Unit 20 - The Atmosphere
Learning Outcomes:
- Understand that air is a mixture of gases, and state the composition of air 78% N2 and 21% O2, with CO2, water vapour and other gases making up the balance) (OC21)
- Show that approximately one fifth of the air is oxygen; show that there is CO2 and water vapour in air (OC22)
- Show that air has mass and occupies space (OP22)
- Understand that the atmosphere exerts pressure and that atmospheric pressure varies with height (OP13)
- Investigate the reaction between zinc and HCl, and test for hydrogen (word equation and chemical equation) (OC51)
- Prepare a sample of oxygen by decomposing H2O2 using MnO2 as a catalyst (word equation and chemical equation) (OC24)
- Investigate the ability of oxygen to support combustion in a wooden splint and a candle, and state two uses of oxygen (OC25)
- Prepare carbon dioxide (word equation and chemical equation), and show that it does not support combustion (OC27)
- Carry out simple tests on carbon dioxide involving its reaction with limewater (word equation and chemical equation), and with moist litmus paper (OC28)
- Investigate the density of carbon dioxide relative to air (qualitative only), and state two uses of carbon dioxide (OC29)
- Use cobalt chloride paper or anhydrous copper sulfate to test for water (OC14)
- Investigate the de-composition of water by electrolysis; recall the composition of water (OC34)
- Describe the chemical effect of an electric current (OP53)
- Demonstrate and describe what happens when (i) a wooden splint and (ii) a piece of magnesium are burned in air (OC23)
- Burn carbon and magnesium in oxygen, and test the products using moist litmus paper (OC26)
The Atmosphere above usWe live in an ocean of air
Properties of OxygenOxygen supports combustion
Air has MassScience is fun !
Climate Change Yes? or No? |
The Gas TestsThree mandatory experiments demonstrated
What percentage is Oxygen ?Another mandatory experiment
Carbon dioxideA reminder of this gas's properties
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