Reactions of metals with water

2 marks · Hard

Iron reacts with steam to form a black solid and hydrogen gas. State the name and chemical formula of the black solid formed.

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(i) tri-iron tetroxide · must show tri-iron tetroxide, iron(II,III) oxide

(ii) Fe3O4 · must show Fe3O4

Must show: tri-iron tetroxide, Fe3O4

Also accept: iron(II,III) oxide

Common mistakes: iron(II) oxide; iron(III) oxide

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Marking points

B1 · 1 mark · Names tri-iron tetroxide (or allows iron(II,III) oxide).

B2 · 1 mark · Gives correct formula: Fe3O4.

Worked solution

The black solid is called tri-iron tetroxide.