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:45 pm:    redox有冇電流ga=.="   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:47 pm:    我都唔明你唔明d咩.. redox係睇oxidation no. ga ma.... cell除左d reaction之外都唔係好難ja ma... d reaction係煩=.=   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:48 pm:    redox都唔關current事...   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:48 pm:    咁redox同cell其實係咪一d關係都冇?   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:49 pm:    CuO+C--->Cu+CO Cu reduction C oxidation Ox no. Cu 2+-->0 C 0-->2+   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:50 pm:    可以話係.. 所以我都唔明你有咩唔明.. 就係咁解   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:51 pm:    我唔係好明   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:56 pm:    咩唔明 equation?   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:56 pm:    我想問返.. cell有reaction咩~? 唔係只要兩種唔同既metals同any electrolyte就會有電流出ga咋咩... 仲會有d咩reaction呢.. 恕我有點兒蠢...勞煩   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:57 pm:    你上面既equation係咪redox黎ga~?   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 06:58 pm:    cell果到你睇書la... zinc-carbon cell入面好多reaction.. 見到都想死... 你明唔明redox係咩先?   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:00 pm:    cell果d係d half equation咋嘛... redox同cell係咪一d關係都冇先~? cell入面其實係咪carry out緊redox reaction~?   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:02 pm:    PCl 3 + Cl 2--> PCl 5 redox reaction 上面果個唔好理.. 好�ü錯   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:03 pm:    我想知既係cell同redox冇有咩關係~?   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:04 pm:    係有冇..唔係冇有..   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:06 pm:    算la... 我都係唔講喇.. 自己chem又唔係好好..教錯你就唔好意思.. 你都係開個果new post問人la   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:06 pm:    @_@"   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:07 pm:    ...............   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:11 pm:    我想知chemical cell同redox reaction有冇咩關係..? 即係cell入面會唔會有redox既reaction...? 而家我自己攪到勁亂...希望有人可以幫到我..   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:13 pm:    我盡力la.. 首先你明唔明咩係redox先.. cell到你唔好理住   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:14 pm:    即係oxidation同reduction   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:16 pm:    咁所有reaction同時有oxidation同reduction就叫redox..... 所以你要知cell有冇redox..睇下有冇做reduction同oxidation咪得囉   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:19 pm:    一粒zinc carbon cell (text book 1b p.13) 佢既cathode其實係唔係做緊reduction? 而anode又係唔係做緊oxidation..?   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:21 pm:    red cat (redction cathode) an ox ( anode oxidation) 所有cell同電解都岩用   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:22 pm:    咁即係其實cell係做緊redox?   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:24 pm:    redox reaction 係要係同一個reaction到做先算係ga   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:25 pm:    你意思係話reduction同oxidation要同時進行~?   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:26 pm:    係   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:27 pm:    咁cell唔係ga咩~?   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:28 pm:    你可唔可以用同一條equation表達到個reaction?   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:30 pm:    PCl 3 + Cl 2--> PCl 5 係一個redox係因為你可以睇到 oxidation number有一個升一個跌   Chio U Kim Username: cuk Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:30 pm:    All reactions happening in chemical cells are redox reactions. But redox reactions can happen not only in chemical cells. Redox reactions can take place in test tubes, during electrolysis, on the surface of iron during rusting, etc....   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:31 pm:    即係我淨係可以寫anode或者cathode既equation.. 而唔可以一條過寫哂出黎..係因為佢地唔係同一時間做.. 所以sell入面既係就係oxidation同reduction.. 但係就唔係redox..係咪即係咁~?   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:32 pm:    cell係redox?   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:33 pm:    �üsir話所有係cell到的reaction係redox呀   Chio U Kim Username: cuk Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:33 pm:    Oxidation and reduction always happen at the same time. That is why the reactions are called redox reactions. One cannot happen without the other!   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:35 pm:    咁我點分cell同redox.. 定係佢地跟本係一樣野黎+___+   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:35 pm:    icic... 都話我chem好差ga la.... 好采已後唔使讀ja.. 真開心   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:36 pm:    =______= 聽日要測呀....   Chio U Kim Username: cuk Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:40 pm:    The same redox reaction can happen in a chemical cell and in a test tube. For example : 2I-(aq) + 2Fe3+(aq) ® I2(aq) + 2Fe2+(aq) Refer to Chem 2000 Book 1B p.34 ® cell reaction p.35 ® direct reaction (the same reaction happening in a test tube)   981909 Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:40 pm:    其實我都係唔明你有咩唔明... cell係俾電.. redox係講reaction... 