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प्रश्न
Which of the following are physical changes and which are chemical changes ?
Glowing of an electric bulb
विकल्प
Physical change
Chemical change
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उत्तर
Glowing of electric bulb – Physical 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 most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Is a change of state of matter – a physical or a chemical change. Give reasons.
Select the correct answer from the choice given below to complete the sentence
The matter is added or removed during a ____________ change.
In a solution of salt in water, water is the solute
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
State whether the following statement is true or false:
Stretching of rubber bands is not a physical change.
Cutting a log of wood into pieces is a chemical change.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
