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Author Topic: Chemistry Urgent  (Read 2774 times)

nid404

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Re: Chemistry Urgent
« Reply #15 on: June 11, 2009, 05:49:40 pm »
Quote from: zainy on June 11, 2009, 05:44:23 pm
ya i did do it but umm hw do u know wether its 105.5 or 85.5  ???

the rest i gt !

the boiling point of the liquid is lesser than that of water...so it has to be less than 100

plz read the questions carefully...this is how we tend to make mistakes
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Offline Zain-Xa

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Re: Chemistry Urgent
« Reply #16 on: June 11, 2009, 05:51:26 pm »
Quote from: nid404 on June 11, 2009, 05:49:40 pm
Quote from: zainy on June 11, 2009, 05:44:23 pm
ya i did do it but umm hw do u know wether its 105.5 or 85.5  ???

the rest i gt !

the boiling point of the liquid is lesser than that of water...so it has to be less than 100

plz read the questions carefully...this is how we tend to make mistakes

ohk ya nd i know i make mistakes b/c i dnt read properly  :-[
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Offline VIP_93

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Re: Chemistry Urgent
« Reply #17 on: June 11, 2009, 07:49:18 pm »
can any 1 plz post chemistry past papers from 93 _ 95 and their mark scheme.

thanx in advance
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Offline aquarian93

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Re: Chemistry Urgent
« Reply #18 on: June 12, 2009, 01:50:10 am »
which salts are soluble in acids and which salts react with acids? ???
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Offline aquarian93

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Re: Chemistry Urgent
« Reply #19 on: June 12, 2009, 01:56:38 am »
cn anyone pls help me?
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Offline Summer :]

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Re: Chemistry Urgent
« Reply #20 on: June 12, 2009, 04:12:56 am »
Quote from: aquarian93 on June 12, 2009, 01:50:10 am
which salts are soluble in acids and which salts react with acids? ???

Well, for example:
HCl will be able to displace HNO3 from a nitrate salt, but HNO3 will not be able to displace the stronger HCl from a chloride salt.

another example,
HNO3 is more reactive than sulphuric acid, so HNO3 will displace a sulphate salt

Also...
CuCO3 (contains carbonic acid which is a very weak acid) + H2SO4 --> CuSO4 + H2O + CO2

It depends on the strong acidity of the acids reacted
About which salts are soluble inside, calm down that is not necessary in IGCSE i guess :P~
just learn the basic insoluble and soluble salts  ;D
good luck
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