點會mix左二樣野ga...   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:42 pm:    好亂呀我+____+   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:45 pm:    係咪即係cell入面既redox reaction會produce電=.=?   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:47 pm:    另外想問.. test book 1b p.44,45.. d equcation係咪背會好過自己balance呢...? 會建議我背定係balance?   Chio U Kim Username: cuk Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:49 pm:    If the reaction takes place in a chemical cell, the chemical energy is converted into electrical energy. If the same reaction takes place in a test tube, the chemical energy is converted into heat. And it is a waste of energy because we cannot make use of the heat energy easily. That is why chemical cells are useful. Chemical cells are energy converters that change chemical energy into useful electrical energy.   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:50 pm:    即係redox係靠cell去produce電~?   Chio U Kim Username: cuk Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:51 pm:    It is up to you to remember all redox reactions or not. Let's take a break because it is time for me to have dinner.   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 07:52 pm:    哈哈~~~~ thank you for your kind attention   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 08:32 pm:    service life同shelf life分別係咩~? 兩者有咩唔同~?   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 08:52 pm:    一個係用得幾耐．． 一個係有幾耐有效期．．．   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 09:11 pm:    哦   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 09:13 pm:    你�ü乎冇聽書喎   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 09:32 pm:    唔係..我記得我有聽.. 呀sir的確冇乜特別講過..   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 09:39 pm:    冇可能... 吹水教我個陣都有講... 要留心上佢堂呀.. 有時係吹水的過程中會講左d好緊要的野ga   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 09:41 pm:    傻啦..我呢排勁留心上堂.. 我勁問佢拎tip屎..正..-.-v   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 09:43 pm:    呀呀呀.. 計oxidation number係咪要背野ga....? 係咪要背果d charges on ions呀..?   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 09:46 pm:    都叫你買本參考書.. 我一陣打上黎俾你   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 09:48 pm:    好好好好~ 釘橋~   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 09:57 pm:    釘橋=_=" ---------------------Ox no. Any free elements______0 Compounds: ions of Gp 1___________+1 ions of Gp 2___________+2 Fluorine compounds_____-1 Hydrogen compounds____+1 Oxygen compounds______-2 Simple ions________Eq to the change of the ions (made of 1 atom only) examples:Iron(2) compound +2 ________Iron(3) compound +3 ps.可唔可以係到買賣舊書.. 我有好多書=.=   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 09:58 pm:    依d野書都有.. 點解唔自己搵=.="   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 09:59 pm:    如果真係o岩用..真係好喎...~   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:02 pm:    I want to ask ar~~ Hydrogen compound is +1, But sir said that Hydrogen + mtal is +1 wow??!! (^o^)   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:02 pm:    Zn 2+ Lead 2+ Cr 2+ NH4 1+ OH 1- HCO3 1- CO3 2+ NO2 1- NO3 1- HSO4 1- SO3 2- SO4 2- PO4 3- MnO4 3- Cr2O7 2- 當然唔係全部記晒.. 而且係有方法記得.. 點記就自己諗   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:03 pm:    wt is Hydrogen + mtal ? 俾個例子   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:04 pm:    I see la!! Thx~~ ^0^   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:05 pm:    你�ü既方法係上面果d~~~?   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:05 pm:    Like LiAlH law!!   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:06 pm:    @_@" �ü(音:子)   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:08 pm:    Sorry is -1 ar!!   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:08 pm:    個d係要記的野... 記法自己諗.. 咩係LiAlH??   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:10 pm:    補習sir write ga!!仲有KH ar!! In KH, hydrogen is -1 ar!!   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:10 pm:    嗯嗯~唔該~   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:12 pm:    KH =.=" 我未見過依隻野.. 可能有都唔出奇.. 不過應該唔係CE level...   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:13 pm:    I c la! Thx ar~   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:15 pm:    Ox no.係 +/-行先..-1 charge係 數字行先 1-   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:17 pm:    仲有ar: 1.why ions of reactive metals are weak oxidizing agent?? 2. Why ions in Gp I and Gp III metals cannot lose electrons?? Thx~~X1000000000000   Inamoto5 Username: admin Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:21 pm:    LiAlH4 is a reducing agent commonly used in organic reaction   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:23 pm:    How about KH la??   