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प्रश्न
Give the main differences between physical changes and chemical changes.
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उत्तर
Important differences between a physical and a chemical change are given below:
| PHYSIAL CHANGE | CHEMICAL CHANGE |
| 1. No new substance is formed. | 1. A new substance is formed. |
| 2. Physical change is reversible. | 2. Chemical change is usually irreversible. |
| 3. It is a temporary change. | 3. It is a permanent change. |
| 4. No heat energy is evolved or absorbed. | 4. Heat energy is evolved or consumed in a large amount. |
| 5. Examples: Melting of ice, formation of clouds, tearing of cloth etc. | 5. Examples: Rusting of iron, ripening of fruits, cooking of food etc. |
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संबंधित प्रश्न
Write short answer.
Name two reversible changes.
What are reversible and irreversible changes ? Give one example for each.
State whether the following is physical or chemical changes.
Slaking of lime —
Differentiate between a physical change and a chemical change with reference to – Formation of products.
Fill in the blank with the correct word of the statement given below:
Sublimation involves a __________ change.
State which of the following pertain to – chemical changes.
- Substance retains its identity.
- The change is permanent.
- No new substance is formed.
- Is easily reversible.
- Produces one or more new substances by a change in its composition.
- The change is temporary.
- The composition and properties of the original substance are not altered.
Compare the energy changes involved during a physical and a chemical change.
What is the difference between dissolution of sugar and burning of sugar ?
State whether the following statement is true or false:
Stretching of rubber bands is not a physical change.
Adding sugar to milk is a physical change.
