Pure aluminium is too soft for making aircraft bodies, so an alloy of aluminium is used instead. Which statement about the alloy is correct?
The different sized atoms distort the layers, so the alloy is harder
The different sized atoms remove the layers, so the alloy is softer
The extra delocalised electrons make the alloy harder than the metal
The stronger metallic bonds make the alloy harder than the pure metal
42 exam-style questions on AQA GCSE Chemistry 2.2 How bonding and structure are related to the properties of substances, covering 2.2.1a The three states of matter, 2.2.1b Limitations of the simple particle model, 2.2.2 State symbols in chemical equations, 2.2.3 Properties of ionic compounds, 2.2.4 Properties of small molecules, 2.2.5 Polymers, 2.2.6 Giant covalent structures, 2.2.7 Properties of metals and alloys, and 2.2.8 Metals as conductors. Each one has a worked solution and a mark scheme showing where the marks go.