Reactions of the halogens
2 marks · NormalState the physical state and colour of chlorine and iodine at room temperature.
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Also accept: chlorine: green gas; iodine: grey solid; chlorine is a green gas; iodine is a grey solid
Common mistakes: confusing liquid/solid/gas; giving incorrect colours (e.g., purple for iodine at room temperature)
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Marking points
B1 · 1 mark · Correct state AND colour for chlorine: green gas
B2 · 1 mark · Correct state AND colour for iodine: grey solid
Worked solution
Chlorine is a green gas at room temperature. Iodine is a grey solid at room temperature.