Simple molecular structures
2 marks · EasyIodine melts at 114°C and boils at 184°C. Calculate the temperature range (in °C) over which iodine is a liquid.
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70 °C (±0)
Common mistakes: 184/114 instead of subtraction
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Marking points
M1 · 1 mark · Correct method shown: boiling point minus melting point.
A1 · 1 mark · Correct answer: 70 °C.
Worked solution
Temperature range = boiling point - melting point
So iodine is a liquid over a range of 70 °C.