*jun208464c1H01*

IB/M/Jun20/E9 8464/C/1H

For Examiner’s Use

Question Mark

1

2

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7

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Thursday 14 May 2020 Morning Time allowed: 1 hour 15 minutes

Materials

For this paper you must have:

• a ruler

• a scientific calculator

• the periodic table (enclosed).

Instructions

• Use black ink or black ball-point pen.

• Pencil should only be used for drawing.

• Fill in the boxes at the top of this page.

• Answer all questions in the spaces provided.

• If you need extra space for your answer(s), use the lined pages at the end of

this book. Write the question number against your answer(s).

• Do all rough work in this book. Cross through any work you do not want to be

marked.

• In all calculations, show clearly how you work out your answer.

Information

• The maximum mark for this paper is 70.

• The marks for questions are shown in brackets.

• You are expected to use a calculator where appropriate.

• You are reminded of the need for good English and clear presentation in your answers.

Please write clearly in block capitals.

Centre number Candidate number

Surname

Forename(s)

Candidate signature

I declare this is my own work.

GCSE

COMBINED SCIENCE: TRILOGY

Higher Tier

Chemistry Paper 1H

H

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IB/M/Jun20/8464/C/1H

0 1 This question is about the extraction of aluminium.

0 1 . 1 An aluminium atom is represented as:

Al 13

27

Give the number of electrons and neutrons in the aluminium atom.

[2 marks]

Number of electrons

Number of neutrons

Aluminium is extracted by the electrolysis of a molten mixture of aluminium oxide

and cryolite.

Figure 1 shows the cell used for the electrolysis.

Figure 1

0 1 . 2 Aluminium is produced by the reduction of aluminium oxide (Al2O3).

What is meant by the term reduction?

[1 mark]

Do not write

outside the

box

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IB/M/Jun20/8464/C/1H

Do not write

outside the

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0 1 . 3 Oxygen is formed at the positive carbon electrodes.

Explain why the positive carbon electrodes must be continually replaced.

[3 marks]

0 1 . 4 A substance conducts electricity because of free moving, charged particles.

What are the free moving, charged particles in a:

• carbon electrode (made from graphite)

• molten mixture of aluminium oxide and cryolite

• metal wire?

[3 marks]

Carbon electrode (made from graphite)

Molten mixture of aluminium oxide and cryolite

Metal wire

Turn over for the next question

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