Question

the diagram shows heat being removed from the substance, causing
a. it to form a liquid as its particles move closer together.
b. it to form a liquid as its particles move farther apart.
c. it to form a gas as its particles move closer together.
d. it to form a solid as its particles move farther apart.

Explanation:

When heat is removed from a substance, the particles lose energy. In the diagram, the particles move closer together. If the substance is changing from a gas to a liquid (condensation) or liquid to solid (freezing), removing heat causes particles to move closer. Here, the general principle is that removing heat (lowering energy) makes particles move closer. Option A says "it to form a liquid as its particles move closer together" which aligns with the particle - movement concept when heat is removed (for example, gas to liquid: particles move closer as heat is removed).

Answer:

A. it to form a liquid as its particles move closer together