Official AQA GCSE Chemistry Unit 2 24th Janurary NEW SPEC Watch

Poll: What do you think the 6 marker will be?
Electrolysis of (metal) (14)
22.95%
Gas chromotography and Mass spectrometry (19)
31.15%
Atomic structure and bonding (5)
8.2%
Polymers (10)
16.39%
Explaining the process of a experiment (8)
13.11%
Other (please leave your suggestion) (5)
8.2%
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zohim
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#141
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#141
(Original post by sykik)
What did you put for why do they heat stage 1?
the heat was used to speed up the reaction and allow the particles to have activitation energy so they can collide.
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zohim
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#142
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#142
(Original post by Davothebigafro)
The only one i'm unsure about is 'why cant scientists answer this question' about the kelp,give 2 reasons
It is a opinioniated based question where you require a persons point of view and there may be social and ethical factors which may influence this. 2 marks right there
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grammar12
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#143
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#143
For all those who said that the exam was easy our head of chemistry said that the ums would be low around 45 for an a* because there were many questions that weren't obvious and required deeper thought in addition to the fact that he himself (phd in chemistry) got 3 questions wrong (proven by textbook). The exam was ok for me but everyone feels like they did badly. I'm just lucky I revised everything in the paper


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Davothebigafro
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#144
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#144
(Original post by grammar12)
For all those who said that the exam was easy our head of chemistry said that the ums would be low around 45 for an a* because there were many questions that weren't obvious and required deeper thought in addition to the fact that he himself (phd in chemistry) got 3 questions wrong (proven by textbook). The exam was ok for me but everyone feels like they did badly. I'm just lucky I revised everything in the paper


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Hmm, really? which questions did he get wrong?
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grammar12
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#145
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#145
The question on ion formula of the solution thing. The question on the precipitate and he made a calculating error in the final question that should've been 32.5 g maximum mass and the percentage was therefore wrong. But he did say that this is the hardest he's seen so all you could be in for 100ums!


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Rohan97
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#146
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#146
For the first question would "The reaction produces products which make the solution cloudy" get a mark?
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grammar12
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#147
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#147
It creates a precipitate


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sykik
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#148
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#148
what was the answer for the last question, the maximum mass one?
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ali_d123
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#149
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#149
(Original post by sykik)
what was the answer for the last question, the maximum mass one?
32.5g
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MajorRisk
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#150
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#150
(Original post by grammar12)
The question on ion formula of the solution thing. The question on the precipitate and he made a calculating error in the final question that should've been 32.5 g maximum mass and the percentage was therefore wrong. But he did say that this is the hardest he's seen so all you could be in for 100ums!


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Just because he made a calculating error doesn't mean it was hard - cause we all make em I bet he calculated that 2FeCl3 as 2 lots of Iron and 3 Chlorine instead of 2 iron 6 Chlorine....a lot of people I spoke to made that mistake.

I think as long as you do the calculations for % yield right, you'll still get marks. Anyway, in most respects the harder papers (with Low UMS boundaries) are the easiest to do well in. I hope you teacher is right because of that...
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Davothebigafro
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#151
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#151
in the electrolysis of sodium iodide, was hydrogen gas formed at the cathode??
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sykik
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#152
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#152
(Original post by ali_d123)
32.5g
Was it really, didnt they give you the Mr for the whole fecl3 or did they give seperate for fe and cl3
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MajorRisk
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#153
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#153
(Original post by Davothebigafro)
in the electrolysis of sodium iodide, was hydrogen gas formed at the cathode??
Yeah, cause it is less reactive than sodium, and the more reactive ions stay in the solution. (Also Hydrogen is H+ so thats why it forms at Negative electrode - not sure if that'll be a mark, cause it was a 2 marker I think...
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sykik
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#154
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#154
didn't the question give you the Mr for the whole fecl3 or did they give seperate for fe and cl3
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sykik
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#155
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#155
(Original post by sykik)
didn't the question give you the Mr for the whole fecl3 or did they give seperate for fe and cl3
someone plaese answer this
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MajorRisk
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#156
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#156
(Original post by sykik)
Was it really, didnt they give you the Mr for the whole fecl3 or did they give seperate for fe and cl3
All they gave you was formula, and Mr of Fe (56) and Mr of Cl (35.5)

You had to work out Mr of 2FeCl3 which was 325. Then divide by Mr of 2Fe which was 112, and then times that by 11.2g which gave you 32.5g.

It was easy to spot the ratio between 112 (Mr) and 11.2 (g) which explains why the answer was 32.5g because the Mr was 325. (Just 10 times bigger)
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sykik
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#157
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#157
(Original post by MajorRisk)
You had to work out Mr of 2FeCl3 which was 325. Then divide by Mr of 2Fe which was 112, and then times that by 11.2g which gave you 32.5g.

It was easy to spot the ratio between 112 (Mr) and 11.2 (g) which explains why the answer was 32.5g because the Mr was 325. (Just 10 times bigger)
Yh but i thought they gave you the Mr for FeCL3 in the question
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MajorRisk
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#158
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#158
(Original post by sykik)
Yh but i thought they gave you the Mr for FeCL3 in the question
If they did - i must have missed it, but it sounds like 32.5 is correct.

What did you get for it?
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sykik
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#159
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#159
i got 18.something
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ali_d123
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#160
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#160
(Original post by sykik)
i got 18.something
you went wrong. i noticed the answer after seeing that it was 10 times bigger.
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