Edexcel IGCSE Chemistry 2.18 conditions for rusting

Practise rusting-condition questions by naming oxygen and water, then identifying rust as hydrated iron(III) oxide in short answers.

Exam points

State oxygen and water as the two substances needed for iron to rust fully.
Give rust as hydrated iron(III) oxide, with iron(III) oxide accepted where allowed.

[Maximum number: 2]

When iron rusts, iron(III) oxide forms.
State two conditions needed for iron to rust.

1 ................................

2 ................................

- oxygen / $\ce{O2}$
- water / $\ce{H2O}$

Allow:
- air
- moisture / water vapour / steam

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2.18 Conditions for rusting question 1