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AQA-A-LEVEL-CHEMISTRY PAPER -MARKSCHEME
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lA-level
CHEMISTRY
7405/1
Paper 1 Inorganic and Physical Chemistry
Mark scheme
June 2021
Version: 1.0 Final
Chapter: AQA A LEVEL CHEMISTRY PAPER 1 7405-1 2021 MARK SCHEME MS
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MARK SCHEME – A-LEVEL CHEMISTRY – 7405/1 – JUNE
2021
Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevantquestions,
by a panel of subject teachers. This mark scheme includes any amendments made at the standardisation events
which all associates participate in and is the scheme which was used by them inthis examination. The
standardisation process ensures that the mark scheme covers the students’ responses to questions and that every
associate understands and applies it in the same correct way.
As preparation for standardisation each associate analyses a number of students’ scripts. Alternativeanswers not
already covered by the mark scheme are discussed and legislated for. If, after the standardisation process,
associates encounter unusual answers which have not been raised they arerequired to refer these to the Lead
Examiner.
It must be stressed that a mark scheme is a working document, in many cases further developed and expanded on
the basis of students’ reactions to a particular paper. Assumptions about future mark schemes on the basis of one
year’s document should be avoided; whilst the guiding principles of assessment remain constant, details will
change, depending on the content of a particular examinationpaper.
Further copies of this mark scheme are available from aqa.org.uk
Chapter: AQA A LEVEL CHEMISTRY PAPER 1 7405-1 2021 MARK SCHEME MS
Copyright information
AQA retains the copyright on all its publications. However, registered schools/colleges for AQA are permitted to copy material from this booklet for their own internal use,
with the following important exception: AQA cannot give permission to schools/colleges to photocopy any material that is acknowledged to a thirdparty even for internal use
within the centre.
Copyright © 2021 AQA and its licensors. All rights reserved.
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MARK SCHEME – A-LEVEL CHEMISTRY – 7405/1 – JUNE
2021
AS and A-Level Chemistry
Mark Scheme Instructions for 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 areain which
a mark or marks may be awarded.
The extra information in the ‘Comments’ column 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.
You should mark according to the contents of the mark scheme. If you are in any doubt aboutapplying the
mark scheme to a particular response, consult your Team Leader.
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 thediagram 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 might
Chapter: AQA A LEVEL CHEMISTRY PAPER 1 7405-1 2021 MARK SCHEME MS
confuse the main part of the mark scheme yet may be helpful in ensuring that marking isstraightforward
and consistent.
The use of M1, M2, M3 etc in the right-hand column refers to the marking points in the order in which
they appear in the mark scheme. So, M1 refers to the first marking point, M2 the secondmarking point
etc.
2. Emboldening
2.1 In a list of acceptable answers where more than one mark is available ‘any two from’ isused,
with the number of marks emboldened. Each of the following bullet points is a potential
mark.
2.2 A bold and is used to indicate that both parts of the answer are required to award themark.
2.3 Alternative answers acceptable for a mark are indicated by the use of OR. Different termsin the
mark scheme are shown by a / ; eg allow smooth / free movement.
3. Marking points
3.1 Marking of lists
This applies to questions requiring a set number of responses, but for which studentshave
provided extra responses. The general ‘List’ 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 (often prefaced by ‘Ignore’ in the markscheme) are
not penalised.
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