Answers - Corrections to questions

Cheers,

Mr B

5.9 and 5.10 answers

28 October 2011

10:21

5.7 and 5.8 Starter answers

28 October 2011

11:00

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What are the 6 processes shown by the arrows?

		Melting
	Boiling

5.7 and 5.8 Answers

28 October 2011

10:20

·         Collins p.112

1a

·         Particles in a solid are strongly bonded to each other so their particles are held in a fixed, regular pattern and can not move

·         The bonds between particles in liquids and gases are weaker and therefore their particles can move relative to each other

 

1b

·         The particles in solids and liquids are closely packed and they are therefore incompressible

·         The particles in a gas are very widely spaced and the forces between them are very weak so they can spread out to fill their container

Boiling

·         Boiling occurs when you heat a liquid until the average energy of the particles is great enough for them to turn into a gas

·         Boiling occurs at a fixed temperature called the boiling point

·         Boiling occurs throughout a liquid

·         It is a fast process

·         

 

Evaporation

·         Evaporation occurs when a liquid is left open to the air

·         Only particles at the surface of the liquid that have enough energy can escape the liquid into the air

·         Evaporation occurs for a range of temperatures; high temperatures increase evaporation, low temperatures decrease evaporation

·         Evaporation only occurs from the surface of a liquid

·         It is a slower 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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