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In-class Tutorial 6.1 and 6.2

Chapter 6 Electrochemistry

4S Xin and 4S Ping 2016

Name: ________________________________ Date: ______________________

Score: / 22 marks

Question 1

Classify the following materials into conductors and non-conductors. [4m]

Material Conductor / Non-conductor

Copper

Plastic

Graphite

Platinum

Question 2

Classify the following chemicals into electrolyte and non-electrolytes. [4m]

Chemicals Electrolyte

Copper(II) chloride

Sucrose

Benzene, C6H6Sodium bromide

Question 3

Diagram below shows the apparatus set-up to study the electrolysis of molten sodium

chloride using graphite electrode. The electrolysis is carried out for 30 minutes.

(a)Define electrolysis. [1m]

(b)State the meaning of electrolyte. [1m]

Graphite electrode

Molten sodium chloride

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(c)What is the meaning of anion? [1m]

(d)State all the ions present in molten sodium chloride. [1m]

(e)Name the ions that will present in

Cathode: .[1m]

Anode: [1m]

(f) Write the half equations for the reaction that occurs at

Cathode: .[1m]

Anode: [1m]

(g)Write the overall equation based for this electrolytic process

[2m]

(h)

Suggest the possible observation that will take place at the anode and cathode.

[2m]

ANODE CATHODE

(i) Based on the diagram above, show the flow of electron. [1m]

Question 4

Draw a labelled diagram to show the electrolytic process which involved the usage of

graphite electrodes and molten potassium bromide as the electrolyte. Based on the

diagram, show the flow of electron. [3m]