Page 41 - Ranger SPM 2022 - Science

Science SPM Chapter 6 Electrochemistry
(c) Explain the formation of gas X at electrode P based on the selective discharge
HOTS
HOTS of ions. [2 marks]
Section C
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3. (a) Compare and contrast an electrolytic cell and a chemical cell. [2 marks]

(b) Figure 3 shows three examples of the application of electrolysis.
Carbon electrodes

Dilute sodium
chloride solution

A

Form 5
Electrolysis

+ – + –
Impure Pure
Copper Key copper copper
(cathode)
(anode) (cathode) (anode)
Foreign
Copper(II) sulphate solution substance Copper(II) sulphate solution
Figure 3
Study the information in Figure 3 and construct the concept of electrolysis. Your
answer should be based on the following aspects:
(i) Identify three common characteristics. [3 marks]

(ii) Give one example of an application of electrolysis other than the examples
given in Figure 3 above and state one of its characteristics. [1 mark]
(iii) Relate the common characteristics to construct the actual concept of electrolysis.
[6 marks]

Chapter 6 Answers

293

F5 Chapter 6.indd 293 3/21/22 3:59 PM