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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
Explain the following giving an example.
Pure substance
State whether the following is physical or chemical changes.
cutting wood into small pieces —
True or false
Dissolving of a solid in liquid is a physical change.
Write true or false
Burning of paper and formation of curd are reversible changes.
Name two reversible changes.
Which of the following are physical changes and which are chemical changes ?
Glowing of an electric bulb
Fill in the blank.
A change, which alters the composition of a substances, is known as a___________ change.
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
Gas exists in three states as solid, liquid, and gas.
