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Evaporation & Condensation

Evaporation & Condensation. You must be able to state that: evaporation is when a liquid turns into a gas condensation is when a gas turns into a liquid You should be able to: describe the conditions that increase the rate of evaporation or condensation .

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Evaporation & Condensation

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  1. Evaporation & Condensation You must be able to state that: • evaporation is when a liquid turns into a gas • condensation is when a gas turns into a liquid You should be able to: • describe the conditions that increase the rate of evaporation or condensation. • Explain how the kinetic energy of particles and attraction between particles relates to evaporation. • explain how evaporation causes cooling. You could be able to apply understanding of the above to other subjects or new situations

  2. Evaporation & Condensation • Video • http://www.youtube.com/watch?v=yyxc-81JDbo&feature=player_embedded#!

  3. There are weak attractive forces between molecules (particles) in a liquid that hold them close together.

  4. (faster moving particles) (slower moving particles) All the molecules in a liquid are moving in random directions but some are moving faster then others (they have more kinetic energy). Only the faster moving molecules have the energy needed to overcome the attractive forces between them and other molecules and escape from the surface of the liquid. If only slow moving molecules are left behind then the liquid is cooler than before.

  5. CONDENSATION Video http://www.youtube.com/watch?v=bymT5AcV-C4&feature=player_embedded

  6. Key Points • Evaporation is when a liquid turns into a gas. • Condensation is when a gas turns into a liquid. • Cooling by evaporation of a liquid is due to the faster moving molecules escaping from the liquid.

  7. Speed it up • How can we speed up evaporation? • How can we speed up condensation?

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