|
|
发表于 20-1-2010 09:05 PM
|
显示全部楼层
"还有那个supersaturated solution是指原本你溶1g X的solute
结果溶进solvent里面的这个Xsolute却超过了1g ...
四月一日的小皮 发表于 20-1-2010 08:34 PM 
那么多过5g的X溶进去solvent里面会有什么事情发生？ |
|
|
|
|
|
|
|
|
|
|
|
发表于 20-1-2010 09:16 PM
|
显示全部楼层
|
it may cause some physical properties of the solvent change,like temperature(like boiling pointand other factors. |
|
|
|
|
|
|
|
|
|
|
|
发表于 20-1-2010 09:42 PM
|
显示全部楼层
it may cause some physical properties of the solvent change,like temperature(like boiling pointand o ...
四月一日的小皮 发表于 20-1-2010 09:16 PM
那你说的那个rate of vaporization也会有影响？
还有可以解释下vapor pressure吗？ |
|
|
|
|
|
|
|
|
|
|
|
发表于 21-1-2010 10:04 AM
|
显示全部楼层
对，rate of vapourisation，又称rate of evaporation，也会有影响，但是没有那么significant。
Vapor pressure or equilibrium vapor pressure is the pressure of a vapor in thermodynamic equilibrium with its condensed phases in a closed container.
All liquids and solids have a tendency to evaporate into a gaseous form, and all gases have a tendency to condense back to their liquid or solid form.
(From Wikipedia, the free encyclopedia)
=====>
vapour（gaseous）particles that lie in vapor phase (above the liquid phase)will collide to the wall of the container., which exert force to a partcular area on the wall of container,producing presure.
This pressure is known as vapour pressure. |
|
|
|
|
|
|
|
|
|
|
|
发表于 21-1-2010 10:22 AM
|
显示全部楼层
对，rate of vapourisation，又称rate of evaporation，也会有影响，但是没有那么significant。
Vapor p ...
四月一日的小皮 发表于 21-1-2010 10:04 AM
噢噢噢
大概明白了
Molar heat of vaporization/fusion=latent heat of vaporization/fusion,right?
By using the kinetic molecular theory of gases to explain the fact below:
The gas molecules move under a very high velocity (almost 3km per second) in room temperature, but the rate of diffusion is very slow.
HgCl2 has a solubility of 6g/100g water at 18C and 25g/100g water at 78C.
If cool down the temperature of saturated solution of HgCl2 from 78C to 18C,
We can get 38g solid crystal of HgCl2.
Then what is the mass of the original saturated solution of HgCl2 that we used to cool down and get the solid crystal of HgCl2? |
|
|
|
|
|
|
|
|
|
|
|
发表于 22-1-2010 11:20 PM
|
显示全部楼层
你有照片可以让我看的嘛？
Lov瑜瑜4ever 发表于 19-1-2010 05:29 PM
加我msn。我不会post上来～
橙色书皮 |
|
|
|
|
|
|
|
|
|
|
|
发表于 24-1-2010 02:39 PM
|
显示全部楼层
在那个mass spectrometer里，
degree of deflection is independent on the velocity of ion.
why? |
|
|
|
|
|
|
|
|
|
|
|
发表于 1-2-2010 12:10 PM
|
显示全部楼层
回复 462# 语曦
I participated last year for SPM lvl de and got high distinction |
|
|
|
|
|
|
|
|
|
|
|
发表于 1-2-2010 12:28 PM
|
显示全部楼层
|
|
|
|
|
|
|
|
|
|
|
发表于 4-2-2010 12:43 PM
|
显示全部楼层
在那个mass spectrometer里，
degree of deflection is independent on the velocity of ion.
why?
Lov瑜瑜4ever 发表于 24-1-2010 02:39 PM 
because in be4, at accerelation phase,the ion is accelerated to a constant velocity.
The deflection is now depend on mass and charge of the ion. |
|
|
|
|
|
|
|
|
|
|
|
发表于 4-2-2010 12:43 PM
|
显示全部楼层
回复 语曦
I participated last year for SPM lvl de and got high distinction
vick5821 发表于 1-2-2010 12:10 PM
got wat mark???got 90 above? |
|
|
|
|
|
|
|
|
|
|
|
发表于 4-2-2010 12:54 PM
|
显示全部楼层
噢噢噢
大概明白了
Molar heat of vaporization/fusion=latent heat of vaporization/fusion,rig ...
Lov瑜瑜4ever 发表于 21-1-2010 10:22 AM
不懂对不对，先给我答案，看我对不对。xD |
|
|
|
|
|
|
|
|
|
|
|
发表于 4-2-2010 02:27 PM
|
显示全部楼层
回复 511# 四月一日的小皮
82.5..very cha lo |
|
|
|
|
|
|
|
|
|
|
|
发表于 4-2-2010 02:56 PM
|
显示全部楼层
回复 513# vick5821
ok mah...still need push hard in Advanced lvl. |
|
|
|
|
|
|
|
|
|
|
|
发表于 4-2-2010 03:08 PM
|
显示全部楼层
|
|
|
|
|
|
|
|
|
|
|
发表于 4-2-2010 03:17 PM
|
显示全部楼层
|
finish liao lor....last yr batch.xD |
|
|
|
|
|
|
|
|
|
|
|
发表于 4-2-2010 03:24 PM
|
显示全部楼层
不懂对不对，先给我答案，看我对不对。xD
四月一日的小皮 发表于 4-2-2010 12:54 PM
不好意思哦
我的书本里面没有答案了==
我好象连做都做不到
你这么久才来回答
我都跑去读BIO了咯
哈哈
你STPM有拿BIO的哦？ |
|
|
|
|
|
|
|
|
|
|
|
发表于 4-2-2010 03:27 PM
|
显示全部楼层
|
|
|
|
|
|
|
|
|
|
|
发表于 4-2-2010 03:31 PM
|
显示全部楼层
回复 518# 四月一日的小皮
可以给我你MSN？？ |
|
|
|
|
|
|
|
|
|
|
|
发表于 4-2-2010 03:31 PM
|
显示全部楼层
回复 517# Lov瑜瑜4ever
你也是start to study f6 stuff 了？ |
|
|
|
|
|
|
|
|
|
| |
 本周最热论坛帖子
|
961 
26
