| Author | Message | ||
     981099 Username: 981099 Registered: 04-2003 |
1)the element in the same group of periodic table have similar physical property ? 2)the reaction between methane & bromine under light is violent ? 3) soapless detergent is acidic ? | ||
| Chio U Kim Username: cuk Registered: 04-2003 |
1) elements in the same group exhibit similar chemical properties but not physical properties. Consider the elements in group VII(halogens), they all react with sodium by gaining one electron per atom to give sodium halides (i.e. similar chemical reactions/chemical properties) Cl2 + 2Na ® 2Na+Cl- Br2 + 2Na ® 2Na+Br- I2 + 2Na ® 2Na+I- However, they are in different physical states at room temperature and pressure. Cl2 is a gas Br2 is a liquid I2 is a solid | ||
| Chio U Kim Username: cuk Registered: 04-2003 |
2) It is a moderate reaction (Not too fast nor slow) 3) Yes. But note that soapy detergent or soap is alkaline. |