Consider the list of six substances with their formulae and boiling points in the table
below.
3.1 Explain why ethanol is soluble in water. Refer to the relative strength of the
intermolecular forces in ethanol and water. (3)
3.2 Explain why the boiling point of iodine is higher than that of bromine. Refer to
the intermolecular forces present in EACH substance in the explanation. (3)
3.3 Explain why phosphine will evaporate faster than ammonia by referring to the
types of intermolecular forces present in EACH substance. (4)
3.4 Water, ethanol and bromine are all liquids at room temperature.
Which ONE will have the highest vapour pressure? (1)
3.5 Give a reason for the answer to QUESTION 3.4 by referring to the relative
strength of the intermolecular forces and boiling points. (2)
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