A teacher uses different models to represent sodium chloride: a ball-and-stick model, a two-dimensional (2D) diagram of one layer of the lattice, and a dot-and-cross diagram showing one sodium ion and one chloride ion.
State what the balls represent in the ball-and-stick model of sodium chloride.
Explain why the sticks in the ball-and-stick model of sodium chloride are misleading.
Give one limitation of the 2D diagram of the sodium chloride lattice.
Suggest one advantage of a three-dimensional space-filling model of sodium chloride compared with the ball-and-stick model.
Explain one limitation of the dot-and-cross diagram of sodium chloride.
48 exam-style questions on Edexcel GCSE Chemistry 2.5 Types of substance, covering 2.5.1 Classifying substances by structure and bonding, 2.5.2 Properties of ionic and simple molecular substances, 2.5.3 Giant covalent structures: diamond and graphite, 2.5.4 Fullerenes, graphene and simple polymers, 2.5.5 Properties of metals and non-metals, and 2.5.6 Limitations of bonding models and representations. Each one has a worked solution and a mark scheme showing where the marks go.