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प्रश्न
Fill in the blank
Revolution of the earth around the sun is a ________ change.
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उत्तर
Revolution of the earth around the sun is a natural periodic change.
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संबंधित प्रश्न
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
Tick (√) the correct alternative from the choice given for the following statement.
An example of both physical and chemical change is
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
Give the main differences between physical changes and chemical changes.
Classify the Following as a Physical Or a Chemical Change.
Making of a Sugar Solution
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
Match the examples of changes in List I with the correct.
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | |
| 4. Tarnishing of copper | |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. |
Name the following.
The gaseous product of the chemical change which takes place during respiration in living organisms.
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 |
Iron pipes coated with zinc do not get rusted easily.
