Question

during which changes of state does the motion of the atoms decrease?
melting and deposition
freezing and condensation
condensation and evaporation
vaporization and sublimation

Explanation:

• Melting: Solid to liquid, atoms gain energy, motion increases.
• Deposition: Gas to solid, atoms lose energy, motion decreases. But one correct one is not enough.
• Freezing: Liquid to solid, atoms lose energy, motion decreases.
• Condensation: Gas to liquid, atoms lose energy, motion decreases.
• Evaporation: Liquid to gas, atoms gain energy, motion increases.
• Vaporization: Liquid to gas, atoms gain energy, motion increases.
• Sublimation: Solid to gas, atoms gain energy, motion increases.

Answer:

Freezing and condensation.