AQA A LEVEL CHEMISTRY PAPER 3
7405-3 2021 MARK SCHEME MS
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AQA A LEVEL CHEMISTRY
PAPER 3 7405-3 2021 MARK
SCHEME MS
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MARK SCHEME – A-LEVEL CHEMISTRY – 7405/3 – JUNE
2021
1 -4 !
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C D D E F G H E I J K L M N O L K I N G P Q L J G H N M K IJ R D S H T H K N P Q L
UV W X Y Z [ \ V W ] ^ \ \ Z _ ` a b Y c W V d W] V e f e Z VY f a g h f V b Y i \ Z h Z Y j k c
Y W h Z [ \ ` a ^ ` Y a W [ Y \ W X ` a ^ W V ` c d W ] \ lZ f a d e V W m _ Z h Y n V Z o ] Z Y[
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3
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MARK SCHEME – A-LEVEL CHEMISTRY – 7405/3 – JUNE
2021
1. ening
2.1 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 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 the mark.
2.3 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.
2. 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 ‘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
3
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7405-3 2021 MARK SCHEME MS
www.stuvia.com
Downloaded by: academiamaster |
Distribution of this document is illegal
, Stuvia.com - The Marketplace to Buy and Sell your Study Material
AQA A LEVEL CHEMISTRY
PAPER 3 7405-3 2021 MARK
SCHEME MS
Stuvia.com - The Marketplace to Buy an d S e ll y our Study
Stuvia.com - The Marketplace y and SellMaterial
your Study d W ] i f a fm ]g dg [
!"# < | " % v # x $u ( + # u
z w # * * w "v# + $ * % &z{
w * # * + & $w w*
( & x ~ +* % % &| | "
$%&
'(
)*
#+
Downloaded by: academiamaster |
Distribution of this document is illegal
, Stuvia.com - The Marketplace to Buy and Sell your Study
Material
MARK SCHEME – A-LEVEL CHEMISTRY – 7405/3 – JUNE
2021
1 -4 !
8
1 ! .0
C D D E F G H E I J K L M N O L K I N G P Q L J G H N M K IJ R D S H T H K N P Q L
UV W X Y Z [ \ V W ] ^ \ \ Z _ ` a b Y c W V d W] V e f e Z VY f a g h f V b Y i \ Z h Z Y j k c
Y W h Z [ \ ` a ^ ` Y a W [ Y \ W X ` a ^ W V ` c d W ] \ lZ f a d e V W m _ Z h Y n V Z o ] Z Y[
W V i W h e _ f ` a [Y ` a Y [ f p Y q ` \ Y f a r s W V Z h f` _ [ d V` W a_ f d t^ h f `_ j i W h
7 $ + u % v& w u %x * +
3
Downloaded by: academiamaster |
Distribution of this document is illegal
, Stuvia.com - The Marketplace to Buy and Sell your Study
Material
MARK SCHEME – A-LEVEL CHEMISTRY – 7405/3 – JUNE
2021
1. ening
2.1 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 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 the mark.
2.3 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.
2. 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 ‘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
3
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