19
QuizMultiple Choice

States and Changes of Matter — Test

Question 19 • Chemistry

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

Answer
A
The molecules move faster at higher temperatures, and the attractions between them increase.
B
The molecules move slower at higher temperatures and overcome attractions more easily.
C
The molecules move faster 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. They can more easily overcome intermolecular attractions and slide past one another, which lowers the liquid’s viscosity. Thus, “the molecules move faster at higher temperatures and overcome attractions more easily” is the best explanation.

AI-written and checked against the verified answer.

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