3.1.11a Electrode potentials and electrochemical cells Quiz: AQA Chemistry, Unit 1

The 20 questions

1. Where do electrons flow between half-cells in an electrochemical cell?

   • Salt bridge
   • Aqueous solution
   • Porous pot
   • External circuit

2. What parameter creates the potential difference in an electrochemical cell?

   • Electrode potential difference
   • Solution temperature
   • Wire resistance
   • Salt bridge length

3. Which energy conversion occurs inside an electrochemical cell?

   • Thermal to electrical
   • Electrical to chemical
   • Chemical to thermal
   • Chemical to electrical

4. Which everyday device is powered by a secondary electrochemical cell?

   • Gas cooker
   • Mains kettle
   • Laptop
   • Solar panel

5. In a cell, in which direction do electrons flow through the wire?

   • Negative to positive
   • Anode to anode
   • Cathode to anode
   • Positive to negative

6. At which electrode does oxidation take place in an electrochemical cell?

   • Salt bridge
   • Cathode
   • Electrolyte
   • Anode

7. What is the main function of a salt bridge in a cell?

   • Increases voltage
   • Prevents current flow
   • Allows ion flow
   • Allows electron flow

8. In the cell Zn | Zn2+ || Cu2+ | Cu, which species is oxidised?

   • Zn2 process
   • Cu2 process
   • Cu
   • Zn

9. Why does an electrochemical cell produce electrical work instead of heat?

   • Half-reactions are separated
   • Pressure is high
   • Reactants are mixed
   • Temperature is constant

10. What process takes place at the cathode of an electrochemical cell?

    • Oxidation
    • Neutralisation
    • Reduction
    • Hydration

11. What drives electrons through the external circuit of an electrochemical cell?

    • Ionic current
    • Potential difference
    • Thermal expansion
    • Activation energy

12. A non-rechargeable cell stops producing a current when what is reached?

    • Maximum resistance
    • Boiling point
    • Chemical equilibrium
    • Zero temperature

13. Why is a high-resistance voltmeter used when measuring cell EMF?

    • Minimises current flow
    • Maximises current flow
    • Standardises cell temperature
    • Measures electron charge

14. Where do oxidation and reduction occur in an electrochemical cell?

    • Separate electrodes
    • Salt bridge
    • External voltmeter
    • Same electrode

15. What species are eliminated when combining two half-equations to form an overall cell equation?

    • Electrons
    • Spectator anions
    • Metal ions
    • Protons

16. What is a key commercial application of electrochemical cells?

    • Electroplating plastics
    • Powering electric vehicles
    • Purifying natural gas
    • Generating nuclear power

17. Why are electrochemical cells well suited for portable electronic devices?

    • Compact energy source
    • Unlimited lifespan
    • Mains voltage supply
    • High thermal output

18. In the cell Zn|Zn2+||Cu2+|Cu, which species forms the positive electrode?

    • Hydrogen
    • Platinum
    • Zinc
    • Copper

19. What is the potential difference across a cell when zero current flows called?

    • Activation energy
    • Current density
    • Cell resistance
    • Electromotive force

20. What process occurs at the positive electrode in a Zn|Zn2+||Cu2+|Cu cell?

    • Oxidation of Zn
    • Reduction of Cu2+
    • Oxidation of Cu
    • Reduction of Zn2+

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