Question 1(b)
[Maximum number: 1]
Give the name of the process that is used:
to produce lead from molten lead(II) bromide
IGCSE Chemistry Extended 4.1.1—Electrolysis as the decomposition of Topic Practice
4.1.1—Electrolysis as the decomposition of
• Define electrolysis as the decomposition of an ionic compound, when molten or in aqueous solution, by the passage of an electric current
Question 3(c)(i)
[Maximum number: 2]
Potassium reacts with chlorine to form potassium chloride, KCl.
Molten potassium chloride undergoes electrolysis.
State what is meant by the term electrolysis.
Question 2(a)(i)
[Maximum number: 2]
This question is about electrolysis.
What is meant by the term electrolysis?
Question 3(c)(i)
[Maximum number: 2]
This question is about elements and compounds.
A dilute aqueous solution of potassium chloride undergoes electrolysis.
Oxygen is produced at the anode.
State what is meant by the term electrolysis.
Question 3(c)(i)
[Maximum number: 2]
This question is about the elements sodium and fluorine and the compound sodium fluoride.
Dilute aqueous sodium fluoride undergoes electrolysis.
Hydrogen is produced at the cathode.
State what is meant by the term electrolysis.
Question 3(c)(i)
[Maximum number: 2]
Sodium reacts with fluorine to form sodium fluoride, NaF.
Aqueous sodium fluoride undergoes electrolysis.
State what is meant by the term electrolysis.
Question 12
Electrolytes can be broken down by electrolysis.
Which rows are correct for each electrolyte?
A 1 and 2
B 1 and 4
C 2 and 3
D 3 and 4
Question 2(a)(ii)
[Maximum number: 2]
Aluminium is extracted from its ore. The ore is converted into pure aluminium oxide, which then undergoes electrolysis as shown.
What is meant by the term electrolysis?
Question 3(b)
[Maximum number: 2]
Aluminium is extracted from its ore by electrolysis.
State what is meant by the term electrolysis.
Question 14
[Maximum number: 1]
Which statement about electrolysis is correct?
A
Chemical energy is converted to electrical energy.
B
Electrons flow through the electrolyte.
C
Ionic compounds are broken down.
D
Metals are formed at the positive electrode.