Version 2.0 Copyright © AQA and its licensors. All rights reserved. C2 2.7 Electrolysis

Version 2.0 Copyright © AQA and its licensors. All rights reserved.

C2 2.7 Electrolysis

Using Exam pro items to support successful outcomes

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• Learners will be able to test their progress against learning outcomes using questions from past AQA GCSE examinations

• C2 2.7

Foundation Tier- June 12, 4

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• C2 2.7

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• C2 2.7

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• C2 2.7

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• C2 2.7

Mark scheme- Foundation

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• C2 2.7

Q Answer Extra Information Mark (a)(i) Cryolite 1(a)(ii) Lower the melting point of the aluminium

oxide1

(b)(i) Opposite charges or oxide ions are negativeAttract

11

(b)(ii) Carbon 1

(b)(iii)

Reacts with oxygen or forms carbon dioxide Accept burns 1

(c) Structure mark:Either Al (atoms) in layers/rows

Or alloy (atoms) not in layers / rows

Sliding mark:either so (Al layers) can slideOr so (alloy) layers cannot slide

Accept Al (atoms) all the same sizeAllow Al (atoms) in linesAccept different sizes of atoms in alloyAllow alloy (atoms) not in lines

1

1

Total 8

Higher Tier June 12, 5

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• C2 2.7

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• C2 2.7

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• C2 2.7

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• C2 2.7

Mark scheme- Higher

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• C2 2.7

Q Answer Extra Information Mark(a) 52.9 (411765/53 ) Correct answer with or without

working = 2 marksIf answer is incorrectAllow 2 x 27 = 54 or 27/102 x 100Or 26.5 for 1 mark

2

(b)(i) Because it lowers the melting point ( of the aluminium oxide)So less energy is needed ( to melt it)

Allow lowers the temperature needed.Do not accept lowers boiling pointAccept so that the cell / equipment does not melt.

1

1

(b)(ii) 2 O2- on left hand side4e- on right hand side

Accept correct multiples or fractionsAccept - 4e- on left hand side

11

(b)(iii) Because the electrode reacts with oxygen orBecause the electrode burnsTo form carbon dioxide or electrode made from carbon / graphite

1

1

8

• C2 2.7