CAIE A Level Chemistry 9701 · Chemical bonding
Ethanol, , boils at 78 °C; propane, , boils at -42 °C. Compare the types and relative strengths of the intermolecular forces acting between the molecules in each liquid. In your answer, state the atoms involved in a hydrogen bond in ethanol and explain the difference in boiling point.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
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