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प्रश्न
Give one example of change which occurs on heating but cannot be reversed.
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उत्तर
Baking chapati is an irreversible change.
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संबंधित प्रश्न
Circle the odd one.
When a candle is lit the following changes are observed.
- Wax melts.
- Candle keeps burning.
- The size of the candle decreases.
- The molten wax solidifies
- Which of the changes can be reversed? Justify your answer
Changes which cannot be reversed are called ______.
The burning of the paper is an irreversible change.
While lighting a candle, Paheli observed the following changes.
- Wax was melting
- Candle was burning
- Size of the candle was reducing
- Melted wax was getting solidified.
Of the above, the changes that can be reversed are
Can we reverse the following change? If yes, suggest the name of the method.
Water vapour into water
Can we reverse the following change? If yes, suggest the name of the method.
Ice into water
Tearing of paper is said to be a change that cannot be reversed. What about paper recycling?
Give one example of change which occurs on cooling but can be reversed.
Paheli mixed flour and water and
- made a dough,
- rolled the dough to make a chapati,
- baked the chapati on a pan,
- dried the chapati and ground it in a grinder to make powder.
Identify the changes (i) to (iv) as the changes that can be reversed or that cannot be reversed.
