Test Your Understanding
Topic: Electrolysis
Hover over each blank to reveal the correct answer.
Definition of Electrolysis
1. Electrolysis is the ________ of an ________ compound when ________ or in ________ solution by the passage of an electric current.
2. Electrolysis only occurs when ions are free to ________.
3. The substance that is broken down during electrolysis must contain ________ ions.
Parts of an Electrolytic Cell
4. The ________ is the positive electrode in electrolysis.
5. ________ ions move towards the anode.
6. The ________ is the negative electrode in electrolysis.
7. ________ ions move towards the cathode.
8. The ________ is the molten or aqueous substance that undergoes electrolysis.
9. The electrolyte contains mobile ________ that carry electrical charge.
Products at Electrodes
10. ________ or ________ are formed at the cathode.
11. ________ (other than hydrogen) are formed at the anode.
Electrolysis of Molten Lead(II) Bromide
12. Molten lead(II) bromide contains ________ and ________ ions.
13. ________ metal forms at the cathode.
14. Observation: ________ metal deposits at the cathode.
15. ________ gas forms at the anode.
16. Observation: ________ coloured fumes are produced.
Electrolysis of Concentrated Sodium Chloride
17. Concentrated sodium chloride solution is also called ________.
18. ________ gas is produced at the cathode.
19. Observation: ________ of gas are seen.
20. ________ gas forms at the anode.
21. Observation: ________ gas is released.
Electrolysis of Dilute Sulfuric Acid
22. Dilute sulfuric acid produces ________ gas at the cathode.
23. ________ gas forms at the anode.
24. The electrodes used are usually ________ or ________.
Electroplating
25. Electroplating is used to improve the ________ of metal objects.
26. It also increases resistance to ________.
27. The object to be plated is connected to the ________.
28. The metal used for coating is connected to the ________.
Transfer of Charge
29. In the external circuit, charge is carried by ________.
30. In the electrolyte, charge is carried by ________.
31. ________ occurs at the cathode where electrons are gained.
32. ________ occurs at the anode where electrons are lost.
Half Equations
33. A half-equation shows the transfer of ________ during electrolysis.
34. At the cathode, ions ________ electrons.
35. At the anode, ions ________ electrons.
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