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CONSTITUENTS OF AIR

Air is a mixture of gases, composed mainly of nitrogen and oxygen with small amounts of Carbon (iv) oxide, noble gases and water vapour. The constituents of air can be separated easily by physical methods. Nitrogen accounts for about 4/5 of the atmosphere by volume, while oxygen occupies the remaining 1/5

Percentage Composition

The chief natural constituents of air and their percentage composition by volume are as follow:

PROPERTIES OF AIR

  1. Water vapour in air: The presence of water vapour or moisture in the atmosphere is due to the evaporation of water from the oceans, rivers, lakes, sea and water reservoirs. The amount present in air varies with temperature, the prevailing weather and the position of the place.
  2. Noble gases in air: Argon is the most abundant of the bobble gases in the air, then neon. Noble gases are generally in reactive. They are used to produce colourful light for advertisement.
  3. Carbon (iv) oxide air: The presence of carbon (iv) oxide in air can be proved by the passage of air through aqueous solution of calcium hydroxide (lime water) or KOH.

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Lesson tags: Chemistry Lesson Notes, Chemistry Objective Questions, SS2 Chemistry, SS2 Chemistry Evaluation Questions, SS2 Chemistry Evaluation Questions First Term, SS2 Chemistry First Term, SS2 Chemistry Objective Questions, SS2 Chemistry Objective Questions First Term
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