1. © OUP: To be used solely in purchaser’s school or college 7G Particle model of solids, liquids and gases What is the world made of? Solids, liquids and gases The particle model 7G Particle model of solids, liquids and gases

2. © OUP: To be used solely in purchaser’s school or college What is the world made of? 7G Particle model of solids, liquids and gases

3. © OUP: To be used solely in purchaser’s school or college Solids, liquids and gases 7G Particle model of solids, liquids and gases

4. © OUP: To be used solely in purchaser’s school or college 7G Solids, liquids and gases - It’s a matter of fact! There are 3 states of matter… Matter is all the stuff around you – everything you can touch, see or smell. Everything in the Universe is made of matter.

5. © OUP: To be used solely in purchaser’s school or college 7G Solids, liquids and gases - It’s a matter of fact!

6. © OUP: To be used solely in purchaser’s school or college SolidLiquidGas Petrol - oxygen - cooking oil - Wood - iron - water - Air - Milk - Nitrogen - Pencil - Glass Classify the following substances as a solid, a liquid, or gas :-

7. © OUP: To be used solely in purchaser’s school or college

8. 7G Solids, liquids and gases - In a state! solidliquidgas fixed shape fixed volume Fill in the table with the answers to these testing questions: Does it have a fixed shape? Does it have a fixed volume?

9. © OUP: To be used solely in purchaser’s school or college 7G Solids, liquids and gases - In a state! solidliquidgas Is it easy to squash? Does it conduct heat well? Can it spread out? Can it stretch? Is it heavy for its size? Now answer some more testing questions about a solid, a liquid and a gas.

10. © OUP: To be used solely in purchaser’s school or college The particle model 7G Particle model of solids, liquids and gases

11. © OUP: To be used solely in purchaser’s school or college 7G The particle model – Solids, liquids and gases The particle model of matter describes: how particles are arranged how much energy particles have and how they move In some matter the particles are held together by forces of attraction. Use the particle model to decide if the forces of attraction are strong, weak or do not exist.

12. © OUP: To be used solely in purchaser’s school or college The particle model of a solid 7G The particle model – Solids, liquids and gases

13. © OUP: To be used solely in purchaser’s school or college 7G The particle model – Solids, liquids and gases The particle model of a liquid

14. © OUP: To be used solely in purchaser’s school or college 7G The particle model – Solids, liquids and gases The particle model of a gas

15. © OUP: To be used solely in purchaser’s school or college 7G The particle model – Solids, liquids and gases solid particles… - are very close together in a fixed arrangement - have a small amount of energy - vibrate but do not move liquid particles… - are close together but have no fixed arrangement - more energy than solid particles - vibrate and can move about gas particles - are far apart and have no fixed arrangement - have a large amount of energy - move rapidly in all directions

16. © OUP: To be used solely in purchaser’s school or college 7G The particle model – Changing state Water can be a solid, liquid or a gas. Its state depends on how much energy the water particles have. If enough energy is added to or removed from the particles a change of state can occur. ice water steam

17. © OUP: To be used solely in purchaser’s school or college 7G The particle model – Changing state Match the change of state to the correct arrow on the diagram. freezing condensing melting evaporating What happens to the particles during each change of state? CLUE: Think about their energy, their movement and the distance between them. ice water steam

18. © OUP: To be used solely in purchaser’s school or college 7G The particle model – True or false? True or False? 1. The particles in gas have a large amount of energy. 2. The particles in a solid have no forces of attraction between them. 3. The particles in a liquid are close together and have a fixed arrangement. 4. When a liquid freezes it becomes a gas. 5. Evaporation describes the change from a liquid to a gas. 6. When a liquid loses energy it becomes a gas. 7. A gas condenses to a liquid when its particles lose energy. 8. When the particles in a solid gain energy the solid melts. TRUE FALSE TRUE FALSE TRUE