Silicon dioxide and magnesium oxide both have very high melting points. Which statement gives a difference between the two substances?
Silicon dioxide has covalent bonds and magnesium oxide has ionic bonds
Silicon dioxide has ionic bonds and magnesium oxide has covalent bonds
Silicon dioxide has a giant structure and magnesium oxide has molecules
Silicon dioxide has molecules and magnesium oxide has a giant structure
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.