R3.2 (Electrolysis/voltaic cells)

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19 Terms

1
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What reaction occurs at the Cathode?

Reduction

2
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What reaction occurs at the Anode?

Oxidation

3
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What direction do electrons flow in electrolysis and voltaic cells?

Anode → Cathode

4
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Charge of Cathode (Electrolysis)

-

5
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Charge of Anode (Electrolysis)

+

6
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Charge of Cathode (Voltaic cell)

+

7
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Charge of Anode (Voltaic cell)

-

8
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Function of salt bridge in voltaic cells

Allow ions to flow between half-cells to balance the charge and complete the circuit

9
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Where do cations flow towards?

Cathode

10
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Where do anions flow towards?

Anode

11
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Which electrochemical cells are reversible?

Secondary cells

12
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Examples of secondary cells

Lead-acid and lithium-ion batteries

13
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Advantages of Lead-acid batteries

Easy to manufacture, low cost and low self-discharge rates

14
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Advantages of lithium-ion batteries

High energy density and low discharge rates

15
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Disadvantages of lithium-ion batteries

Explosion risk and difficult to extinguish lithium fires

16
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Energy change in electrolytic cell

Electrical to chemical

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Energy change of voltaic cell

Chemical to electrical

18
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Spontaneity of electrolytic cell

non-spontaneous

19
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Spontaneity of voltaic cell

Spontaneous