Ammonia, NH3\text{NH}_3NH3, consists of small molecules. Ammonia boils at −33 ∘C-33\ ^\circ\text{C}−33 ∘C.
Explain why substances that consist of small molecules have low boiling points.
Liquid ammonia does not conduct electricity. Give one reason why.
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.