AQA CHEM1 ~ 10th January 2013 ~ Unofficial Mark Scheme

Original post by PoorLoser

if im being pessimistic, I will have gotten 60 marks according to this mark scheme.

What grade is that? Please tell me it's an A, I really don't want a B!

In January 2012, 60/70 was 92 UMS, a very comfortable A.

Reply 64

PoorLoser

2

Original post by SomePotential

In January 2012, 60/70 was 92 UMS, a very comfortable A.

but are these all of the answers? because there may be more i got wrong
and also jan 2012 has the lowest grade boundaries didn't it? do you think the grade boundaries for this one is lower? personally, this test was 100 times harder than the past papers :/

C3H6 or C4H8?

Original post by baker96

C3H6 or C4H8?

this is what i was thinking...
isn;t it shorter chain??

Reply 67

zohaib029

For your question with the answer as Zn. Wasn't there anything in the question mentioning its an ion. No one panic. Only I seem to remember this so it seems unlikely. This lead me to the answer of Ga. i accept i may be plain wrong. BTW thanks for spending your time to help piece this mark scheme together.

Reply 68

Original post by Ayesh123

What do you think 50/70 would be?

Pretty sure it would be a B.

Reply 69

Original post by PoorLoser

but are these all of the answers? because there may be more i got wrong
and also jan 2012 has the lowest grade boundaries didn't it? do you think the grade boundaries for this one is lower? personally, this test was 100 times harder than the past papers :/

I'm fairly sure I have included all the questions now, but the total marks is out of 74 (too generous in some mark allocations). However, irregardless of grade boundaries, 60 is an A. The highest ever grade boundary for A was 58/60, and this paper will likely have lower boundaries.

Reply 70

Lizzy96

Original post by baker96

C3H6 or C4H8?

I think they're both right depending on what your reason for choosing it was, I put C4H8 because it's easier to turn from gas to liquid as the boiling point is higher

Reply 71

Original post by zohaib029

For your question with the answer as Zn. Wasn't there anything in the question mentioning its an ion. No one panic. Only I seem to remember this so it seems unlikely. This lead me to the answer of Ga. i accept i may be plain wrong. BTW thanks for spending your time to help piece this mark scheme together.

Nop, you had the mass no. and the no. of neutrons.
Mass no. - no. of neutrons = proton no. = atomic = identity of element.
They just wanted the identity of it i guess, which was Zinc or Zn. I was a cheeky bugger and wrote the mass and atomic no. anyway :tongue:

Reply 72

Original post by SomePotential

I'm fairly sure I have included all the questions now, but the total marks is out of 74 (too generous in some mark allocations). However, irregardless of grade boundaries, 60 is an A. The highest ever grade boundary for A was 58/60, and this paper will likely have lower boundaries.

The total raw marks was out of 74?!? Isn't it usually 70?

Reply 73

Original post by zohaib029

For your question with the answer as Zn. Wasn't there anything in the question mentioning its an ion. No one panic. Only I seem to remember this so it seems unlikely. This lead me to the answer of Ga. i accept i may be plain wrong. BTW thanks for spending your time to help piece this mark scheme together.

Nope, fairly certain there were no mention of ions in that question. The introduction to the question talked about isotopes and the question asked if an isotope with a mass number of 68 had 38 neutrons, what element is it. Seeing as no one else has mentioned it, you probably read it wrong. :frown:

Reply 74

Original post by UKBrahs

The total raw marks was out of 74?!? Isn't it usually 70?

It is out of 70, my mark scheme is out of 74. This is because I wasn't sure how many marks were allocated to each question and I ended up being generous on some of them.

Reply 75

Matbunny

1

According to the unofficial mark scheme I scored about 57-58 marks, do you think that would be an A or a B??

Posted from TSR Mobile

Reply 76

SuparNoob

5

Original post by SomePotential

I've created a bit more finished mark scheme, but allocated marks quite generally. Currently, the mark scheme is out of 74. This mark scheme is not conclusive and may contain errors.

g. Write down the equation for the complete combustion of ethanethiol (CH₃CH₂SH). [2]

•

Correct equation - CH₃CH₂SH + 3.5O₂ -> 2CO₂ + 3H₂O + SO₂;

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Correctly balanced;

For this question, I count 9 oxygen atoms on the right (4 for 2CO2, 3 for 3H2O and 2 from SO2) and so it should be 4.5 O2 on the right hand side, not 3.5

Reply 77

Attz_09

f. Type of reaction between ammonia and nitric acid? [1]

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Neutralisation

would an endo thermic reation work please reply haha

i got 9 wrong being generous
what is my grade or predicted might be a B as paper was mostly easy

Reply 78