Inamoto5 Username: admin Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:24 pm:    LiAlH4 is a reducing agent commonly used in organic reaction   Inamoto5 Username: admin Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:25 pm:    I think all of you are talking about hydride....e.g. LiH...the oxidiation no. of hydrogen in this compound is -1   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:26 pm:    重申.我chem好差..唔好盡信..最好問�üsir 如果我錯..唔該�ü正我... 1.oxidation係係俾electron....因為Gp1咁reactive...冇野可以俾到電子佢..應該係佢地放電子...所以佢地係weak oxidizing agent... 2.唔明..有冇例子?   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:27 pm:    點解吹水你好�ü冇講過ge?   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:28 pm:    Why 2 solution 太相近 will have low reaction la?(redox ar)   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:29 pm:    我唔記得左咩叫leakproof^^"   Chio U Kim Username: cuk Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:30 pm:    LiAlH4 is lithium aluminium hydride or lithium tetrahydridoaluminate. The hydrogen in it has an ON of -1. H ® e- + H+(hydrogen ion) H + e- ® H- (hydride ion) A hydride ion has the same electron structure as a helium atom. Hydrogen reacts with reactive metals to give metal hydrides. E.g. E.g. 2Li + H2 ® 2LiH   Chio U Kim Username: cuk Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:32 pm:    What is the ON of oxygen in hydrogen peroxide, H2O2?   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:34 pm:    +2? 到中五都唔識依d野..>_<   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:35 pm:    係囉...好�ü咁鬼深...   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:37 pm:    Oxygen is not alwasys -2 ma??   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:38 pm:    呀..我睇左hydrogen.. 應該係-2   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:40 pm:    i think MOST compounds of oxygen is -2..   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:41 pm:    The answer?   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:42 pm:    書話係...=.=" (text book 1b p.36)   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:43 pm:    Sorry~is me again! Q1. What is perferentially Discharge?? Q2. Is acidified means that adding hydrogen to remove the oxyen ar??   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:44 pm:    e...吹水icq on左line=.=   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:46 pm:    I cannot on ar!! My mum~~~~~   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:47 pm:    Help me to ask him ar!! Give me is no. too!   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:48 pm:    perferentially Discharge 正常黎講係跟個ECS 決定邊隻野discharge ga ma.. 但係當1.某隻野濃度高..而係ECS入面的位置相近..濃d個隻就會discharge 2.electrode問題..睇書有examples.. 我又想知吹水icq喎   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:51 pm:    我諗佢唔介意呱... 4127349   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:51 pm:    not understand ar?? Can u tell me more ar??   Chio U Kim Username: cuk Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:52 pm:    ON of Oxygen in H2O2 is -1 Since ON of hydrogen is +1 2x(+1) + 2x(ON of Oxygen) = 0 => ON of Oxygen = -1 This is always true for any peroxide such as sodium peroxide(Na2O2), potassium peroxide(K2O2, etc....   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:52 pm:    p.s. ecs=electrochemical series of metals   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:54 pm:    其實discharge既中文係咩~?   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:55 pm:    That means only something O2, then ON of oxygen is -1. Normally, oxygen is -2. Right??   Inamoto5 Username: admin Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:55 pm:    Mr. Hing... because hydride is not neccessary in Syllabus..^^;;   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:56 pm:    我知喇... discharge=放電...   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:57 pm:    興先生...聽到呀sir講咩未呀=.=?   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:58 pm:    Ｈｉｎｇ∼ electrode in wt page ar??   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:58 pm:    �üSIR.. 我係Mr. Leung =.=   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 10:59 pm:    電解個課.. 唔知係邊...=.=   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:00 pm:    P65-66 bk 1b   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:01 pm:    Is acidified means that adding hydrogen to remove the oxyen ar??   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:01 pm:    係咪p.32,33...?   Chio U Kim Username: cuk Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:01 pm:    Let's consider the electrolysis of very dilute sodium chloride solution. There are two kinds of cations, namely H+ and Na+ in the solution. During electrolysis, both H+ ion and Na+ ion are attracted to the cathode, but only H+ can be discharged (can lose its charge!) since it can gain electron more easily. So we can say H+ is preferentially discharged at the cathode. Also refer to Chem 2000 Bk 1B pp.62-63 for the three factors affecting the discharge of ions.   