aim, underlying chemistry and experimental approach ... · aim, underlying chemistry and...

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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