A student makes three statements about models of sodium chloride.
Statement 1: a ball-and-stick model shows the ions much further apart than they really are
Statement 2: a dot-and-cross diagram shows how the ions are arranged in the lattice
Statement 3: the sticks in a ball-and-stick model represent shared pairs of electrons between the ions
Which statements are correct?
1 and 2 only
1 and 3 only
1 only
2 and 3 only
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.