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:02 pm:    =/="   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:02 pm:    THx la~~~~ I cannot sleep tonight ar~~ =.='   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:03 pm:    又學到唔小野.. 真係正.. 學野仲快過上堂~^^   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:04 pm:    我都唔訓得... bio溫左一課咋............=.=   Chio U Kim Username: cuk Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:07 pm:    To acidify a solution means to make the solution acidic by adding an acid. Usually, it is done by adding sulphuric acid. E.g. acidified KMnO4 = KMnO4(aq) + H2SO4(aq) acidified K2Cr2O7 = K2Cr2O7(aq) + H2SO4(aq)   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:08 pm:    真開心.. 我又可以訓大'交'~~~ 加油la..haha~~~   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:10 pm:    風涼話=_=   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:10 pm:    =.=' yan ~can i call your mobil ar?   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:11 pm:    ok=.="   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:12 pm:    就冇電~ =.=" 一陣可能講講下冇電=.= 不過有電換...-.-   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:14 pm:    OK!! I haven't touch bio!! You really not sleep!! Me and hai not sleep ar!! call mobil ar!!   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:16 pm:    okok=.=" (再講會俾人鬧....)   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:20 pm:    落街買ice-cream同coffee先=.= u can phone me whenever.. also..i will be here tonight=.=" (唔好鬧我...最後一次...+_=)   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:24 pm:    Chio sir: only adding acid, no need to do any other things ??   Chio U Kim Username: cuk Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:25 pm:    No need!   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:32 pm:    If a Q said a solution, then i let the solution is dilute or concentraded ar??   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:33 pm:    negative electrode ≠ anode ?   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:35 pm:    一般會當佢係dilute.. 但係如果佢真係冇講.. 你答con or dilute佢都要俾分你..   Chio U Kim Username: cuk Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:38 pm:    In an electrochemical cell, -ve electrode = anode In an electrolytic cell, -ve electrode = cathode   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:38 pm:    唔該...我想問返.. 我唔記得左咩叫leakproof.. 可唔可以話我知...~   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:39 pm:    but 補習&#22000;sir say let it be concentraded wow! Yan~~ u back la!? So fast wo!!   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:39 pm:    in zinc carbon cell, the zinc case = anode ? how about the steel disc..?   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:43 pm:    我唔知喎..我都係聽吹水講..~ 我落到去冇哂軟雪糕呀... only two cans of nescafe (creme white) ja~   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:46 pm:    i see!!!!!! I have ice-cream eat ar!!!!!   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:47 pm:    ................=.=" 算啦..睇黎呀sir好�ü已經leave左..-.-   Chio U Kim Username: cuk Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:48 pm:    Leakproof : to secure against leakage (防漏) Waterproof : 防水 Fireproof : 防火 Apollo 2000 is a fireproof paint invented by our Alumnus!   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:48 pm:    In 99 CE, it set a experiment like book1B P.63, fig 11.9, it asked for a suitable material for the electrodes wow. How to answer ar????   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:48 pm:    呀sir一講即到o.o"   Chio U Kim Username: cuk Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:55 pm:    In the electrolysis of acidified water, platinum electrode rather than carbon electrode is used because carbon electrode can react with oxygen to give carbon dioxide gas. However, carbon electrode rather than platinum electrode is used in the electrolysis of dilute or concentrated sodium chloride soluton because chlorine formed at the anode can react with platinum to give a complex.   Sapphire Username: 991097 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:58 pm:    Wt is the function of the carbon rod in a zinc-carbon cell??   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Friday, May 16, 2003 - 11:58 pm:    唔係喎...如果係書既p.63 佢本身唔係用carbon electrode.. 佢係用hofmann voltameter喎..   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:01 am:    The electrodes of the Hofmann voltameter are made of Platinum foil (Pt foil)! Take a closer look at the figure!   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:03 am:    The carbon rod in the zinc-carbon cell functions as an electrode(+ve) to allow passage of electrons.   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:04 am:    i know...but as sapphire asked... the suitable material for the electrodes.. answer is platinum foil (Pt foil)?   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:04 am:    But in the CE paper it asked u to choose a suitable material!!   