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1. Which materials from the following list are solids? Wood, water, iron, air, oil, oxygen. (lesson9a)
2. Name the liquids from the list in question 1. (9a)
3. Name the gases from the list in question 1. (9a)
4. What happens to the length of a piece of wire when it gets hot. (9b)
5. A solid turns to a liquid at its ------- -----. (9b)
6. When a liquid ------- it turns into a solid. (9b)
7. What are the percentages of the two main gases in the air. (9c)
8. Name the heaviest gas and the lightest gas from the following list. Carbon dioxide, oxygen, helium, nitrogen. (9c)
9. What happens to a glowing spill in a test tube full of oxygen. (9c)
10. Solids, liquids and gases are all made up of tiny particles, but they are arranged differently. Which particles have most space between them? (9d)
11. Which is easiest to compress? A solid, liquid or a gas? (9d)
12. Describe the way particles in a solid, liquid and a gas move. (9e)
13. When the particles of two substances mix without being shaken or stirred, it is called ---------. (9e)
14. What do we call a solid that does not dissolve? (9f)
15. What happens to the particles in a solid when it dissolves in water? (9f)

ANSWERS

1. Wood and iron.
2. Water and oil.
3. Air and oxygen.
4. It gets longer, (expands).
5. Melting point.
6. Freezes.
7. Nitrogen 78%, oxygen 21%
8. Heaviest - carbon dioxide. Lightest - helium.
9. It re-lights.
10. Particles of a gas.
11. A gas.
12. Solid - The particles do not move around but they vibrate. Liquid - The particles move around over and between each other. Gas - The particles move around quickly in all directions.
13. Diffusion.
14. Insoluble.
15. The particles in the solid are separated from each other and spread throughout the water.