The properties of oxides
2 marks · HardCalcium reacts with oxygen to form calcium oxide. State whether calcium oxide is acidic, basic or neutral. Explain your answer.
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Calcium oxide is basic because it is a metal oxide.
Also accept: Basic because it is formed from a metal; It is basic, as it is the oxide of a metal
Common mistakes: Acidic because it reacts with water; Neutral
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Marking points
B1 · 1 mark · States that calcium oxide is basic.
B2 · 1 mark · Correctly links to being a metal oxide or from a metal.
Worked solution
Calcium oxide is basic because it is a metal oxide. Metal oxides are generally basic.