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:06 am:    係咪即係platium foil?   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:07 am:    Yes!   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:07 am:    -.-v bingo~   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:08 am:    Platinum and carbon are materials !   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:09 am:    死啦...我始終唔係好熟electrolysis...   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:10 am:    Hence, explain why a little sulphuric acid has been added to the water wow! I know the concept, but i don't know how to write ar!!! Help me!!Thx~~~~~~~   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:12 am:    我諗聽日份卷唔會出咁多咁深入既野呱....   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:13 am:    呱?? I think it will ar!!!!!!   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:13 am:    To increase the conductivity of the solution. Since water alone is a poor electrolyte. Water molecules only ionize slightly to give H+ions and OH- ions.   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:14 am:    Aman wong away ma?? ICQ also ar??   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:14 am:    我地真係要多謝呀sir耶~ 咁夜都仲起度答地問題... bio就慘啦..d問題問左幾日都冇人答... 我bio都未溫..   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:15 am:    佢n/a   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:16 am:    即係整到d water勁d啦=/=...   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:18 am:    suggest a chemical test to show the presence of ammonium ions in the moist paste of ammonium chloride in zinc-carbon cell??!! How to answer, have we learn??   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:19 am:    死啦...我唔係好明p.59果d equation呀...   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:20 am:    Chio sir: you know bio.?? Can we ask u ar??   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:20 am:    The total no. of posts just exceeds 500. I've got to leave now. You guys work hard and add oil Ar. Bye!   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:20 am:    我地應該未學到呀嘛...   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:21 am:    why not understand ar?? not too difficult !!!!   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:21 am:    ask amen wong la...   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:22 am:    Then no sir la??   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:23 am:    係唔係又係balance ga... 我睇左好多次都睇唔到...   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:23 am:    amen wong here ma??   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:23 am:    Sapphire, the answer can be found in the marking scheme of Assessment Chapters 9-10 at this link. http://www.ilc.edu.hk/SubjectWeb/ChemWeb/S4%20Test/S4_test.html   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:24 am:    i think only amen exceeds...   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:25 am:    In P.59, &#30005;解molten lead(II)bromide ma!!Do you understand the cathode and anode ar??   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:26 am:    我問呀sir一陣會唔會上黎.. 佢n/a..未答我..   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:27 am:    Call amen to go to here la!!   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:28 am:    我唔明你講咩....   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:29 am:    Chio sir: here ma?? I cannot go to the link ar!! It need password to open ar!!!!   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:30 am:    我call就call左喇... 上唔上就唔知...等下先囉...   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:30 am:    the password for the pdf file is 'chow'.   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:33 am:    呢個post都就到300喇=______=" p.s.第100同200個post都係我黎ga...=.=v   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:37 am:    In the link, i cannot find this Q wow: suggest a chemical test to show the presence of ammonium ions in the moist paste of ammonium chloride in zinc-carbon cell??!!   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:39 am:    第300個........@_@v   喵喵喵喵喵喵喵喵喵.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:40 am:    我開都開唔到.... 但係我地教左點test for ammonium喇咩...?   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:44 am:    好�ü未ar!!!!!   等待amen wong的到來.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:45 am:    我覺得electrolysis呢一課好睇整都唔係好明..+_+ 死得喇.....點算好=/="   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:45 am:    Call amen la!!!!!!! Many Q ask ar!!!!! He said tonight he will be here ga!!!!!!   等待amen wong的到來.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:45 am:    我個名型ma=.=?   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:46 am:    型bow la!!!!   等待amen wong的到來.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:48 am:    electrolysis你掂唔掂呀?   