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Chapter 20, 21
Revise The Atmosphere
Question | Answer |
---|---|
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. |