Question

Ella makes this table to organize her notes on whether atoms gain or lose energy during the changes of state.

A 2-column table with 2 rows. The first row has entries Gain Energy, Lose Energy. The second row has entries nothing, nothing.

Which changes of state should she place in the column titled "Lose Energy"?

freezing, boiling, and melting
melting, vaporization, and sublimation
sublimation, deposition, and condensation
freezing, deposition, and condensation

Answer 1

freezing, deposition, and condensation

These are exothermic changes (gas → liquid: condensation; liquid → solid: freezing; gas → solid: deposition), so atoms lose energy.