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:49 am:    OK la!!! Bio ar~~~~~   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:50 am:    Test for ammonium ion. See Q.12(e)(ii) Warmed with NaOH, the gas evolved turns moist red litmus paper blue.   等待amen wong的到來.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:51 am:    我唔係好識electrolysis呀.... 睇整都好�ü一舊野咁...都唔識... 我唔想放棄呀..但係又唔知點解喎..   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:55 am:    Consider the following chemical equation: wHN3(g)+xO2(g)-->yNO(g)+zH2o(I) Which of the following combinations is correct? A. x=6, y=4, y=8 B. x=4, y=5, z=3 C. x=5, y=4, z=6 D. x=3, y= 4, z=2 Why is C ar??   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:57 am:    wt Q12 ar??   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 12:58 am:    Add oil ar!!!!!! I want to give up bio too~~=.=   等待amen wong的到來.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:00 am:    ......+_+" bio淨係d圖都可以讀死你....=.=   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:01 am:    die &#21655; la!!!!   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:06 am:    here??   等待amen wong的到來.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:07 am:    我點先知electrolysis咩會去+ve咩會去-ve 係咪返個ecs..可唔可以話我知...   等待amen wong的到來.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:08 am:    跟返..漏左個跟字...   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:10 am:    4NH3 + 5O2 ® 4NO + 6H2O   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:11 am:    +ve go to cathode -ve go to anode   等待amen wong的到來.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:13 am:    即又要背d charges on ions????????????   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:15 am:    Yan, Just follow these rules when tackling problems of electrolysis : In an electrolytic cell, 1. the -ve electrode is the cathode. 2. the +ve electrode is the anode. 3. cations always go to cathode. 4. anions always go to anode.   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:15 am:    But how to計??   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:17 am:    All ions in datatable 6 must be memorized!   等待amen wong的到來.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:18 am:    我淨係記住呢四個rules就okay~?   等待amen wong的到來.... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:21 am:    oh god...我上學期荒廢左chem... 而家要再背返..~"~   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:23 am:    Four more ! 5. reduction at cathode : red cat 6. oxidation at anode : an ox 7. Oxidation is the loss of electrons 8. Reduction is the gain of electrons   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:23 am:    wt is the ON of N ar??   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:24 am:    Chio sir is not going to sleep ma?? ^o^   加油努力... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:25 am:    ON = oxidation number ?   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:26 am:    yes~~ change name wow   加油努力... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:26 am:    chio sir太好人喇>o< 好感動.... 王公子...佢....佢...off左呀!!!!!!!!   加油努力... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:27 am:    佢太過份...   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:28 am:    One last rule : Oxidation involves an Increase in oxidation number and a Loss of electrons OIL   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:29 am:    ON is oxidation number   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:29 am:    wt is the ON of N ar??   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:30 am:    王公子.......he off?? He promiss me to come here today!!!   加油努力... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:32 am:    ya....佢真係...   加油努力... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:33 am:    咩係ionization of water?   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:35 am:    ON of nitrogen : NH3 = -3 NO = +2 NO2 = +4 HNO3 = +5 You work out the ON of nitrogen in the following species: NH4NO3 = N2H4 = HNO2   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:38 am:    Ionization of water means the decomposition of water molecules to give hydrogen ions and hydroxide ions. H2O ® H+ + OH-   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:39 am:    我真係唔係好識...............死火..   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:39 am:    NH4NO3 =-1 N2H4 = -2 HNO2= +3 right?   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:40 am:    哦..明解   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:42 am:    N2H4我都識.. 但係其他就...   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:43 am:    Not at all ! NH4NO3 N = -3, N = +5   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:44 am:    I have not touch bio ar~   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:44 am:    如果SAPPHIREo岩 第一個我都知了   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:45 am:    OH!!Sorry !!I forgot ar!! I understand now! THanks~~   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:46 am:    why not equal to -1?   