Sodium sulfate and barium sulfate are both giant ionic substances.
When sodium sulfate is mixed with deionised water, the resulting mixture conducts electricity and behaves as an electrolyte.
When barium sulfate is mixed with deionised water, the mixture does not conduct electricity and does not behave as an electrolyte.
Explain, in terms of solubility and the movement of ions, this difference in electrical conductivity.
59 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.