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© Boardworks Ltd 2004 1 of 20 © Boardworks Ltd 2005 1 of 25 KS3 Chemistry Solids, Liquids and Gases.

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Presentation on theme: "© Boardworks Ltd 2004 1 of 20 © Boardworks Ltd 2005 1 of 25 KS3 Chemistry Solids, Liquids and Gases."— Presentation transcript:

1 © Boardworks Ltd of 20 © Boardworks Ltd of 25 KS3 Chemistry Solids, Liquids and Gases

2 © Boardworks Ltd of 20 © Boardworks Ltd of 25 7G Solids, Liquids and Gases Properties of solids, liquids and gases Summary activities Diffusion Introducing states of matter The particle model Contents

3 © Boardworks Ltd of 20 © Boardworks Ltd of 25 What different types of materials are there? Liquid metal Solid used in aircraft Solid used to coat steel cans Intoxicating liquid Radioactive solid Solid that rusts Unreactive gas Solid used by Roman plumbers M Mercury A Aluminium T Tin E Ethanol R Radium I Iron A Argon L Lead Different substances AluminiumLead ArgonIron RadiumEthanol TinMercury What are the names of the substances described in this table? (The first letters spell out another word for substance.)

4 © Boardworks Ltd of 20 © Boardworks Ltd of 25 Three states of matter solid liquid gas At room temperature most substances exist in one of three physical states.

5 © Boardworks Ltd of 20 © Boardworks Ltd of 25 Solid, liquid or gas?

6 © Boardworks Ltd of 20 © Boardworks Ltd of 25 Solid, liquid or gas?

7 © Boardworks Ltd of 20 © Boardworks Ltd of 25 7G Solids, Liquids and Gases Properties of solids, liquids and gases Summary activities Diffusion Introducing states of matter The particle model Contents

8 © Boardworks Ltd of 20 © Boardworks Ltd of 25 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.

9 © Boardworks Ltd of 20 © Boardworks Ltd of 25 Particles in a solid – animation

10 © Boardworks Ltd of 20 © Boardworks Ltd of 25 Particles in a liquid – animation

11 © Boardworks Ltd of 20 © Boardworks Ltd of 25 Particles in a gas – animation

12 © Boardworks Ltd of 20 © Boardworks Ltd of 25 7G Solids, Liquids and Gases Properties of solids, liquids and gases Summary activities Diffusion Introducing states of matter The particle model Contents

13 © Boardworks Ltd of 20 © Boardworks Ltd of 25 Properties of solids, liquids and gases

14 © Boardworks Ltd of 20 © Boardworks Ltd of 25 Which state of matter am I?

15 © Boardworks Ltd of 20 © Boardworks Ltd of 25 7G Solids, Liquids and Gases Properties of solids, liquids and gases Summary activities Diffusion Introducing states of matter The particle model Contents

16 © Boardworks Ltd of 20 © Boardworks Ltd of 25 How do smells spread out? Where is the smell coming from and how does it spread out?

17 © Boardworks Ltd of 20 © Boardworks Ltd of 25 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.

18 © Boardworks Ltd of 20 © Boardworks Ltd of 25 Diffusion animation 1

19 © Boardworks Ltd of 20 © Boardworks Ltd of 25 Diffusion animation 2

20 © Boardworks Ltd of 20 © Boardworks Ltd of 25 When the gases meet, they react to form a ring of ammonium chloride which is closer to one end of the tube than the other. cotton wool soaked in ammonia solution cotton wool soaked in concentrated hydrochloric acid Which gas particles diffuse faster, ammonia or acid, and why? By the time the gases meet, the ammonia particles have travelled further down the tube so they must have diffused at a faster speed. Diffusion experiment In this experiment, two gases diffuse towards each other in a sealed glass tube. gases meet here

21 © Boardworks Ltd of 20 © Boardworks Ltd of 25 7G Solids, Liquids and Gases Properties of solids, liquids and gases Summary activities Diffusion Introducing states of matter The particle model Contents

22 © Boardworks Ltd of 20 © Boardworks Ltd of 25 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 force 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 © Boardworks Ltd of 20 © Boardworks Ltd of 25 Anagrams

24 © Boardworks Ltd of 20 © Boardworks Ltd of 25 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 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

25 © Boardworks Ltd of 20 © Boardworks Ltd of 25 Multiple-choice quiz


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