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प्रश्न
When ice melts to form water, change occurs in its
विकल्प
position
colour
physical state
composition
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उत्तर
Physical state
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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
Classify the following changes as physical or chemical:- photosynthesis in plants
Write true or false
Earthquake is a desirable change.
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Classify the Following as a Physical Or a Chemical Change.
Formation of Clouds
Read the paragraph and note down the various types of changes it mentions.
It was nearing six o'clock in the evening. The sun was setting. A breeze was blowing. Leaves on the tree were shaking. Sahil was sitting in the courtyard, rolling balls of wet soil, and shaping them into various toys. Then he felt hungry and went into the house. Mother made a dough from wheat flour and fried purees. While eating hot purees, his attention was drawn outside the window. It had started raining. There was lightning, too. Sahil was enjoying his dinner in the dim light.
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. |
Compare the energy changes involved during a physical and a chemical change.
Iron pipes coated with zinc do not get rusted easily.
Mention some of the different conditions needed for chemical changes to occur.
