Chemistry · May / June 2016 · Paper 11 · Question 31
5070Alloys and their properties
The diagram shows the structure of brass. Why is brass harder than pure copper?
- AThe zinc atoms form strong covalent bonds with copper atoms.
- BThe zinc atoms prevent layers of copper atoms from sliding 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.
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Correct answer: B. The zinc atoms prevent layers of copper atoms from sliding over each other easily.
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