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Aqa Chemistry 2010 Essay

2717 words - 11 pages

Version: 10/08/2012

General Certificate of Secondary
Education

Additional Science 4408 /
Chemistry 4402

CH2HP

Unit Chemistry 2

Mark Scheme
2012 examination – June series

Mark schemes are prepared by the Principal Examiner and considered, together with the
relevant questions, by a panel of subject teachers. This mark scheme includes any
amendments made at the standardisation meeting attended by all examiners and is the scheme
which was used by them in this examination. The standardisation meeting ensures that the
mark scheme covers the students’ responses to questions and that every examiner
understands and applies it in the same correct way. As preparation for the standardisation ...view middle of the document...

Set and published by the Assessment and Qualifications Alliance.

The Assessment and Qualifications Alliance (AQA) is a company limited by guarantee registered in England and Wales (company number 3644723) and a registered charity (registered charity number 1073334).
Registered address: AQA, Devas Street, Manchester M15 6EX

Additional Science / Chemistry – AQA GCSE Mark Scheme 2012 June series

MARK SCHEME
Information to Examiners

1.

General
The mark scheme for each question shows:



the marks available for each part of the question
the total marks available for the question
the typical answer or answers which are expected
extra information to help the Examiner make his or her judgement and help to
delineate what is acceptable or not worthy of credit or, in discursive answers, to give
an overview of the area in which a mark or marks may be awarded.

The extra information is aligned to the appropriate answer in the left-hand part of the
mark scheme and should only be applied to that item in the mark scheme.
At the beginning of a part of a question a reminder may be given, for example:
where consequential marking needs to be considered in a calculation;
or the answer may be on the diagram or at a different place on the script.
In general the right hand side of the mark scheme is there to provide those extra details
which confuse the main part of the mark scheme yet may be helpful in ensuring that
marking is straightforward and consistent.
2.

Emboldening
2.1

2.2

A bold and is used to indicate that both parts of the answer are required to award
the mark.

2.3

3.

In a list of acceptable answers where more than one mark is available ‘any two
from’ is used, with the number of marks emboldened. Each of the following lines
is a potential mark.

Alternative answers acceptable for a mark are indicated by the use of or.
(Different terms in the mark scheme are shown by a / ; eg allow smooth / free
movement.)

Marking points
3.1

Marking of lists
This applies to questions requiring a set number of responses, but for which
students have provided extra responses. The general principle to be followed in
such a situation is that ‘right + wrong = wrong’.
Each error/contradiction negates each correct response. So, if the number of
error/contradictions equals or exceeds the number of marks available for the
question, no marks can be awarded.
However, responses considered to be neutral (indicated as * in example 1) are
not penalised.

3

Additional Science / Chemistry – AQA GCSE Mark Scheme 2012 June series

Example 1: What is the pH of an acidic solution? (1 mark)
Student

Response

1
2
3
4

4,8
green, 5
red*, 5
red*, 8

Marks
awarded
0
0
1
0

Example 2: Name two planets in the solar system. (2 marks)
Student
1
2

3.2

Response
Neptune, Mars, Moon
Neptune, Sun, Mars,
Moon

Marks awarded
1
0

Use of chemical symbols / formulae
If a student writes a chemical symbol / formula instead of a required chemical
name, full credit can be given if the symbol /...

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