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QuizMultiple Choice

Liquids — Unit test

Question 1 • IA-Chemistry A Survey of Chemistry A

Which statement best explains why heating a liquid affects its viscosity?

Answer
A
The molecules move faster at higher temperatures and overcome attractions more easily.
B
The molecules move faster at higher temperatures, and the attractions between them increase.
C
The molecules move slower at higher temperatures and overcome attractions more easily.
D
The molecules move slower at higher temperatures, and the attractions between them decrease.

Explanation

Heating gives liquid molecules more kinetic energy, so they move faster. Their increased motion helps them overcome intermolecular attractions and slide past one another more easily, which lowers the liquid’s viscosity. Thus, the best statement is that molecules move faster and overcome attractions more easily.

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