Question

Which statement best explains why heating a liquid affects its viscosity?
The molecules move faster at higher temperatures and overcome attractions more easily.
The molecules move faster at higher temperatures, and the attractions between them increase.
The molecules move slower at higher temperatures and overcome attractions more easily.
The molecules move slower at higher temperatures, and the attractions between them decrease.

Answer 1

The molecules move faster at higher temperatures and overcome attractions more easily.

Heating raises molecules' kinetic energy, so they move more rapidly and can more readily overcome intermolecular attractions, reducing resistance to flow (lower viscosity).