O-LevelChemistryMetals & Reactivity5070/11 · Oct/Nov 2010 · Q231 Mark

The diagram shows the structure of brass. Why is brass harder than pure copper?

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AThe zinc atoms form strong covalent bonds with copper atoms.

BThe zinc atoms prevent layers of copper atoms from slipping over each other easily.

CThe zinc atoms prevent the 'sea of electrons' from moving freely in the solid.

DZinc atoms have more electrons than copper atoms.

✓ Correct answer

B: The zinc atoms prevent layers of copper atoms from slipping over each other easily.

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Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2010 Paper 1 Variant 1, question 23.

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