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Chapter 20, 21

Revise The Atmosphere

List the 5 gases that air is made up of. Nitrogen, Oxygen, Water vapour, Argon, Carbon Dioxide.
State how much of each of the following gases is present in air Carbon dioxide, Nitrogen and Oxygen. Nitrogen: 78%, Oxygen 21%, Carbon Dioxide <1%
Why does air rise? Because it is heated.
What chemicals do you need to make oxygen gas? Manganese Dioxide and Hydrogen Peroxide.
What is a catalyst? Give an example. A catalyst is something which speeds up a reaction with out getting used in the reaction itself. Manganese Dioxide.
Describe how you test a gas to see if it is oxygen. A small amount in a test tube should relight a glowing splint.
What are the chemicals you need to make Carbon Dioxide gas? Calcium Carbonate (marble chips) and HCL.
How do you test a gas to see if is Carbon Dioxide? A small amount in a test tube should put out a lighted splint.
Describe how to test the pH of carbon dioxide and oxygen. Shake some water in a test tube with the gas you want to test and put a piece of litmus paper in the water. The water will dissolve some of the gas.
Created by: SC Dave



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