4. Electrochemistry
- Syllabus
- 0620–2026–2027
- Section
- 4
- Level
- —
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Topic 4.1
4.1 Electrolysis
Objectives in this topic
4.1.1—Electrolysis as the decomposition of
- Define electrolysis as the decomposition of an ionic compound, when molten or in aqueous solution, by the passage of an electric current
4.1.2—In simple electrolytic cells: (a) the
- Identify in simple electrolytic cells: (a) the anode as the positive electrode (b) the cathode as the negative electrode (c) the electrolyte as the molten or aqueous substance that undergoes electrolysis
4.1.8—Transfer of charge during electrolysis
- Describe transfer of charge during electrolysis to include: (a) the movement of electrons in the external circuit (b) the loss or gain of electrons at the electrodes (c) the movement of ions in the electrolyte
4.1.3—Products and observations during
- Identify products and observations during electrolysis of: (a) molten lead(II) bromide (b) concentrated aqueous sodium chloride (c) dilute sulfuric acid with inert platinum/carbon electrodes
4.1.4—Metals or hydrogen are formed at the
- State: metals or hydrogen are formed at the cathode and that non-metals (other than hydrogen) are formed at the anode
4.1.5—Predict the identity of the products
- Predict the identity of the products at each electrode for the electrolysis of a binary compound in the molten state
4.1.6—Metal objects are electroplated to
- State: metal objects are electroplated to improve their appearance and resistance to corrosion
4.1.7—Metals are electroplated
- Describe how metals are electroplated
4.1.9—Products formed at the electrodes and
- Identify the products formed at the electrodes and describe the observations made during the electrolysis of aqueous copper(II) sulfate using inert carbon/graphite electrodes and when using copper electrodes
4.1.10—Predict the identity of the products
- Predict the identity of the products at each electrode for the electrolysis of a halide compound in dilute or concentrated aqueous solution
4.1.11—Construct ionic half-equations for
- Construct ionic half-equations for reactions at the anode (to show oxidation) and at the cathode (to show reduction)
Topic 4.2
4.2 Hydrogen–oxygen fuel cells
Objectives in this topic
4.2.1—Hydrogen–oxygen fuel cell uses
- State: a hydrogen–oxygen fuel cell uses hydrogen and oxygen to produce electricity with water as the only chemical product
4.2.2—Advantages and disadvantages of using
- Describe advantages and disadvantages of using hydrogen–oxygen fuel cells in comparison with gasoline/petrol engines in vehicles