Chapter 6: Electrochemistry
A. Knowledge (Definition, meaning and facts) | Check |
- State the meaning of electrolyte.
- State the meaning of electrolysis.
- State three factors affecting electrolysis of an aqueous solution.
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B. Understanding / Application / Analysis | |
- Explain why solution of hydrogen chloride in water can conduct electricity but solution of hydrogen chloride in methylbenzene cannot conduct electricity?
By using example, explain how the following factors can determine the selective discharge of ions at the electrodes.
- Types of electrodes,
- Concentration of the ions.
- Describe the electrolysis of molten lead(II) bromide.
- Describe the extraction of aluminium by electrolysis.
- Draw the structure of Daniell cell and explain how it can produce electricity.
- Draw the structure of a dry cell and explain how it can produce electricity.
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C. Synthesis | |
- Describe a laboratory experiment to extract lead from lead(II) oxide by using electrolysis.
- Describe a laboratory experiment to show that types of electrodes affecting the selective discharge of ions in electrolysis of copper(II) sulphate solution.
- You are given magnesium ribbon, copper plate, magnesium nitrate solution, copper(II) sulphate solution, connecting wires with crocodile clips, 250 cm3 beaker, voltmeter and porous pot.
Construct a voltaic cell by using the above materials.
Explain how the voltaic cell can produce electricity. Your answer must include observation and half equations for reaction at anode and cathode.
- Describe a laboratory experiment to construct the electrochemical series of magnesium, copper, zinc and lead.
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