E chapter 9 changes matter part2
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The document defines and provides examples of different physical changes of state: melting, evaporation, condensation, freezing, and sublimation. It states that melting, evaporation, condensation, and freezing are reversible processes, while sublimation is irreversible. These changes in state from solid to liquid to gas are considered physical changes because they only alter the form of the substance without changing its chemical composition. The document also defines melting point, boiling point, and freezing point using the example of water.
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E chapter 9 changes matter part2
- 2. Melting : It is the process of changing solid to liquid by heating.
- 3. Evaporation It is the process of changing liquid to vapour by heating
- 4. Condensation It is the process of changing vapour to liquid by cooling .
- 5. Freezing It is the process of changing liquid to solid by cooling.
- 6. Sublimation It is the process of changing solid to gas by heating.
- 7. What do u think which process will be reversible and which will be irreversible?
- 8. Reversible: Melting. Evaporation. Condensation. Freezing.
- 10. What do u think this change in state called? Physical change :Why? -Change in the form of an object without changing what type of matter it is. -Change in the shape.
- 11. Melting point Temperature at which substance melts. o Example : Pure water melts at 0 C.
- 12. Boiling point Temperature at which substance boils. o Example: Pure water melts at 100 C.
- 13. Freezing point Temperature at which substance freezes. o Example : Pure water freezes at 0 C.