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Phase Changes. Phase Change Phase Change: Reversible physical change that occurs when substance changes from one state to another Energy is either released.

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Presentation on theme: "Phase Changes. Phase Change Phase Change: Reversible physical change that occurs when substance changes from one state to another Energy is either released."— Presentation transcript:

1 Phase Changes

2 Phase Change Phase Change: Reversible physical change that occurs when substance changes from one state to another Energy is either released or absorbed during phase changes

3 1. Melting Phase change from Solid to liquid –Energy is absorbed by substance Heat of fusion: amount of heat energy needed to melt a substance –Varies for different substances

4 Melting ice Melting iron

5 2. Freezing Phase change from liquid to solid –Energy is released from substance Ex: Milk to ice cream

6 3. Vaporization Phase change from a liquid to a gas –Energy is absorbed by substance Heat of Vaporization: amount of heat energy required to change a substance from a liquid to gas –varies for different substances

7 Vaporization (2 Types) 1. Evaporation: Change from liquid to gas at temperatures below the substance’s boiling point –Ex: Evaporating water from ocean 2. Boiling: Change from liquid to gas at the substance’s boiling point.

8 4. Condensation Phase change from gas to liquid –Energy is released from substance

9 5. Sublimation Phase change from solid directly to gas (skips liquid phase) Energy is absorbed by substance –Ex: Dry ice (solid CO 2 )

10 6. Deposition Change from gas directly to solid Energy is released by substance –Ex: Frost on car windows


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