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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 statement is true or false. In case a statement is false, write the corrected statement.
Cutting a log of wood into pieces is a chemical change.
Solve this crossword by using the clues that follow.
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1. It is the change that takes place in case of swinging pendulum of a clock.
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change
Fill in the blank.
Growing of a seedling into a plant is _______ change.
State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
Sublimation is classified as a physical change. Why ?
What type of change is colouring of a paper?
Sublimation of Iodine is a ______.
______ is the Universal Solvent.
The change of state of a substance from solid to liquid and liquid to gas is ______.
