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楼主 |
发表于 26-11-2011 11:04 PM
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回复 20# devilfromheaven
 zomo酱辛苦哦？其实很容易的
diffUsion - movement of particles from high concentration to lower concentration 而已。。。
例子
GAS
( GAS JAR ）
1 . few drops of bromine water is dropped into a gar jar .
2. gas jar is tutup with jar cover
3. another gas jar is placed upside down on the top of gas jar.
4 gas jar cover is removed . The time taken for colour changed is recorded.
Observation
reddish brown colour bromine gas spreads through out the another gas jar in few seconds.
Explanation
the bromine particles entered the spaces between the particles of the air。
liquid的话用potassium maganate
把它丢进水，水变purple。。 |
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发表于 26-11-2011 11:10 PM
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楼主 |
发表于 26-11-2011 11:11 PM
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来natphalene。。。
heating of natphalene - temperature constant ( heat supplied is used to overcome the force of attraction btwn the particles)
cooling of natphalene - temperature constant( heat realeased by particle is equal with heat lost to the surrrounding to change liquid to solid state) |
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楼主 |
发表于 26-11-2011 11:13 PM
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回复 22# devilfromheaven
明天到你问我。。晚安 |
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发表于 26-11-2011 11:13 PM
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回复 23# 金在囧
precaution~~
to avoid super cooling...
must stir the water to ensure even heating... |
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发表于 26-11-2011 11:13 PM
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发表于 27-11-2011 01:02 AM
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这个不错哦，都是些很热门的topic。
Rusting of iron nail (compare with steel and stainless steel) 也是很热门的，一定要读！！
加油！  |
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楼主 |
发表于 27-11-2011 08:06 AM
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回复 27# killocc
 谢谢你的提醒。。。
rate of reaction , redox 也很重要 |
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