OXYGEN
- Created by: olivialcock
- Created on: 25-08-16 12:10
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- OXYGEN
- % OF OXYGEN IN THE AIR
- Copper Experiment
- Method
- 1.100cm3 of air is put in one syringe
- 2. The syringe plungers are moved in and out so that all of the air is passed over the hot copper
- Observations
- Air is passes backwards and forwards across the hot copper and the volume of air decreases
- This is because when copper is heated, it reacts with oxygen in the air to make copper (II) oxide - so the reaction uses up oxygen
- Therefore the volume of air decreases by about 20% (% of oxygen in the air)
- This is because when copper is heated, it reacts with oxygen in the air to make copper (II) oxide - so the reaction uses up oxygen
- Air is passes backwards and forwards across the hot copper and the volume of air decreases
- Method
- Iron or Phosphorus Experiment
- Method
- 1. Soak some iron wool in acetic acid and push the wool into a test tube
- CATALYST = Acetic acid
- 2. Invert the tube into a beaker of water
- 1. Soak some iron wool in acetic acid and push the wool into a test tube
- Observations
- Over time the level of water in the test tube will rise
- This is because the iron reacts with the oxygen in the air to make iron oxide
- The water rises fill the spacto e the oxygen took up
- This is because the iron reacts with the oxygen in the air to make iron oxide
- Over time the level of water in the test tube will rise
- % of oxygen = vol of air used // vol of air at start x100
- Method
- Copper Experiment
- MAKING OXYGEN
- Pure oxygen can be made from hydrogen peroxide (H2O2)
- Hydrogen peroxide will decompose into water and oxygen
- The decomposition is really slow but the rate of the reaction can be increased with a catalyst
- CATALYST = Manganese oxide (MnO2)
- The decomposition is really slow but the rate of the reaction can be increased with a catalyst
- Collection?
- Over water
- Using a gas syringe
- REACTIONS WITH OXYGEN IN AIR
- MAGNESIUM
- WHAT'S PRODUCED? a white powder called magnesium oxide
- FLAME? bright white
- Magnesium oxide is slightly alkaline (when dissolved in water)
- SULFUR
- WHAT'S PRODUCED? sulfur dioxide gas
- FLAME? pale blue
- Sulfur dioxide is acidic (when dissolved in water)
- burns in oxygen or air
- CARBON
- FLAME? yellow/orange
- WHAT'S PRODUCED? carbon dioxide gas
- Carbon dioxide is slightly acidic (when dissolved in water)
- burns in air if its very strongly heated
- MAGNESIUM
- % OF OXYGEN IN THE AIR
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