The Atmosphere

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# The Atmosphere - PowerPoint PPT Presentation

The Atmosphere. 01/03/12. The Atmosphere. The atmosphere is the layer of gases around the earth These gases are known as air. Air. Do the percentages of the gases ever change in air?. Is the atmosphere heavy?. Does the atmosphere have mass? Is it heavy?. Yes it does

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### The Atmosphere

01/03/12

The Atmosphere
• The atmosphere is the layer of gases around the earth
• These gases are known as air
Air
• Do the percentages of the gases ever change in air?
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?
Filling balloons

CO2

Oxygen

• Which gas is more dense?

Balloon

Test tube

Hydrogen peroxide

0.2g of Manganese dioxide

Oxygen

What is density?

Density= Mass/Volume

Hydrogen peroxide

+

Manganese dioxide

Carbon dioxide balloon

CO2

• 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
Oxygen Balloon

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

Test tube

Hydrogen peroxide

0.2g of Manganese dioxide

Oxygen

Hydrogen peroxide

+

Manganese dioxide

• Manganese dioxide is a catalyst
• A catalyst is a substance that speeds up a chemical reaction but does not get used up
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
Animation of oxygen
• Fill in section B of worksheet based on your observations