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प्रश्न
What are reversible and irreversible changes ? Give one example for each.
Change is the law of nature and occur in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Reversible and irreversible change.
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उत्तर
- Reversible change : When a change in a substance can be reversed by changing the conditions, it is said to be a reversible change.
Example : Melting of ghee or wax. - Irreversible change : When a substance can not be brought back to its original state after a change, it is said to be an irreversible change.
Example : Souring of milk.
संबंधित प्रश्न
Classify the following as chemical or physical change:
Boiling of water to form steam.
Changes in which only ______ properties of a substance change are called physical changes.
Melting of solid (wax) is a physical change.
Define physical change. Give two examples for the above changes.
Which of the following are physical changes and which are chemical changes ?
Freezing of water
Classify the Following as a Physical Or a Chemical Change.
Making of a Sugar Solution
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
What is the difference between dissolution of sugar and burning of sugar ?
Natural changes which take place in nature on their own, are beyond the control of human being.
Adding sugar to milk is a physical change.
