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Conversion of ice into water and water into ice is an example of change which can be reversed. Give four more examples where you can say that the changes can be reversed.
Given below are some examples of changes that can be reversed:
- Folding of a paper
- Knitting of a sweater
- Inflating a balloon
- Melting of wax
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- Change of a bud into a flower is a change which cannot be reversed. Give four more such example.
- Rolling of chapati and baking of chapati are the changes that(a) can be reversed(b) cannot be reversed(c) can be reversed and cannot be reversed, respectively(d) cannot be reversed and can be reversed, respectively
- Give examples to explain the difference between changes that can or cannot be reversed.
- Salt can be separated from its solution (salt dissolved in water), because(a) mixing of salt in water is a change that can be reversed by heating and melting of salt(b) mixing of salt in water is a change that cannot be reversed(c) mixing of salt in water is a permanent ‘ change(d) mixing of salt in water is a change that can be reversed by evaporation.
- Give one example in each case:(a) Change which occurs on heating but can be reversed.(b) Change which occurs on heating but cannot be reversed.(c) Change which occurs on cooling but can be reversed.(d) Change which occurs on mixing two substances, but can be reversed.(e) Change which occurs on mixing two substances, but cannot be reversed.
- Can we reverse the following changes? If yes, suggest the name of the method.(a) Water into water vapour(b) Water vapour into water(c) Ice into water(d) Curd into milk
- Which of the following change cannot be reversed?Hardening of cementFreezing of ice creamOpening a doorMelting of chocolate
- Some common changes are given in Table 6.1. Which of these changes do you think can be reversed"\n
- What are changes that occur in an incense stick, when it is burnt? Can these changes be reversed?
- Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates aphysical change that can be reversedchemical change that can be reversedphysical change that cannot be reversedchemical change that cannot be reversed.
- Pick the change that can be reversed from the following.Cutting of treesMelting of gheeBurning of candleBlooming of flower
- How can a hydrated salt be converted into anhydrous salt? Give an example.
- You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can this change be reversed?
- Give example of material that can be used again.
- Give two examples to show that changes can be observed by their effects.

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