Oxygen
Laboratory Preparation of Oxygen
- Heating Potassium Manganate (VII)
2 KMnO4 (s) -> K2MnO4 (s) + MnO2 (s) + O2 (g)
purple -> green + black + colourless
- Decomposing hydrogen peroxide by a catalyst of manganese (IV) oxide
2 H2O2 (l) -> 2 H2O (l) + O2 (g)
Industrial Uses of Oxygen
- Steel making
- In oxy-acetylene welding
- In hospitals and ambulances for treatment of trauma patients
- In rockets to combine with the fuel
- In deep sea diving helium-oxygen mixtures
- Compressed air is avoided in deep sea diving because the nitrogen causes ‘nitrogen narcosis’ when the diver surfaces too rapidly and the nitrogen bubbles out of the blood due to the rapid decrease in