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Upper Elementary Science - II
4.21 Reversible and Irreversible Changes

Some changes in nature such as conversion of ice to water and then to vapour are examples of reversible changes. These changes are those in which we can separate the constituents.

While some changes such as burning of paper, burning of candle, etc. are called irreversible changes. These changes are a uni-directional changes.

Some methods used to separate constituents in a reversible change:

  • Some substances that completely dissolve can be separated by heating.
  • Substances that do not dissolve can be separated by filtration.
  • Sieving is another method to separated larger substances from smaller substances.

Directions: Answer the following questions.
Q 1: When sea water is heated salt vapourises.

Q 2: A mixture of flour and husk can be separated by

Q 3: Which of these is an irreversible change
Burning of sugar
Burning of fuels
Burning of paper

Q 4: Burning of candle is an example of

Q 5: Evaporation and freezing of water are examples of reversible changes.

Q 6: When distilled water is heated nothing is left behind.

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