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2016 AQA GCSE Chemistry Unofficial mark scheme 2016

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Reply 320
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z_o_e
11
I Smashed the exam!!!

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Reply 321
Avatar for Mlb37
Mlb37
6
I reckon the boundaries will be pretty high, that paper seemed quite easy to me

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Reply 322
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srmed
2
Original post by Zeeyo
it was pressure not catalyst


I'm pretty sure it's not pressure
Reply 323
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Eddiz7
1
Original post by romansholiday
I did this too, like I wrote Fe with a little 2 on the end and balanced from there, wtf :frown:



http://www.webqc.org/balance.php?reaction=Fe2O3+%2B+C+%3D+Fe2+%2B+CO2 This website says that the balanced equation is 2 Fe2O3 + 3 C = 2 Fe2 + 3 CO2
Original post by Cakes717
At the lowest I've got 52/60. What grade do you think that is?


A*. Definite.
Does any one have any suggestions for the grade boundaries ? :smile:
Original post by LiamCollins
For the advantage of ethene and steam can I say that it produces pure ethene so less is needed to be produced?


No, ethene is hydrated with steam to produce ethanol. However this is impure and needs to be distilled to remove the impurities
Anyone think it was hard?
Would mentioning that you can make margarine and having a longer shelf life be two marks for the last question?
Original post by srmed
Was the two conditions for cracking: high temperature and hot catalyst


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Original post by FitzpatrickR
Yh thats right


For the two conditions I think I may have over explained???? I stated the two methods that can be used. This is mentioned in the AQA Revision guide aswell.

This was my answer:

1 - Passing hot hydrocarbon vapours over a hot catalyst
2 - Reacting hydrocarbon vapours with steam at a high temperature (approx 800C)

Would I get the marks???
Original post by ScienceFantatic
Question 1

( +1), electrons( -1), neutron is uncharged( 3 marks)- not sure if it was in the nucleus or just the atom overall



It was just the nucleus, because it said about part 'Z', and that's all it wanted, not the whole atom. The way you have written the answer doesn't make it very clear though, it should be something like this

Protons (+1)
Neutrons (0)
Original post by TheDragonGuy
It was just the nucleus, because it said about part 'Z', and that's all it wanted, not the whole atom. The way you have written the answer doesn't make it very clear though, it should be something like this

Protons (+1)
Neutrons (0)


I said protons have +1 charge and neutrons are netural and thus have zero charge. I then stated the relative masses (proton and neutron both have relative mass of 1). I also included about the electrons e.g. -1 charge, but I clearly mentioned that the electrons are not in Z (the nucleus) labelled in Figure 1.
Original post by TheKillingTorch
A*. Definite.


Woo🤗
What are we thinking 33/34? Grade wise
Reply 334
Avatar for homere
homere
6
Original post by Mlb37
I reckon the boundaries will be pretty high, that paper seemed quite easy to me

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yes probably 55/60 for an A*
Reply 335
Avatar for z_o_e
z_o_e
11
Original post by Nathan Emmings
What are we thinking 33/34? Grade wise


B

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Reply 336
Avatar for z_o_e
z_o_e
11
Original post by guy321
For the two conditions I think I may have over explained???? I stated the two methods that can be used. This is mentioned in the AQA Revision guide aswell.

This was my answer:

1 - Passing hot hydrocarbon vapours over a hot catalyst
2 - Reacting hydrocarbon vapours with steam at a high temperature (approx 800C)

Would I get the marks???


Of course! !!!

I said
-catalyst
-high temperature or something vapours I think.

I think I'll get 1

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Did anyone know the black substance???
2 questions
what would 49/50 be
is saying that margarine can be made and it has a longer shelf life correct for the last 5 marker (I explained hydrogenation correctly)
I thought for the first question you would write the number of protons and neutrons in the atom of boron as well???- that's what I did anywhoo

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