Displacement reactions involving metal oxides
4 marks · NormalAnswer the following about redox reactions and agents.
State what is meant by oxidation.
State what is meant by reduction.
Explain what an oxidising agent does in a reaction.
Give the definition of a reducing agent.
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(a) Oxidation is the gain of oxygen (or loss of electrons, accept either).
(b) Reduction is the loss of oxygen (or gain of electrons, accept either).
(c) An oxidising agent causes another substance to lose electrons or gain oxygen (accept either).
(d) A reducing agent donates electrons or removes oxygen from another substance (accept either).
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Marking points
B1 (a) · 1 mark · Correctly defines oxidation as gain of oxygen or loss of electrons.
B2 (b) · 1 mark · Correctly defines reduction as loss of oxygen or gain of electrons.
B3 (c) · 1 mark · Correctly explains oxidising agent as causing another substance to be oxidised.
B4 (d) · 1 mark · Correctly defines reducing agent as causing reduction/accepts alternative correct description.
Worked solution
(a) Oxidation is the gain of oxygen (or loss of electrons).
(b) Reduction is the loss of oxygen (or gain of electrons).
(c) An oxidising agent makes another substance lose electrons or gain oxygen.
(d) A reducing agent donates electrons or removes oxygen from a substance.