| Author |
Message |
    
991097
Username: 991097
Registered: 04-2003
| | Posted on Thursday, May 15, 2003 - 09:16 pm: | |
1. Why CCl4 cannot conduct electricity??
2. In the test, if it asked the flow dirrection of electricity, I should answer it is "from left to right" or "clock-wise" ar??
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981909
Username: 981909
Registered: 04-2003
| | Posted on Thursday, May 15, 2003 - 09:21 pm: | |
2.唔係答又邊支electrode去邊支electrode ga咩? |
991097
Username: 991097
Registered: 04-2003
| | Posted on Thursday, May 15, 2003 - 09:37 pm: | |
The direction ar!? |
981909
Username: 981909
Registered: 04-2003
| | Posted on Thursday, May 15, 2003 - 10:03 pm: | |
the current flow from electrode A to electrode B.....唔得咩 |
991097
Username: 991097
Registered: 04-2003
| | Posted on Thursday, May 15, 2003 - 10:24 pm: | |
But some people said in HKCEE have to use clock-wise or anti-clock-wise ar!! |
981909
Username: 981909
Registered: 04-2003
| | Posted on Thursday, May 15, 2003 - 10:29 pm: | |
傻la...我考完都未聽過d咁既野..
你表達到個意思就得ga la...
果個人好明顯玩緊你~ |
981909
Username: 981909
Registered: 04-2003
| | Posted on Thursday, May 15, 2003 - 10:29 pm: | |
而且都唔會問current ge..
多數都係問粒e-邊去邊ja ma.. |
991097
Username: 991097
Registered: 04-2003
| | Posted on Thursday, May 15, 2003 - 10:38 pm: | |
I see!!
Thanks la!! |
991097
Username: 991097
Registered: 04-2003
| | Posted on Thursday, May 15, 2003 - 10:41 pm: | |
I want to ask why we have to add dilute sulphuric acid when we do the electrolysis of water in a Hofmann voltameter?? |
981909
Username: 981909
Registered: 04-2003
| | Posted on Thursday, May 15, 2003 - 10:44 pm: | |
increase the electricity conductivity |
991097
Username: 991097
Registered: 04-2003
| | Posted on Thursday, May 15, 2003 - 10:46 pm: | |
Only water cannot ma?? |
981909
Username: 981909
Registered: 04-2003
| | Posted on Thursday, May 15, 2003 - 10:57 pm: | |
得..
不過有dilute sulphuric acid快d...
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991097
Username: 991097
Registered: 04-2003
| | Posted on Thursday, May 15, 2003 - 11:23 pm: | |
That means usually we add dilute sulphuric acid, but if not adding dilute sulphuric acid can also do this experiment ar??!! |
991035
Username: 991035
Registered: 04-2003
| | Posted on Friday, May 16, 2003 - 01:01 am: | |
of course not!
The conductivty of water is not suit to conduct electricity.
if you really want to do this experinment only with water,
the voltage should be turned to extremly high~
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981909
Username: 981909
Registered: 04-2003
| | Posted on Friday, May 16, 2003 - 09:29 am: | |
原來如此.. |
981909
Username: 981909
Registered: 04-2003
| | Posted on Friday, May 16, 2003 - 09:29 am: | |
Sorry ar
991097...
我chem好差.. |
991097
Username: 991097
Registered: 04-2003
| | Posted on Friday, May 16, 2003 - 04:57 pm: | |
never mind la!!
Thanks for your help ar!! (^o^) |