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प्रश्न
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
पर्याय
physical change that can be reversed.
chemical change that can be reversed.
physical change that cannot be reversed.
chemical change that cannot be reversed.
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उत्तर
physical change that can be reversed.
Explanation:
Mixing of sugar in water is a physical change and crystals of sugar can be separated from a supersaturated solution hence it is a reversible change.
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संबंधित प्रश्न
True or false
Is the process of digestion a physical change?
A physical change is temporary. Explain.
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.
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Rotting of eggs.
Select the correct answer from the choice given below to complete the sentence
The energy required for completion of a physical change is ______________ when the change is reversed.
Filling up a balloon with hot air is a _______ change.
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A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.
| Sr. No. | Physical changes | Chemical changes |
| 1. | ||
| 2. |
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