1. 01/03/12 The Atmosphere

2. The atmosphere is the layer of gases around the earth These gases are known as air

3. Air  Do the percentages of the gases ever change in air?

4. Is the atmosphere heavy? Does the atmosphere have mass? Is it heavy? Yes it does Yes its weight is equal to a layer of water 10.36m thick surrounding the entire surface of the earth So why doesn't it crush us?

5. Filling balloons Which gas is more dense? CO 2 Oxygen What is density? Density= Mass/Volume Hydrogen peroxide Test tube Balloon 0.2g of Manganese dioxide Hydrogen peroxide + Manganese dioxide Oxygen

6. Carbon dioxide balloon Fill the test tube half way with vinegar Put 3-4 teaspoons of baking soda into a balloon Attach the balloon to the test tube and allow the balloon fill up with gas CO 2

7. Oxygen Balloon Very carefully add two 5ml droppers of hydrogen peroxide to a test tube Carefully weigh 0.2-0.3g of manganese dioxide and add it to a balloon Attach the balloon to the test tube and allow the manganese dioxide to fall into the test tube leave for about 8-10mins to allow the balloon to fill Manganese dioxide is a catalyst A catalyst is a substance that speeds up a chemical reaction but does not get used up Oxygen Hydrogen peroxide Test tube Balloon 0.2g of Manganese dioxide Hydrogen peroxide + Manganese dioxide Oxygen

8. 35mm film canisters Tidy away books and put mat down on desk Fill the canister ¾ full with vinegar Put a full spoon of baking soda onto a small square of j-cloth Wrap the cloth into a parcel Drop the parcel into the vinegar and very quickly put on the lid and turn canister upside down on table Fill in section A of worksheet based on your observations

9. Uses of carbon dioxide Fizzy drinks Fire extinguishers Stage effects

10. Animation of oxygen Fill in section B of worksheet based on your observations