Mark Scheme (Results) June 2014 - Edexcel
Mark Scheme (Results) June 2014
International GCE Chemistry (6CH02/01R)
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Summer 2014 Publications Code US038315* All the material in this publication is copyright ? Pearson Education Ltd 2014
General Marking Guidance
All candidates must receive the same treatment. Examiners must
mark the first candidate in exactly the same way as they mark the
last.
Mark schemes should be applied positively. Candidates must be
rewarded for what they have shown they can do rather than
penalised for omissions.
Examiners should mark according to the mark scheme not according
to their perception of where the grade boundaries may lie.
There is no ceiling on achievement. All marks on the mark scheme
should be used appropriately.
All the marks on the mark scheme are designed to be awarded.
Examiners should always award full marks if deserved, i.e. if the
answer matches the mark scheme. Examiners should also be
prepared to award zero marks if the candidate's response is not
worthy of credit according to the mark scheme.
Where some judgement is required, mark schemes will provide the
principles by which marks will be awarded and exemplification may be
limited.
When examiners are in doubt regarding the application of the mark
scheme to a candidate's response, the team leader must be
consulted.
Crossed out work should be marked UNLESS the candidate has
replaced it with an alternative response.
Mark schemes will indicate within the table where, and which strands
of QWC, are being assessed. The strands are as follows:
i) ensure that text is legible and that spelling, punctuation and grammar are accurate so that meaning is clear ii) select and use a form and style of writing appropriate to purpose
and to complex subject matter
iii) organise information clearly and coherently, using specialist
vocabulary when appropriate
Using the Mark Scheme
Examiners should look for qualities to reward rather than faults to penalise. This does NOT mean giving credit for incorrect or inadequate answers, but it does mean allowing candidates to be rewarded for
answers showing correct application of principles and knowledge.
Examiners should therefore read carefully and consider every response:
even if it is not what is expected it may be worthy of credit.
The mark scheme gives examiners: an idea of the types of response expected
how individual marks are to be awarded the total mark for each question examples of responses that should NOT receive credit.
/ means that the responses are alternatives and either answer should
receive
full
credit.
( ) means that a phrase/word is not essential for the award of the mark,
but helps the examiner to get the sense of the expected answer.
Phrases/words in bold indicate that the meaning of the phrase or the
actual word is essential to the answer.
ecf/TE/cq (error carried forward) means that a wrong answer given in an
earlier part of a question is used correctly in answer to a later part of the
same question.
Candidates must make their meaning clear to the examiner to gain the mark. Make sure that the answer makes sense. Do not give credit for correct words/phrases which are put together in a meaningless manner. Answers must be in the correct context.
Quality of Written Communication Questions which involve the writing of continuous prose will expect candidates to:
write legibly, with accurate use of spelling, grammar and punctuation in order to make the meaning clear select and use a form and style of writing appropriate to purpose and to complex subject matter
organise information clearly and coherently, using specialist vocabulary when appropriate. Full marks will be awarded if the candidate has demonstrated the above abilities. Questions where QWC is likely to be particularly important are indicated (QWC) in the mark scheme, but this does not preclude others.
Section A (multiple choice)
Question Number
1(a)
Correct Answer D
Question Number
1(b)
Correct Answer B
Question Number
2
Correct Answer B
Question Number 3(a)
Correct Answer D
Question Number
3 (b)
Correct Answer D
Question Number
4
Correct Answer B
Question Number
5(a)
Correct Answer D
Question Number
5(b)
Correct Answer C
Question Number
6
Correct Answer A
Question Number
7
Correct Answer D
Question Number
8
Correct Answer B
Question Number
9
Correct Answer C
Reject Reject Reject Reject Reject Reject Reject Reject Reject Reject Reject Reject
Mark 1 Mark 1 Mark 1 Mark 1 Mark 1 Mark 1 Mark 1 Mark 1 Mark 1 Mark 1 Mark 1 Mark 1
6CH02_01R 1406
Question Number
10
Correct Answer C
Question Number
11
Correct Answer B
Question Number
12(a)
Correct Answer A
Question Number
12(b)
Correct Answer C
Question Number
13
Correct Answer A
Question Number
14
Correct Answer B
Question Number
15
Correct Answer D
Question Number
16
Correct Answer C
Reject
Mark 1
Reject
Mark
1
Reject
Mark
1
Reject
Mark
1
Reject
Mark
1
Reject
Mark
1
Reject
Mark
1
Reject
Mark
1
TOTAL FOR SECTION A = 20 MARKS
6CH02_01R 1406
Section B
Question Acceptable Answers Number 17 (a)
Reject
Mark 3
The correct number of dots and crosses around
both chromium atoms
(1) All the oxygen atoms to have the correct number of bonds and the lone pairs
(1)
The extra 2 electrons from the potassium on
the oxygen(s) (1)
Both * on the same
oxygen
Question Acceptable Answers Number
17 (b)(i) (n=14.71 ? 294.2 = ) 0.0500 (mol)
Reject (1)
(c= 0.0500 ? 0.25 = ) 0.200 (mol dm-3) (1) Allow TE on incorrect Mr value
Allow use of 294 Correct answer without working scores (2) Allow 1SF
If units are given then they must be correct
Mark 2
6CH02_01R 1406
Question Number
17 (b)(ii)
Acceptable Answers (0.00250 x 6 = ) 0.0150 (mol) (0.0150 x 166 = 2.49 (g))
Reject (1)
Mark 2
2.6 value 5.0 (g)
(1)
TE for suitable mass to use on incorrect calculation
Suitable mass must be between 0.10 g more than the calculated value but less than or equal to double the calculated value
Allow 1 SF for the suitable mass
Question Number
17 (b)(iii)
Acceptable Answers (0.00260 x 2 =) 0.00520 (mol)
Reject (1)
Mark 2
(V=0.00520 ? 0.16 x 1000 =) 32.5 (cm3) / 0.0325 dm3 (1)
Allow answer without working
(2)
Volume must be at least 3 SF
Question Number
17 (b)(iv)
Acceptable Answers
Reject
Percentage error large with a small mass/
Just
Mass is only to 1 SF
(1) `mass is not
accurate'
Mark 2
Reference to concentration.
No repeats possible
(1)
6CH02_01R 1406
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