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! Q1)
a)
- The bonds in a solid are very strong and so the particles are held into place. This does not allow any of the particles to freely flow around and they can only vibrate on the spot. Since they are fixed, their shape cannot be altered.
- Liquids and gases can move and slide over each other because their bonds are weaker than a solid. Therefore, they do not keep their shape.
b)
- The particles in a solid and a liquid are closely packed together and therefore, incompressible.
- The particles in a gas are widely spaced and the bonds between them are much more weaker than a solid and liquid, so they can fill their container. Q3)
Boiling:
- Boiling is when you heat up a liquid until the average kinetic energy is enough to turn it into a gas
- This only occurs at a fixed temperature, the boiling point of the liquid
- Boiling happens throughout liquids and is a fast process. Evaporating:
- Happens when a liquid is left open in the air
- Only the particles at the surface of the liquid have the ability to escape from the liquid and into the air
- Evaporation occurs at a range of temperatures. A high temperature would increase the rate of evaporation whereas a low temperature would decrease the rate of evaporation.
- Because most of the energetic particles have been removed, the average kinetic energy decreases and the liquid cools down. 5.7 and 5.8 Experiment - Cooling Curve of Stearic Acid using datalogger 5.7 to 5.10 Plenary 1 · Play the Stage 1 game to test your knowledge of solids, liquids and gases
· Play the Stage 2 game to test your knowledge about changes of phase! 5.7 to 5.10 Plenary 2 Play the Level 1 game to test your knowledge of the properties of solids, liquids and gases
Extension: Play the Level 2 game to extend your knowledge about changes of phase! 
· 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! Q1)
a)
- The bonds in a solid are very strong and so the particles are held into place. This does not allow any of the particles to freely flow around and they can only vibrate on the spot. Since they are fixed, their shape cannot be altered.
- Liquids and gases can move and slide over each other because their bonds are weaker than a solid. Therefore, they do not keep their shape.
b)
- The particles in a solid and a liquid are closely packed together and therefore, incompressible.
- The particles in a gas are widely spaced and the bonds between them are much more weaker than a solid and liquid, so they can fill their container. Q3)
Boiling:
- Boiling is when you heat up a liquid until the average kinetic energy is enough to turn it into a gas
- This only occurs at a fixed temperature, the boiling point of the liquid
- Boiling happens throughout liquids and is a fast process. Evaporating:
- Happens when a liquid is left open in the air
- Only the particles at the surface of the liquid have the ability to escape from the liquid and into the air
- Evaporation occurs at a range of temperatures. A high temperature would increase the rate of evaporation whereas a low temperature would decrease the rate of evaporation.
- Because most of the energetic particles have been removed, the average kinetic energy decreases and the liquid cools down. 5.7 and 5.8 Experiment - Cooling Curve of Stearic Acid using datalogger 5.7 to 5.10 Plenary 1 · Play the Stage 1 game to test your knowledge of solids, liquids and gases
· Play the Stage 2 game to test your knowledge about changes of phase! 5.7 to 5.10 Plenary 2 Play the Level 1 game to test your knowledge of the properties of solids, liquids and gases
Extension: Play the Level 2 game to extend your knowledge about changes of phase!
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