AQA GCSE Chemistry Unit 2 24 May 2012
Chemistry exam discussion - share revision tips in preparation for GCSE, A Level and other chemistry exams and discuss how they went afterwards.
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Re: AQA GCSE Chemistry Unit 2 24 May 2012same(Original post by grangran1234)
Yeah for the tick question I put hydrogen is less reactive.
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Re: AQA GCSE Chemistry Unit 2 24 May 2012The one about pressure was why dont the manufactorers increase the pressure to above (really high number)?(Original post by tssf_skye)
I can't remember the questions exactly, but what did everyone write for the stuff on ammonia?
There was one about the yield and pressure.. i can't really remember haha -
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Re: AQA GCSE Chemistry Unit 2 24 May 2012I completely dissagree! I found the jan mock very very easy and got and A and this very hard and Im thinking ill get a C from it(Original post by osama2)
guys please, you have to admit that this was the easiest exam out of all of the past papers. in january 2010 the boundary was 38 for an A*. this was easier so i have a bad feeling.....maybe 39/40 for an A*. -
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Re: AQA GCSE Chemistry Unit 2 24 May 2012Yeah thats correct(Original post by osama2)
what did u put for the oxidation or something? i said losing electrons. reduction is gaining so i think i was right? -
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Re: AQA GCSE Chemistry Unit 2 24 May 2012The one about yield and pressure was. Why does increasing the pressure increase the yield? the answer is because there is more molecules of gas on the reactant side. . .(Original post by Chlomc)
The one about pressure was why dont the manufactorers increase the pressure to above (really high number)? -
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Re: AQA GCSE Chemistry Unit 2 24 May 2012Yeah I said that aswell(Original post by osama2)
what did u put for the oxidation or something? i said losing electrons. reduction is gaining so i think i was right?
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Re: AQA GCSE Chemistry Unit 2 24 May 2012Yes thats correct, its becuase there are more mjoles of products than there are of reactants and the increase in pressure prefers that so it produces a higher yield of reaction(Original post by Aidanb90)
The one about yield and pressure was. Why does increasing the pressure increase the yield? the answer is because there is more molecules of gas on the reactant side. . . -
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Re: AQA GCSE Chemistry Unit 2 24 May 2012i put it that the costs are low as sources are readily available, and that the reaction was fairly quick.(Original post by osama2)
what were the two reasons about that it doesnt matter if the yield is low?
not sure if its right though -
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Re: AQA GCSE Chemistry Unit 2 24 May 2012was this because a lot of energy is required so it is expensive?(Original post by Chlomc)
The one about pressure was why dont the manufactorers increase the pressure to above (really high number)?