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:48 am:    NH4NO3 consists of NH4+ and NO3- In NH4+, N = -3 In NO3-, N = +5   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:48 am:    because NO3 =-1   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:49 am:    Refer to Chem 2000 Bk 1B p.38 Class practice 6   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:49 am:    So sleepy ar~~~   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:50 am:    我仲係知.........=.=" 都怪我之前唔聽書.......   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:51 am:    仲係唔知...   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:51 am:    Why voitage steady is good for 脆弱的零件?   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:53 am:    In NH4+, N + 4x(+1) = +1 => N = -3 In NO3-, N + 3x(-2) = -1 => N = +5   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:56 am:    係等於個charge...?   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:58 am:    Yes! Refer to rule 5 on p.36 Chem 2000 Bk 1B   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 01:59 am:    救命呀.....=o="   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:00 am:    我要安慰下自己........-.-" 愚子可教也.....   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:00 am:    Unstable voltage (usually a sudden increase in voltage) may cause damage to electrical appliances.(E.g. may damage the transformer)   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:01 am:    我係咪打錯字-.-?   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:02 am:    transformer is...? 係咪即係如果我地d voltage開得大會整到d solution變哂色咁解.....?   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:05 am:    Transformer is '火牛'   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:05 am:    如果佢叫你計N既oxidation number.. 而佢又contains兩N.. 咁係咪會叫你遂個計~~?   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:06 am:    oic......^^"   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:07 am:    Yes, if it is NH4NO3; No, in most of the other cases.   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:09 am:    可唔可以舉d例子呀...麻煩呀sir^^"   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:16 am:    點解要用mercury做cathode.. or起咩情況之下要用到mercury?   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:16 am:    yan~~have not open mobil ar?? no.?   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:18 am:    我開左.. my mobile phone no? is 94460387   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:21 am:    睇黎chio sir已經leave左..   Sapphire Username: 991097 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:22 am:    I leave la!! I call u ar!!   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:22 am:    N2, N = 0 N2H4, N = -2 N2O3, N = +3 You try this one : N2O5   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:25 am:    it's = +5 ? @_@~ thank you very much, sir.   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:29 am:    A circulating mercury cathode can carry the sodium away from the electrolytic cell to another chamber in which sodium reacts with water to give hydrogen gas and sodium hydroxide. Without a circulating mercury cathode, the sodium chloride solution in the electrolytic cell will change to sodium hydroxide which then will react directly with the chlorine formed at the anode. This reaction is not desirable because chlorine can no longer be used to make other useful substances such as PVC.   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:31 am:    The total no. of post has exceeded 600. I have to leave now. Take care and sleep well. Bye!   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:32 am:    我唔係好明...sorry...   Chio U Kim Username: cuk Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:39 am:    The main purpose of using a circulating mercury electrode is to separate the three products (chlorine gas, hydrogen gas and sodium hydroxide solution) obtained from the electrolysis of brine. If they are not separated from one another(this happens in the absence of a mercury electrode), they can neither be obtained in pure forms nor be used to make other useful substances. Refer to Chem 2000 Bk 1B p. 68 Fig. 11.17 for the uses of the three products.   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 02:42 am:    唔該哂你呀...chio sir...~   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 05:13 am:    祝大家UT成功=_=   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 09:42 am:    真係勁呀你地..=.=" 唔係真係冇訓過呀???? 考成點呀..講我知..   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 08:17 pm:    真係冇訓過呀... 仲去左麥記食早餐-.-v 但係溫左成既都係得個吉囉我... 好down囉...=.=   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Saturday, May 17, 2003 - 09:43 pm:    老實講句.. 臨急抱佛腳.. 結果係點都預左ga la...   咱們努力吧... yan~* Username: 991160 Registered: 04-2003 Posted on Sunday, May 18, 2003 - 01:30 pm:    我第一次用成個星期去準備.. I really put much efford on that.. 