© boardworks ltd 2004 1 of 20 © boardworks ltd 2005 1 of 25 ks3 chemistry 7g solids, liquids and...

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KS3 Chemistry

7G Solids, Liquids and Gases



Properties of solids, liquids and gases

Summary activities

Diffusion

Introducing states of matter

The particle model

Contents


Three states of matter

solid liquid gas

At room temperature most substances exist in one of three physical states.


Solid, liquid or gas?




Summary activities

Diffusion


The particle model

Contents


The particle model

The difference between solids, liquids and gases can be explained by the…

All substances are made up of particles.

The particles are attracted to each other. Some particles are attracted strongly to each other and others weakly.

The particles move around. They are described as having kinetic energy.

The kinetic energy of the particles increases with temperature.


Particles in a solid – animation


Particles in a liquid – animation


Particles in a gas – animation




Summary activities

Diffusion


The particle model

Contents


Which state of matter am I?




Summary activities

Diffusion


The particle model

Contents


How do smells spread out?

Where is the smell coming from and how does it spread out?


Diffusion occurs in liquids and gases but hardly at all in solids.

What is diffusion?

Diffusion is the movement of particles that allows them to spread out and mix with other particles.

For example, the smell of aftershave or perfume diffuses and is detected by people on the other side of the room.

Use the particle model to explain these facts about diffusion:

Diffusion happens more quickly for gases than for liquids.

Diffusion happens more quickly at warm temperatures than at cooler temperatures.




Summary activities

Diffusion


The particle model

Contents


Glossary

gas – The state of matter in which particles move quickly in all directions and rarely touch each other.

liquid – The state of matter in which particles are randomly arranged and touch each other.

matter – The stuff that everything is made of.

particle – The smallest unit of matter.

solid – The state of matter in which particles are in a fixed arrangement and touch each other.


Anagrams


Across:

2. Change from liquid to solid

5. Force caused by collisions of particles

6. Arranged in a 3-dimensional pattern

9. Spacing of particles in solids and liquids

10. All substances are this state at very low temperatures

11. Only liquids and gases do this

1

2 3

4

5

6

7 8

9

10

11

Down:

1. Closely packed particles 6. Particles are close but disorganised

3. Change from gas to liquid 7. Particles widely spread out

4. Change from solid to liquid 8. Change from liquid to gas

Crossword


Multiple-choice quiz

© boardworks ltd 2004 1 of 20 © boardworks ltd 2005 1 of 25 ks3 chemistry 7g solids, liquids and...

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