A technician heats solid calcium bromide until it melts. Two electrodes are placed in the molten calcium bromide and connected to a direct current supply.
What is the reason the molten calcium bromide conducts electricity?
Calcium ions and bromide ions move through the liquid and carry charge.
Calcium atoms and bromine atoms move through the liquid and carry charge.
Electrons move through the liquid from one electrode to the other.
Calcium bromide molecules move between the electrodes and carry charge.
98 exam-style questions on OCR GCSE Chemistry 3.4 Electrolysis, covering 3.4.1 Products formed at the electrodes in electrolysis and 3.4.2 The technique of electrolysis. Each one has a worked solution and a mark scheme showing where the marks go.