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प्रश्न
Changes in which only ______ properties of a substance change are called physical changes.
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उत्तर
Changes in which only physical properties of a substance change are called physical changes.
Explanation:
Physical changes alter only the physical properties, not the chemical composition, of a substance.
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संबंधित प्रश्न
Explain why burning of wood and cutting it into small piece are considered as two different types of changes.
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
Solve this crossword by using the clues that follow.
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1. It is the change that takes place in case of swinging pendulum of a clock.
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change
State four differences between physical and chemical changes.
State whether the following is physical or chemical changes.
cutting wood into small pieces —
Which of the following are physical changes and which are chemical changes ?
Glowing of an electric bulb
Classify the following as a physical or a chemical change.
Drying of wet clothes
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Natural changes which take place in nature on their own, are beyond the control of human being.
