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Author Topic: Chem paper 3 help!!  (Read 3478 times)

Offline thukon

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Chem paper 3 help!!
« on: May 28, 2009, 04:08:42 am »
Just generally, what tests do we need to learn? Like test for sulphur dioxide other ones?

And does anyone know a chem guide website? I already know chemguide.co.uk, but thats mostly for A levels.
« Last Edit: May 28, 2009, 04:12:14 am by thukon »
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Offline jkiam11

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Re: Chem paper 3 help!!
« Reply #1 on: May 28, 2009, 04:15:29 am »
You need to know basic tests such as oxygen and hydrogen tests and also tests for soluble ions such as zinc ion and copper ions.
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Offline thukon

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Re: Chem paper 3 help!!
« Reply #2 on: May 28, 2009, 04:17:28 am »
Yes but sometimes they ask tests fro random gases like sulphur dioxide. And what catalysts do we need to know? Like for decomposition of hydrogen peroxide and what else?
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Offline jkiam11

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Re: Chem paper 3 help!!
« Reply #3 on: May 28, 2009, 04:25:02 am »
Which paper did they ask you to test a random gas? There is nothing about identifying sulphur dioxide in the syllabus.
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Offline thukon

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Re: Chem paper 3 help!!
« Reply #4 on: May 28, 2009, 04:47:43 am »
Quote from: jkiam11 on May 28, 2009, 04:25:02 am
Which paper did they ask you to test a random gas? There is nothing about identifying sulphur dioxide in the syllabus.
Yes well theres nothing about knowing hydrogen peroxides catalyst in the syllabus either. And it came in paper 6.
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Offline jkiam11

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Re: Chem paper 3 help!!
« Reply #5 on: May 28, 2009, 05:00:59 am »
I didn't do paper 6 so I wouldn't know but was your question abt hydrogen peroxides a suggest or deduce question?
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Offline chaosking

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Re: Chem paper 3 help!!
« Reply #6 on: May 28, 2009, 06:14:39 am »
check the syllabus
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Offline Shogun

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Re: Chem paper 3 help!!
« Reply #7 on: May 28, 2009, 07:37:53 am »
u gotta learn test of cations(zinc,aluminium,copper(II),calcium.iron(II),iron(III),ammonium,etc) and test of anioins(nitrates,carbonates,sulphates,chlorides,etc) and test of gasses(oxygen,hydrogen,carbon dioxide,chlorine and ammonia)
then u gotta learn how to test unsaturated hydrocarbon(with double bonds eg:ethene) where u have to use aqueous redish-brown bromine water which decolourizes when added to unsaturated hydrocarbon..

and thts all i guess
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Offline ~M.J~

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Re: Chem paper 3 help!!
« Reply #8 on: May 28, 2009, 07:38:17 am »
TEST FOR SULPHUR DIOXIDE?
that can come
my teacher gave it in our mocks
answer??
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Offline Shogun

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Re: Chem paper 3 help!!
« Reply #9 on: May 28, 2009, 07:39:55 am »
@mj wat was the test for sulphur dioxide?
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Offline ~M.J~

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Re: Chem paper 3 help!!
« Reply #10 on: May 28, 2009, 07:41:47 am »
Got it wrong in the exams!  ;D
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Offline Shogun

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Re: Chem paper 3 help!!
« Reply #11 on: May 28, 2009, 07:43:15 am »
i dont think there was any test for so2 cuz we never came across it or maybe we did,ijust forgot
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one who masters both the pen and paper is indeed a true warrior.

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Offline godfather93

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Re: Chem paper 3 help!!
« Reply #12 on: May 28, 2009, 07:45:53 am »
sulphur dioxide turns acidified potassium dichromate from orange to green.
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Offline ~M.J~

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Re: Chem paper 3 help!!
« Reply #13 on: May 28, 2009, 07:47:08 am »
Thanx 4 the answer
but may i ask in which chapter is that in!....
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Offline godfather93

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Re: Chem paper 3 help!!
« Reply #14 on: May 28, 2009, 07:48:42 am »
Quote from: ~M.J~ on May 28, 2009, 07:47:08 am
Thanx 4 the answer
but may i ask in which chapter is that in!....
in my book it's not in a chapter but all the gas tests r given at the end of the book.
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