Types of Changes in Nature
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Questions and Answers

What is meant by a reversible change?

  • A change that occurs only in living things
  • A change that occurs only in non-living things
  • A change that cannot be reversed
  • A change that can be reversed by reversing the conditions (correct)

    • The curdling of milk is a reversible change.

    False

    What is an example of a reversible change?

    The melting of ice into water and the freezing of water into ice

    The growth of plants and animals is an example of a/an __________ change.

    <p>irreversible</p> Signup and view all the answers

    Match the following examples with their types of changes:

    <p>Melting of ice = Reversible change Curdling of milk = Irreversible change Growth of plants = Irreversible change Freezing of water = Reversible change</p> Signup and view all the answers

    What happens when sugar is heated?

    <p>It forms a black mass</p> Signup and view all the answers

    All changes in the state of matter are irreversible.

    <p>False</p> Signup and view all the answers

    What is an example of an irreversible change?

    <p>The burning of coal or wood</p> Signup and view all the answers

    Study Notes

    Types of Changes

    • Changes are classified into two categories: Reversible and Irreversible Changes
    • Reversible changes are those that can be reversed by changing the conditions

    Reversible Changes

    • Examples: melting of ice, freezing of water, vaporisation of water, condensation of water vapour
    • Ice melts on being heated and water freezes on being cooled
    • Changes in state of matter are reversible
    • Examples: glowing of an electric bulb, heating of an electric iron or a heater
    • The glow of the bulb vanishes and the iron cools when the electric current or heater is switched off

    Irreversible Changes

    • A change is said to be irreversible when it cannot be reversed by changing the conditions
    • Examples: curdling of milk, charring of sugar, burning of coal, wood, paper or kerosene
    • Milk can be changed into curd, but curd cannot be changed back into milk
    • Charred sugar cannot be changed back into original sugar even when cooled
    • Other examples: photosynthesis in plants, digestion of food in our body, clotting of blood, growth of plants and animals

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    Description

    Learn about the different types of changes that occur in nature, including reversible and irreversible changes, and how they can be classified.

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