Solid magnesium chloride does not conduct electricity, but molten magnesium chloride does conduct electricity. Which statement explains why the solid does not conduct electricity?
The ions in the solid do not have an overall electric charge
The solid does not contain any delocalised or free electrons
The electrostatic forces in the solid are too weak to carry charge
The ions in the solid are held in fixed positions and cannot move
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.