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Aim, Underlying chemistry and Experimental Approach
Candidate A
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Experimental method: I measured the pH of water before and after samples of different fertilisers
were added.
Marks Grid
Skills & KU Max mark
Mark awarded
Comments
1 Aim
An aim that describes clearly the purpose of the investigation.
1
2 Underlying
chemistry
An account of
chemistry relevant
to the aim of the
investigation.
3
1 A-type mark
3 Data collection
and handling
(a) A brief description
of the approach
used to collect
experimental data.
1
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Candidate B
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Marks Grid
Skills & KU Max mark
Mark awarded
Comments
1 Aim
An aim that describes clearly the purpose of the investigation.
1
2 Underlying
chemistry
An account of
chemistry relevant
to the aim of the
investigation.
3
1 A-type mark
3 Data collection
and handling
(a) A brief description
of the approach
used to collect
experimental data.
1
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Candidate C
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Marks Grid
Skills & KU Max mark
Mark awarded
Comments
1 Aim An aim that
describes clearly the purpose of the investigation.
1
2 Underlying
chemistry
An account of
chemistry relevant
to the aim of the
investigation.
3
1 A-type mark
3 Data collection
and handling
(a) A brief description
of the approach
used to collect
experimental data.
1
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Candidate D
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Marks Grid
Skills & KU Max mark
Mark awarded
Comments
1 Aim An aim that
describes clearly the purpose of the investigation.
1
2 Underlying
chemistry
An account of
chemistry relevant
to the aim of the
investigation.
3
1 A-type mark
3 Data collection
and handling
(a) A brief description
of the approach
used to collect
experimental data.
1
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Candidate E
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Marks Grid
Skills & KU Max mark
Mark awarded
Comments
1 Aim An aim that
describes clearly the purpose of the investigation.
1
2 Underlying
chemistry
An account of
chemistry relevant
to the aim of the
investigation.
3
1 A-type mark
3 Data collection
and handling
(a) A brief description
of the approach
used to collect
experimental data.
1
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Data collection and handling and Graphical Presentation
Candidate A
I connected different pairs of metals were connected to see which produces the highest voltage when
connected in an electrochemical cell.
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Marks Grid
Skills & KU Max mark
Mark awarded
Comments
3 Data collection
and handling
(b) Sufficient raw data
from the
candidate’s
experiment.
1
(c) Data presented in a correctly produced table.
1
(d) Mean and/or
derived values
calculated
correctly.
1
A-type mark
4 Graphical
presentation
(a) An appropriate format from the options of scatter graph, line graph or bar graph.
1
(b) The axis/axes of the graph has/have suitable scale(s).
1
(c) The axes of the graph have suitable labels and units.
1
(d) Accurately plotted data points and, where appropriate, a line of best fit.
1
A-type mark
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Candidate B
Marks Grid
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Skills & KU Max mark
Mark awarded
Comments
3 Data collection
and handling
(b) Sufficient raw data
from the
candidate’s
experiment.
1
(c) Data presented in a correctly produced table.
1
(d) Mean and/or
derived values
calculated
correctly.
1
A-type mark
4 Graphical
presentation
(a) An appropriate format from the options of scatter graph, line graph or bar graph.
1
(b) The axis/axes of the graph has/have suitable scale(s).
1
(c) The axes of the graph have suitable labels and units.
1
(d) Accurately plotted data points and, where appropriate, a line of best fit.
1
A-type mark
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Candidate C
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Marks Grid
Skills & KU Max mark
Mark awarded
Comments
3 Data collection
and handling
(b) Sufficient raw data
from the
candidate’s
experiment.
1
(c) Data presented in a correctly produced table.
1
(d) Mean and/or
derived values
calculated
correctly.
1
A-type mark
4 Graphical
presentation
(a) An appropriate format from the options of scatter graph, line graph or bar graph.
1
(b) The axis/axes of the graph has/have suitable scale(s).
1
(c) The axes of the graph have suitable labels and units.
1
(d) Accurately plotted data points and, where appropriate, a line of best fit.
1
A-type mark
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Candidate D
The candidate did not provide any details on the experimental approach.
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Marks Grid
Skills & KU Max mark
Mark awarded
Comments
3 Data collection
and handling
(b) Sufficient raw data
from the
candidate’s
experiment.
1
(c) Data presented in a correctly produced table.
1
(d) Mean and/or
derived values
calculated
correctly.
1
A-type mark
4 Graphical
presentation
(a) An appropriate format from the options of scatter graph, line graph or bar graph..
1
(b) The axis/axes of the graph has/have suitable scale(s).
1
(c) The axes of the graph have suitable labels and units.
1
(d) Accurately plotted data points and, where appropriate, a line of best fit.
1
A-type mark
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