Sodium nitrate is dissolved in water. Two electrodes in the solution are connected to a direct current supply.
Which statement explains how the solution conducts electricity?
Positive and negative ions move towards electrodes with opposite charges.
Sodium ions move to the positive electrode and nitrate ions stay in place.
Electrons move through the solution from one electrode to the other.
Sodium nitrate molecules carry charge without separating into ions.
76 exam-style questions on AQA GCSE Chemistry 4.3 Electrolysis, covering 4.3.1a The process of electrolysis, 4.3.1b Half equations in electrolysis, 4.3.2 Electrolysis of molten ionic compounds, 4.3.3 Using electrolysis to extract metals, 4.3.4 Electrolysis of aqueous solutions, and 4.3.5 Representation of reactions at electrodes as half equations. Each one has a worked solution and a mark scheme showing where the marks go.