Differences between the properties of metals and non-metals
2 marks · HardState the acid–base character of the oxides formed by sodium and chlorine. Use one phrase each.
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Sodium forms basic oxides; chlorine forms acidic oxides.
Also accept: Sodium: basic oxide. Chlorine: acidic oxide.; Basic oxide (sodium), acidic oxide (chlorine).
Common mistakes: Saying sodium forms acidic oxides.; Saying chlorine forms basic oxides.; Leaving one element unlabelled.
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Marking points
B1 · 1 mark · States that sodium forms a basic oxide.
B2 · 1 mark · States that chlorine forms an acidic oxide.
Worked solution
Sodium is a metal; metals generally form basic oxides. So, sodium forms a basic oxide (such as sodium oxide, ).
Chlorine is a non-metal; non-metals generally form acidic oxides. Chlorine forms , an acidic oxide.