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प्रश्न
Distinguish physical and chemical changes.
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उत्तर
1. Physical changes:
- No new substance is formed
- Reversible
- Change in physical properties like size, shape, state
- Melting of ice, tearing of paper freezing, evaporation vaporization
2. Chemical changes:
- New substance is formed
- Irreversible
- Change in properties of reactants and products
- Burning of paper, photosynthesis, digestion of food, rusting of iron
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संबंधित प्रश्न
Fill in the blank.
Heat is .................... by a gas during the process of condensation.
Write true or false for the statement.
Deforestation is a man-made change
Chemical changes are accompanied by changes in energy.
Classify the following changes as physical or chemical: curdling of milk
Classify the following as physical or chemical change :
Formation of curd from milk
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Given reason:
Burning of paper is a chemical change.
Select the chemical changes from the following list of changes
The carbon cycle.
Select the chemical changes from the following list of changes
Glowing of an electric bulb.
Match the items of Column I with the items of Column II.
| Column I | Column II | ||
| (a) | Large crystals | (i) | Turns lime water into milky |
| (b) | Depositing a layer of zinc on iron | (ii) | Physical change |
| (c) | Souring of milk | (iii) | Rust |
| (d) | Carbon dioxide | (iv) | Sugar candy (Mishri) |
| (e) | Iron oxide | (v) | Chemical change |
| (f) | Dissolving common salt in water | (vi) | Galvanisation |
