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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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Description
Explore the concept of phase changes in matter, including melting, freezing, vaporization, and condensation. This quiz focuses on the energy transfer involved in these processes and the specific phase change points for water. Test your knowledge of how substances transition between solid, liquid, and gas states.
