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Published byLesley Little Modified over 9 years ago
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Topic: Chemistry Aim: Explain the different types of phase changes.
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Review: 1.Identify the different phases of matter. 2.The particles of a substance are closest together in a _____. 3.The particles of a substance that does not have a definite volume or shape is 4.Identify an example of a physical change. 5.What are 2 physical properties of matter? 6.Give 1 example of a chemical property.
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Phase Changes Involves the absorption or release of heat (energy).
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1. Melting Solid liquid Melting point: temp at which a solid changes to liquid (different for every substance) Substance absorbs heat energy
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2. Freezing Liquid solid Freezing point: temp at which substance changes from liquid to solid Substance loses heat energy
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3. Evaporation LIQUID GAS Liquid absorbs heat energy Liquid gas Boiling point: temp at which liquid boils (d ifferent for every substance)
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4. Condensation Gas liquid LIQUID GAS Gas loses heat energy
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5. Sublimation Solid Gas No liquid phase Ex: dry ice Solid GAS Solid absorbs heat energy
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Freezing L S Melting S L Evaporation L G Condensation G L Add heat Energy absorbed by molecules Remove heat Energy released by molecules PHASE CHANGES SOLIDLIQUID GAS
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Time TEMPTEMP Freezing/melting point = 0°C Boiling pt = 100°C SOLID LIQUID GAS 100°C 0°C Melting Freezing Evaporation Condensation PHASE CHANGE GRAPH FOR WATER = phase changes
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REVIEW: 1. When a liquid becomes a solid, energy ____. 2. ____ is the process in which liquid changes to gas below the boiling point. 3. The change of a liquid to a solid is called__. 4. What happens to the position of water molecules as they lose heat energy? 5. Identify one phase change in which energy is released.
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1. Melting Solid liquid Heat added/absorbed molecules move faster & farther apart Melting point: temp at which a solid changes to liquid (different for every substance) Substance absorbs heat energy
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2. Freezing Liquid solid Liquid heat energy/energy released Molecules slow down & come closer together Freezing point: temp at which substance changes from liquid to solid Substance loses heat energy
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3. Evaporation LIQUID GAS Liquid absorbs heat energy Liquid gas Heat added/absorbed (faster & farther) On surface of liquid evaporation Boiling point: temp at which liquid boils (d ifferent for every substance)
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4. Condensation Gas liquid Gas loses heat energy/energy released (slow down & closer together) LIQUID GAS Gas loses heat energy
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Moth balls commonly undergo the process of sublimation. Sublimation is the process in which a solid changes directly to its gaseous phase, skipping the liquid phase.
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