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Worksheets01 Reduction & Oxidation
Total questions: 16
Worksheet time: 11mins
Reduction is the (a) of electrons.
Oxidation is the (a) of electrons.
A decrease in oxidation number.
Oxidation
Combination
Reduction
Neutralization
Gaining oxygen is an example of...
(NCEA Level 2)
Oxidation
Reduction
Neutralisation
Combinations
In a redox reaction, the species reduced
gains electrons and is the oxidizing agent
loses electrons and is the oxidizing agent
gains electrons and is the reducing agent
loses electrons and is the reducing agent
Substance that oxidizes another substance by accepting its electrons.
Oxidising agent
Reducing agent
Reductant
Oxidant
Substance that reduces another substance by donating / losing its electrons.
Oxidant
Reducing agent
Oxidizing agent
Reductant
Which of the following half reactions correctly represents a reduction half reaction?
Fe → Fe2+ + 2e-
Pb4+ + 2e- → Pb2+
2O-2 → O2 + 4e-
Fe + 3e- → Fe3+
In a reaction, copper ions (Cu2+) is reduced to copper atoms (Cu); its number of electrons has:
Increased
Decreased
Remained Constant
Varies Randomly
Which statement is true for:
Mg → Mg2+ + 2e–
Mg gains 2 electrons
Mg2+ loses 2 electrons
Mg loses 1 electron
Mg loses 2 electrons
4Fe + 3O2 --> 2Fe2O3
Iron oxide
The change of I‾ to I2 is ____________ half equation
Oxidation
Reduction
Neutralization
Decomposition
Combustion
What happens to the oxidation number of an element during reduction?
It increases
It decreases
It remains the same
It varies randomly
Which of the following is an example of a redox reaction?
Combustion of methane
Neutralization of an acid with a base
Decomposition of water
Photosynthesis
