CAMBRIDGE IGCSE™ CHEMISTRY: WORKSHEET 6
Name
Date
6C: Electrochemistry
1 What is electrolysis?
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2 Explain the conditions required for electrolysis to work.
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3 Draw an electrolytic cell and label it.
4 This question relates to the electrolysis of molten compounds.
a Complete the following table.
Salt
Anode
Cathode
Potassium bromide
Aluminium oxide
Barium iodide
Sodium chloride
Calcium fluoride
Magnesium oxide
Cambridge IGCSE™ Chemistry – Scholier © Cambridge University Press 2021
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CAMBRIDGE IGCSE™ CHEMISTRY: WORKSHEET 6
b Look at your completed table from part a. What is the pattern?
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5 Calcium can be extracted from molten potassium fluoride.
a Write an equation to show the electrolysis of KF2.
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b Write equations to show the reactions that occur at both electrodes.
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6 This question relates to the electrolysis of sodium chloride solution.
a What is produced at each electrode when dissolved NaCl is electrolysed?
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b Write half-equations to show what is formed when dissolved NaCl is electrolysed.
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7 What are the three general rules for electroplating a metal object with another metal?
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8 This question relates to the hydrogen fuel cell.
a What is the definition of a hydrogen fuel cell?
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b Write the overall reaction in a hydrogen fuel cell.
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c Complete the oxidation and reduction half-equations.
Oxidation:
____H2 à ________ + ________
Reduction:
____O2 + ________ + ________ à ________
Cambridge IGCSE™ Chemistry – Scholier © Cambridge University Press 2021
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