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प्रश्न
State whether the following is physical or chemical changes.
photosynthesis —
उत्तर
chemical change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Cutting of trees
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
Fill in the blank.
Heat is .................... by a gas during the process of condensation.
What role does energy play in initiating a chemical change ?
State three differences between evaporation and boiling
State whether the following is physical or chemical changes.
shaping a piece of glass —
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
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 product obtained during a physical change when water converts from a liquid into a solid.
In a solution of salt in water, water is the solute
