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The Properties of Gases

Oxygen

Physical Properties
...

Colour Colourless
Odour Odourless
Density compared to air (heavier or lighter) Slightly heavier than air

Chemical Properties
...

Solubility in water Slightly soluble in water
Burning Oxygen gas is needed for burning or combustion. Something that burns in air will burn five times more ferociously in pure oxygen gas.
Moist pH paper No change
Red rose petals No change
Specific test A glowing match or wooden spill will relight when placed in oxygen gas.

Footnotes:

  • Makes up 20% of the gases in the air.
  • Needed by the majority of living organisms for respiration
  • Is produced by green plants as a by-product of photosynthesis;

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