Cambridge IGCSE Combined Science practice

Paper 3 structured question: Corrosion of metals

Try the question first, then check the answer and practise the same topic again.

At a glance

Paper

Marks

Topic

Corrosion of metals

Exam-style question

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Paper 3Theory (Core)2 marks

Rusting of iron is a significant issue in many industries.

Description

Iron rusts when it is exposed to moisture and oxygen, leading to the formation of iron oxide.

a
Explain the conditions necessary for iron to rust.
Your answer
Aim for approximately 2 distinct marking points.
[2]

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Paper 3Theory (Core)3 marks

Description

The presence of salt can increase the rate of rusting in iron.

a
Discuss the role of salt in the rusting process of iron.
Your answer
Aim for approximately 3 distinct marking points.
[3]