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प्रश्न
Distinguish between the following.
Physical change and chemical change
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उत्तर
| Physical Change | Chemical Change | |
| 1. | The chemical composition of a substance does not change. | The chemical composition of a substance does not remain the same. |
| 2. | Easily reversible | Not easily reversible |
| 3. | No new substance is formed | New substances are always formed |
| 4. | Melting of ice is an example of physical change. | The burning of paper is an example of chemical change. |
संबंधित प्रश्न
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
Write short answer.
Give an example of desirable change which can also be undesirable
State the various conditions that favour the process of evaporation.
Classify the following as physical or chemical changes :
Breaking of a glass tumbler
Which of the following are physical changes ?
- melting of iron metal
- rusting of iron metal
- bending of an iron rod
- drawing a wire of iron metal
Ice kept in a beaker, slowly melts and turns into water. The water in the beaker on solidification is freezing turns back to ice. Give four reasons why the change from ice to water and water back to ice is considered a physical change.
Select the correct answer from the choice given below to complete the sentence
The dissolution of lead nitrate in water is deemed as a _________ change.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
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 |
Explain the characteristics of physical change with examples.
