Question

lesson 24: systems and energy
which of the following are exothermic processes?
□ liquid to solid
□ liquid to gas
□ gas to liquid
□ solid to liquid

Explanation:

• Exothermic processes release heat.
• When a liquid turns to a solid (freezing), it releases heat.
• When a gas turns to a liquid (condensation), it releases heat.
• When a liquid turns to a gas (vaporization), it absorbs heat (endothermic).
• When a solid turns to a liquid (melting), it absorbs heat (endothermic).

Answer:

liquid to solid, gas to liquid