Chemistry Quiz: Solubility and Electrolysis sabeena

What is the definition of solubility of cerium(IV) sulphate at a particular temperature?

• The mass of cerium(IV) sulphate that will dissolve in and just saturate 100 g of solvent at that temperature.

• The volume of cerium(IV) sulphate that will dissolve in 100 mL of solvent at that temperature.

• The weight of cerium(IV) sulphate that will dissolve in 50 g of solvent at that temperature.

• The amount of cerium(IV) sulphate that will dissolve in 200 g of solvent at that temperature.

What is the equilibrium established in a saturated solution of cerium(IV) sulphate in contact with undissolved solid?

• Ce(SO4)2(s) + aq → Ce5+(aq) + 2SO42–(aq)

• Ce(SO4)2(s) + aq → Ce3+(aq) + 2SO42–(aq)

• Ce(SO4)2(s) + aq → Ce2+(aq) + 2SO42–(aq)

• Ce(SO4)2(s) + aq → Ce4+(aq) + 2SO42–(aq)

What is the reaction at the cathode during the electrolysis of aqueous copper(II) sulphate?

• CuSO4(aq) → Cu2+(aq) + 2e–

• Cu2+(aq) + 2e– → CuSO4(aq)

• Cu(s) → Cu2+(aq) + 2e–

• Cu2+(aq) + 2e– → Cu(s)

What is the charge in coulombs formula used to calculate the charge passed during the electrolysis experiment?

• charge in coulombs = time in seconds ÷ current in amps

• charge in coulombs = time in minutes × current in amps

• charge in coulombs = time in seconds × current in amps

• charge in coulombs = time in minutes ÷ current in amps

Why would it have been more appropriate to use an analytical balance weighing to 4 decimal places in the electrolysis experiment?

• To reduce the accuracy of the mass measurements

• To speed up the experiment process

• To decrease the precision of the mass measurements

• To increase the precision of the mass measurements

What is the value of the Faraday constant determined in the electrolysis experiment?

• 7.5 × 104 C mol–1

• 10.5 × 104 C mol–1

• 8.5 × 104 C mol–1

• 9.5 × 104 C mol–1

By considering the data processed and the graph drawn, is the experimental procedure suitable for the determination of the Faraday constant?

• No, because the data and graph are not related to the experiment

• Yes, because the data and graph are irrelevant

• No, because the data and graph show inconsistent results

• Yes, because the data and graph show consistent results

What other measurements could be made during the course of the experiment to provide alternative data to confirm the determined value of the Faraday constant?

• Measure the temperature of the electrolyte

• Measure the pH of the electrolyte

• Measure the volume of the electrolyte

• Measure the color of the electrolyte

What is the reaction at the anode during the electrolysis of aqueous copper(II) sulphate?

• CuSO4(aq) → Cu2+(aq) + 2e–

• Cu2+(aq) + 2e– → Cu(s)

• Cu2+(aq) + 2e– → CuSO4(aq)

• Cu(s) → Cu2+(aq) + 2e–

What is the Faraday constant?

• The charge in ohms on 1 mol of electrons

• The charge in amperes on 1 mol of electrons

• The charge in volts on 1 mol of electrons

• The charge in coulombs on 1 mol of electrons