Phase Change Chemistry Example 1
Follow the full solution, then compare it with the other examples linked below.
Example 1
easyName the six phase changes and indicate whether each absorbs or releases energy.
Solution
- 1 Group the phase changes into those that absorb energy and those that release it.
- 2 Endothermic changes absorb energy: melting (solid→liquid), vaporization (liquid→gas), and sublimation (solid→gas).
- 3 Exothermic changes release energy: freezing (liquid→solid), condensation (gas→liquid), and deposition (gas→solid).
Answer
Phase changes involve energy transfer but not temperature change (at the phase transition point). The energy goes into breaking or forming intermolecular bonds rather than increasing kinetic energy.
About Phase Change
A physical transition from one state of matter to another caused by adding or removing thermal energy, during which the temperature remains constant as energy.
Learn more about Phase Change →More Phase Change Examples
Example 2 medium
Why does the temperature remain constant during a phase change, even though heat is being added?
Example 3 easyWhat phase change occurs when dry ice ([formula]) goes directly from solid to gas?
Example 4 hardA heating curve shows a substance warming from [formula] to [formula]. It has a melting point of [fo