The properties of oxides
2 marks · EasyExplain why carbon dioxide is classed as an acidic oxide. Give a reason for your answer.
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Carbon dioxide is an acidic oxide because it is a non-metal oxide and it reacts with water to form an acidic solution.
Also accept: CO2 reacts with water to form carbonic acid.
Common mistakes: States only that it is a non-metal oxide without giving a reason.
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Marking points
M1 · 1 mark · Identifies that CO2 is a non-metal oxide or acidic oxide.
A1 · 1 mark · Gives a correct reason: reacts with water to form an acidic solution.
Worked solution
Carbon dioxide is an acidic oxide because it is a non-metal oxide and it reacts with water to form an acidic solution.