Seb Physics: 5.7 and 5.8

· What are the 6 processes shown by the arrows?
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Solid --> Liquid: Melting
Liquid --> Gas: Boiling
Gas --> Liquid: Condensing
Liquid --> Solid: Freezing
Solid --> Gas: Desublimation/ Deposition
Gas --> Solid: Sublimation

5.7 and 5.8

· 5.7 understand that a substance can change state from solid to liquid by the process of melting
· 5.8 understand that a substance can change state from liquid to gas by the process of evaporation or boiling
· Questions from Collins p.112
· Answer in Bullet Points!

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· Use following pages from Collins as a resource to help you

Q1 a) -Particles in solids are stronger and fixed together
-Gases and liquids have a weaker bond between particles
b) -The particles in liquids and solids are closer together and more compact than the particles in a gas
-The particles in gases are weak so they can move around freely and spread out to fill their container

Q3)
Boiling=
-Done by humans and the liquid needs to be heated up to their boiling point
-Boiling happens quickly
-Boiling occurs throughout a liquid

Evaporation=
-Evaporation happens naturally when a liquid is left in the open air
-Only the particles on top evaporate because they have enough energy
-Evaporation doesnt need a fixed temperature (liquid doesnt need a boiling point)
-It is a slow process
-Because it removes the most energetic particles from a liquid the average energy of the remaining particles is decreased and the liquid cools down

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5.7 and 5.8 Experiment - Cooling Curve of Stearic Acid using datalogger

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