A teacher electrolyses some molten compounds.
The teacher heats each compound in a crucible until it melts. Two graphite electrodes are dipped into the molten compound. The electrodes are connected to a d.c. power supply.
The table shows the products at each electrode.
| Molten compound | Product at the negative electrode (cathode) | Product at the positive electrode (anode) |
|---|---|---|
| zinc chloride | zinc | ? |
| lithium bromide | ? | bromine |
| lead iodide | lead | ? |
Complete the table.
Complete the sentences.
Use words from the list: anode, atoms, cathode, electrolyte, electrons
The molten compound that is broken down is called the ...... . The positive metal ions move to the ...... .
Solid zinc chloride does not conduct electricity. Molten zinc chloride does conduct electricity.
Explain why.
Graphite electrodes are inert.
What does inert mean?
52 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.