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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
Make a list of different types of changes with example.
Write true or false
Cutting of paper into pieces is a chemical change.
What is a physical change ? Give two examples of physical changes.
Classify the following as a physical or a chemical change.
Drying of wet clothes
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
Give the reason why the following is considered as chemical changes.
A bright light is seen evolved when a strip of magnesium is heated.
Give the reason why the following is considered as chemical changes.
A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
Which of the following is a physical change?
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
