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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
Classify the following as chemical or physical change:
Dissolving common salt in water.
Write true or false for the statement.
Burning of paper and formation of curd are reversible changes
Melting of solid (wax) is a physical change.
State whether the following is physical or chemical changes.
glowing of a bulb -
A physical change is temporary. Explain.
Select the chemical changes from the following list of changes
Drying of a fruit
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
Natural changes which take place in nature on their own, are beyond the control of human being.
______ is the Universal Solvent.
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
