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प्रश्न
Differentiate reversible and irreversible changes.
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उत्तर
| Reversible Change | Irreversible Change |
| A substance can turn to its original state. | A substance cannot change to its original state. |
| The chemical properties of the substance do not change. | The chemical properties of the substance will change. |
| Most of the physical changes are reversible. | All chemical changes are irreversible. |
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संबंधित प्रश्न
Very Short Answer Type Question:
Give two examples of irreversible changes.
To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Water on ______ changes to ice and on ______ comes back to water.
The burning of the paper is an irreversible change.
Rusting of iron is a reversible change.
What are irreversible changes?
Paheli had bought a new bottle of pickle from the market. She tried to open the metal cap to taste it but could not do so. She then took a bowl of hot water and immersed the upper end of the bottle in it for five minutes. She could easily open the bottle now. Can you give the reason for this?
Boojho’s sister broke a white dove, a symbol of peace, made of Plaster of Paris (POP). Boojho tried to reconstruct the toy by making a powder of the broken pieces and then making a paste by mixing water. Will he be successful in his effort? Justify your answer.
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.
Circle the odd one out. Give a reason for your choice.
