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- Q1
Potassium bromide exists as an ionic lattice. Potassium bromide does not conduct electricity when solid but does conduct electricity when molten.
(i) What is meant by the term ionic lattice?
Users enter free textType an Answer60s - Q2
Explain why potassium bromide does not conduct electricity when solid but does conduct electricity when molten.
Users enter free textType an Answer60s - Q3
Concentrated aqueous potassium bromide is an electrolyte.
What is meant by the term electrolyte?
Users enter free textType an Answer45s - Q4
Describe the electrolysis of concentrated aqueous potassium bromide. Include:
● An ionic half-equation for the reaction at the cathode
● the name of the product at the anode
● the name of the potassium compound formed.
Users enter free textType an Answer300s - Q5
When molten potassium bromide is electrolysed, the product at the cathode is different. Name the product at the cathode when molten potassium bromide is electrolysed.
Users enter free textType an Answer120s - Q6
Copper is refined (purified) by electrolysis. Nickel can be refined using a similar method. (i) The diagram shows the refining of nickel by electrolysis. Complete the labels in the boxes.
Users link answersLinking60s - Q7
A student used the following apparatus to electrolyse concentrated aqueous sodium chloride using inert electrodes. Suggest the name of a metal which could be used as the inert electrodes.
Users enter free textType an Answer30s - Q8
A student used the following apparatus to electrolyse concentrated aqueous sodium chloride using inert electrodes. Name the gas formed at the positive electrode
Users enter free textType an Answer30s - Q9
A student used the following apparatus to electrolyse concentrated aqueous sodium chloride using inert electrodes. Write an ionic half-equation for the reaction occurring at the negative electrode. Include state symbols.
Users enter free textType an Answer60s - Q10
A student used the following electrochemical cell. The reading on the voltmeter was +1.10V
What is the direction of electron flow.
From zinc electrode to copper electrode
From copper electrode to zinc electrode
45s - Q11
Suggest the change, if any, in the voltmeter reading if the zinc electrode was replaced with an iron electrode. Explain your answer.
Users enter free textType an Answer60s - Q12
The zinc electrode was replaced with a silver electrode. The reading on the voltmeter was–0.46V. Suggest why the sign of the voltmeter reading became negative.
Users enter free textType an Answer120s - Q13
Name the ore of aluminium which mainly consists of aluminium oxide.
Users enter free textType an Answer30s - Q14
Aluminium is produced by the electrolysis of aluminium oxide dissolved in molten cryolite. Give two reasons why the electrolysis is done using a molten mixture of aluminium oxide and cryolite instead of molten aluminium oxide only
Users enter free textType an Answer60s - Q15
Write ionic half-equations for the reactions occurring at the positive and negative electrodes.
Users enter free textType an Answer120s
