The document provides information about the states of matter - solids, liquids, and gases. It explains that all substances are made up of particles and the key difference between the three states is how strongly the particles are attracted to each other and how much they move. Solids have particles that are strongly attracted and do not move around much. Liquids have particles that are less strongly attracted and can move past each other. Gases have particles that move freely and are rarely touching. The document also discusses diffusion, which is the spreading out of particles, and provides examples of how smells diffuse through the air or liquids.

1. KS3 Chemistry 7G Solids, Liquids and Gases

2. Contents 7G Solids, Liquids and Gases Properties of solids, liquids and gases Summary activities Diffusion Introducing states of matter The particle model

3. Different substances What different types of materials are there? M ercury A luminium T in E thanol R adium I ron A rgon L ead Aluminium Lead Argon Iron Radium Ethanol Tin Mercury What are the names of the substances described in this table? (The first letters spell out another word for ‘substance’.) Solid used by Roman plumbers Unreactive gas Solid that rusts Radioactive solid Intoxicating liquid Solid used to coat steel cans Solid used in aircraft Liquid metal

4. Three states of matter solid liquid gas At room temperature most substances exist in one of three physical states.

5. Solid, liquid or gas?

6. Solid, liquid or gas?

7. Contents 7G Solids, Liquids and Gases Properties of solids, liquids and gases Summary activities Diffusion Introducing states of matter The particle model

9. Particles in a solid – animation

10. Particles in a liquid – animation

11. Particles in a gas – animation

12. Contents 7G Solids, Liquids and Gases Properties of solids, liquids and gases Summary activities Diffusion Introducing states of matter The particle model

13. Properties of solids, liquids and gases

14. Which state of matter am I?

15. Contents 7G Solids, Liquids and Gases Properties of solids, liquids and gases Summary activities Diffusion Introducing states of matter The particle model

16. How do smells spread out? Where is the smell coming from and how does it spread out?

18. Diffusion animation 1

19. Diffusion animation 2

21. Contents 7G Solids, Liquids and Gases Properties of solids, liquids and gases Summary activities Diffusion Introducing states of matter The particle model

22. Glossary  diffusion – Particles spreading out and mixing in the gas or liquid state.  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.  pressure – The f orce produced when particles move against a surface.  solid – The state of matter in which particles are in a fixed arrangement and touch each other.

23. Anagrams

25. Multiple-choice quiz