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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:
Cutting of trees
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Which of the following are chemical changes?
- Growth of a plant
- Rusting of iron
- Mixing of iron fillings and sand
- Cooking of food
- Digestion of food
- Freezing of water
- Burning of candle
Explain why burning of wood and cutting it into small piece are considered as two different types of changes.
Fill in the blank.
A new substance is formed in a ............... change.
The rusting of an iron object is called :
Fill in the blank with the correct word of the statement given below:
Sublimation involves a __________ change.
Select the chemical changes from the following list of changes
Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.
Give the reason why the following is considered as chemical changes.
An iron nail kept open in the atmosphere rusts.
The change of state of a substance from solid to liquid and liquid to gas is ______.