不過我盡左力已經足夠.. 縱使真係有d失望..   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Sunday, May 18, 2003 - 01:41 pm:    下次再努力過la~ 肥ja ma.. 又唔係咩大問題...   付出≠收獲... yan~* Username: 991160 Registered: 04-2003 Posted on Sunday, May 18, 2003 - 11:58 pm:    下次努力過呢一句我同意.. 但係我覺得我自己唔可以再肥了...   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Monday, May 19, 2003 - 07:13 am:    我見到你個名好想笑..... 你的付出同其他人俾可以只係微不足道... 如果你的收穫等如人地.. 咁咪好唔公平? 過左去就算la... 睇你都係sad一排跟住就咩都唔記得晒ga la... 咪話我睇死你=.="~   小畫家 Username: 981039 Registered: 04-2003 Posted on Monday, May 19, 2003 - 09:51 am:    付出左未必會有收獲, 唔付出一定唔會有收獲.   Yan Username: 991160 Registered: 04-2003 Posted on Monday, May 19, 2003 - 03:10 pm:    當你真係盡心盡力去做一樣野.. 但係你得到既竟然比果D坐享其成既人少.. 呢D仲要唔係一次半次..所以我真係失望.. 不過知道既係..就好�ü小畫家所講.. 付出唔一定有收獲, 但係你唔付出就一定得唔到任何野. 我好同意架..所以我知我自己唔應該放棄..   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Monday, May 19, 2003 - 08:17 pm:    總之唔好放棄...總力就得la... 問心無愧~   沾沾自喜中~~Sapphire Username: 991097 Registered: 04-2003 Posted on Monday, May 19, 2003 - 09:12 pm:    Hoh~~ 我識做份UT ar!!   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Monday, May 19, 2003 - 09:17 pm:    ....... 你會考個陣時試下咁講丫.. 睇下你點俾人打~~~   沾沾自喜中~~Sapphire Username: 991097 Registered: 04-2003 Posted on Monday, May 19, 2003 - 09:18 pm:    好驚ar~~ 今年會考深唔深ar??!   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Monday, May 19, 2003 - 09:25 pm:    你�ü邊科?   沾沾自喜中~~Sapphire Username: 991097 Registered: 04-2003 Posted on Monday, May 19, 2003 - 09:33 pm:    Chem,Phy, BIo ar~~   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Monday, May 19, 2003 - 09:43 pm:    chem就覺得普普通通囉...同之前差唔多.... phy有條火星唔識做>_<..都係同之前差唔多... bio就覺得幾易..有common senses同識吹水就得.... 不過..依d只係我feel... 通常成績出到黎會好差>.<... 跟住再睇solution就會發覺差好遠..�ü~   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Monday, May 19, 2003 - 09:47 pm:    今年最值得講的我諗係中文.... 今年中文好�ü好怪.. 同之前的有d唔同.. 首先係多左好多意見題.. 所以識吹水有著數... 二..唔好tip 題... �ü..題愈來愈難tip了... 也許都出呀今年... 好睬我課課都睇過下..唔係必死...~   沾沾自喜中~~Sapphire Username: 991097 Registered: 04-2003 Posted on Monday, May 19, 2003 - 09:47 pm:    火星同Phy有wt關係ar??!!   Ｈｉｎｇ∼ Username: 981909 Registered: 04-2003 Posted on Monday, May 19, 2003 - 10:01 pm:    火星的地心吸力.. 題目有個火箭之類的野降落係火星.. 總之我就覺得好難la... 可能其他人覺得易...=_=   努力中~~Sapphire Username: 991097 Registered: 04-2003 Posted on Tuesday, May 20, 2003 - 08:50 pm:    i c!!   皇家馬德里領隊~~~Alex ___ Username: 20021083 Registered: 04-2003 Posted on Sunday, May 25, 2003 - 08:29 pm:    點難法ar!!!   Real me Username: 991097 Registered: 04-2003 Posted on Thursday, June 12, 2003 - 08:48 pm:    Can anybody teach me how to write Full Equation ar???   991035 Username: 991035 Registered: 04-2003 Posted on Thursday, June 12, 2003 - 11:40 pm:    你 write which kind of the Equation 先?   Real me Username: 991097 Registered: 04-2003 Posted on Friday, June 13, 2003 - 07:53 pm:    acid   991035 Username: 991035 Registered: 04-2003 Posted on Sunday, June 15, 2003 - 01:11 pm:    咁都要講邊隻acid ga ma   Real me Username: 991097 Registered: 04-2003 Posted on Sunday, June 15, 2003 - 06:38 pm:    H2SO4   991035 Username: 991035 Registered: 04-2003 Posted on Sunday, June 15, 2003 - 06:53 pm:    conc. 就係 Mg(s)+ 2H2SO4(l)-------> MgSO4(aq)+SO2(g)+2H2O(l) dil. 就係 Mg(s)+ H2SO4(aq)--------> MgSO4(aq)+H2(g)   Real me Username: 991097 Registered: 04-2003 Posted on Monday, June 16, 2003 - 02:29 pm:    But why la!??   991035 Username: 991035 Registered: 04-2003 Posted on Monday, June 16, 2003 - 11:17 pm:    can you tell me who you are?   Real me Username: 991097 Registered: 04-2003 Posted on Wednesday, June 18, 2003 - 06:39 pm:    can you tell me too la??!   991035 Username: 991035 Registered: 04-2003 Posted on Wednesday, June 18, 2003 - 07:06 pm:    I am in 4B.....................................   Real me Username: 991097 Registered: 04-2003 Posted on Friday, June 20, 2003 - 02:20 pm:    me 2 la~~   眼淚 Username: 991160 Registered: 04-2003 Posted on Sunday, June 22, 2003 - 01:55 pm:    me 3 wor...~   991035 Username: 991035 Registered: 04-2003 Posted on Sunday, June 22, 2003 - 05:02 pm:    咁你係男定女呀? 講me 3o個個   Real me Username: 991097 Registered: 04-2003 Posted on Monday, June 23, 2003 - 09:03 pm:    991035 is LEE KAM WA, right??   眼淚 Username: 991160 Registered: 04-2003 Posted on Tuesday, June 24, 2003 - 08:18 pm:    我想問其實polar bond洗唔洗讀呢~? re:991035 我係邊個又有咩關係喎~ 唔該唔好起呢度問埋D咁無聊既問題啦~ 我開呢一個post係用黎問chem既問題架唔該~   小布丁 Username: 991097 Registered: 04-2003 Posted on Tuesday, June 24, 2003 - 11:31 pm:    991160: good~~   眼淚 Username: 991160 Registered: 04-2003 Posted on Sunday, June 29, 2003 - 12:03 am:    =.=v polar bond其實hkcee會唔會考到~?   991111 Username: 991111 Registered: 04-2003 Posted on Monday, July 28, 2003 - 11:39 am:    我想問返好耐之前問題.. iron(III)chloride可唔可唔係yellow ga? 如果佢冇講,咁iron(III)chloride可以係solid 如果係solid咁佢係咪唔會係yellow ga?   Chio U Kim Username: cuk Registered: 04-2003 Posted on Monday, July 28, 2003 - 01:53 pm:    FeCl3(aq) is yellow FeCl3(s) is brown