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प्रश्न
True or false
In a physical change no net energy change is involved.
विकल्प
True
False
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उत्तर
True
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संबंधित प्रश्न
Classify the following changes as physical or chemical:-boiling
State whether the following is physical or chemical changes.
burning of sugar —
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
State whether the following is physical or chemical changes.
cutting wood into small pieces —
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.
Classify the following as physical or chemical change :
Condensation of steam
Given reason:
Burning of paper is a chemical change.
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
When solute is dissolved in a solvent it forms a solution.
Adding sugar to milk is a physical change.
