Oxygen (8)

  1. Oxygen is the most abundant chemical element by mass in the Earth’s biosphere, air, sea and land.
  2. Oxygen constitutes 49.2% of the Earth’s crust by mass.
  3. Oxygen gas is the second most common component of the Earth’s atmosphere, taking up 20.8% of its volume and 23.1% of its mass.
  4. Highly reactive non-metallic element and oxidizing agent that readily forms compounds (notably oxides) with most elements.
  5. At standard temperature and pressure, oxygen is colorless, odorless gas with thermolecular formula O2.
  6. Liquid oxygen is attracted to a magnet to a sufficient extent that a bridge of liquid oxygen may be supported against its own weight between the poles of powerful magnet.
  7. A metallic phase was discovered when oxygen is subjected to a pressure of above 96 GPa.
  8. The solubility of oxygen in water is temperature-dependent, and about twice as much (14.6mg/L) dissolves at O°C than at 20°C (7.6mg/L)
  9. Oxygen condenses at -182.95°C or liquefies at -185°C and freezes at -218.79°C.
  10. Three stable isotopes: O-16, O-17, O-18, with O-6 being the most abundant (99.762% natural abundance).
  11. Photosynthesis:
  12. CO2 + H2O + Sun Light (Photons) → Glucose (C2H12O6) + DiOxygen (O2)

    1. Oxygen is used medically for patients who require mechanical ventilation, often at concentrations above the 21% found in air.
    2. The air is liquefied at -200°C.