5
QuizMultiple Choice

Intermolecular Forces

Question 5 • *26-27 CFISD TX-Chemistry A CR

Which statement best explains why water has a higher boiling point than ethane?

Answer
A
Ethane molecules are smaller than water and can move faster.
B
Water molecules need relatively less heat energy to move.
C
Water molecules form hydrogen bonds, which cannot be broken by heating water.
D
Ethane molecules have no hydrogen bonds and need less energy to separate.

Explanation

Water molecules attract one another through hydrogen bonds, so separating them into a gas requires substantial heat energy. Ethane molecules do not form hydrogen bonds; their attractions are weaker, so less energy is needed to separate them and boil ethane. Choice D correctly describes this difference. Choice C is incorrect because heating can overcome water’s intermolecular hydrogen bonds.

AI-written and checked against the verified answer.

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