Class 6 Chemistry Changes around us Different Types of Changes

Different Types of Changes

  • Changes can be natural and man-made.
  • Natural changes
    • For example:-
  1. Change in weather
  2. Falling of leaves
  3. Growing of human being.
  • Man Made Changes
    • For Example:-
  1. Hunting of eagles
  2. Burning of paper
  • Changes Can be brought by following causes:-
  1. Force:-
    1. Examples are: - Moulding of Clay, Cutting of Vegetables, Pushing of table etc.
  2. Pressure:-
    1. Examples are:-Blowing of air into tyres, ball, balloon, and food cooked in pressure cooker etc.

Class_6_Chemistry_Changes_Around_Us_Blowing_Of_Air_in_Balloon

  1. Mixing of substances:
    1. Example: - Consider a beaker containing copper sulphate solution and put a bar of magnesium. After some time we will see copper sulphate solution changes to white. A chemical reaction takes place:-

 Mg + CuSO4 --> MgSO4 + Cu

The colour of solution changes to colourless as the colour of magnesium sulphate is colourless and the colour of magnesium bar changes to blue.

Class_6_Chemistry_Changes_Around_Us_Mixing_of_Substances

 

  1. Change can be absorbed in the shape and state of the substances around us.
    1. For Example: - A piece of chocolate is solid until it melts .So its solid form is changing to semi-liquid form.
  2. Changes caused by energy
  3. Energy by provided by light, heat etc.

For example: - Photosynthesis in plants, sugar crystals changing into molten sugar because of heat energy.

Note: - Changes can be temporary or permanent and may be periodic or non-periodic. The changes may be slow or fast, reversible or irreversible.

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