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Questions and Answers
What happens to the temperature of a substance during a phase change?
What happens to the temperature of a substance during a phase change?
- It remains constant. (correct)
- It fluctuates dramatically.
- It increases steadily.
- It decreases steadily.
Which process involves a substance absorbing thermal energy?
Which process involves a substance absorbing thermal energy?
- Vaporisation (correct)
- Condensation
- Melting (correct)
- Freezing
At what temperature does water freeze?
At what temperature does water freeze?
- 25 °C
- 0 °C (correct)
- 100 °C
- 50 °C
When does vaporisation occur for a substance?
When does vaporisation occur for a substance?
Which change of state is characterized by the release of thermal energy?
Which change of state is characterized by the release of thermal energy?
Flashcards
Phase Change
Phase Change
A change in the state of matter, such as from solid to liquid or liquid to gas.
Melting Point
Melting Point
The temperature at which a substance changes from a solid to a liquid.
Boiling Point
Boiling Point
The temperature at which a substance changes from a liquid to a gas.
Phase Change Energy Transfer
Phase Change Energy Transfer
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Freezing
Freezing
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Study Notes
Phase Changes
- Phase change, or a change of state, occurs when matter shifts from one phase (solid, liquid, or gas) to another.
- During a phase change, thermal energy is exchanged with the substance.
- This energy transfer doesn't alter the substance's temperature; only the potential energy (spacing between molecules) changes, not kinetic energy.
Main Phase Changes
- Melting: Solid to liquid; thermal energy absorbed.
- Freezing: Liquid to solid; thermal energy released.
- Vaporization (Boiling): Liquid to gas; thermal energy absorbed.
- Condensation: Gas to liquid; thermal energy released.
Phase Changes of Water
- Each substance has unique melting/freezing and boiling points.
- Water's freezing point is 0°C, and its boiling point is 100°C.
- Melting: Ice (solid) changes to water (liquid) at 0°C, absorbing thermal energy.
- Boiling: Water (liquid) changes to water vapor (gas) at 100°C, absorbing thermal energy.
- Condensation: Water vapor (gas) changes back to water (liquid) at 100°C, releasing thermal energy.
- Freezing: Water (liquid) freezes to ice (solid) at 0°C, releasing thermal energy.
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