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Questions and Answers
What is meant by a reversible change?
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.
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Match the following examples with their types of changes:
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What happens when sugar is heated?
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All changes in the state of matter are irreversible.
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What is an example of an irreversible change?
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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.
