SD Science Grade 8 Practice Questions - South Dakota Science Assessment - Grade 8 Exam

As a sample of water is heated from 20°C to 80°C, what occurs at the molecular level?

The average kinetic energy of the water molecules increases. The water molecules expand and increase in mass. The water molecules stop moving completely. The chemical bonds between hydrogen and oxygen break to form gas atoms.

Correct Answer:

The average kinetic energy of the water molecules increases.

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