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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

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: Evaporation and freezing of water are examples of reversible changes.
False
True

Q 2: A mixture of salt and water can be separated by
Heating
Freezing
Condensation
Cooling

Q 3: A mixture of saw dust in water can be separated by
Distillation
Sieving
Filtration
Freezing

Q 4: When sea water is heated salt vapourises.
False
True

Q 5: Burning of candle is an example of
Freezing
Sublimation
Distillation
Condensation

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

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Question 8: This question is available to subscribers only!


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