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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.
(a) Change which occurs on heating but can be reversed- Heating of an iron rod.
(b) Change which occurs on heating but cannot be reversed- Baking of chapati.
(c) Change which occurs on cooling but can be reversed - Formation of ice from water.
(d) Change which occurs on mixing two substances, but can be reversed - Formation of salt solution.
(e) Change which occurs on mixing two substances, but cannot be reversed - Mixing of cement with water.
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- 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
- 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.
- Neutralization reaction is a(a) physical and reversible change(b) physical change that cannot be reversed(c) chemical and reversible change(d) chemical change that cannot be reversed
- Change of a bud into a flower is a change which cannot be reversed. Give four more such example.
- 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.
- 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.
- Which of the following change cannot be reversed?Hardening of cementFreezing of ice creamOpening a doorMelting of chocolate
- Tearing of paper is said to be a change that cannot be reversed. What about paper recycling?
- An iron ring is heated. Which of the following statement about it is incorrect?(a) The ring expands.(b) The ring almost comes to the same size on cooling.(c) The change in this case is reversed.(d) The ring changes its shape and the change cannot be reversed.
- Give examples to explain the difference between changes that can or cannot be reversed.
- You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can this change be reversed?
- Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.
- Pick the change that can be reversed from the following.Cutting of treesMelting of gheeBurning of candleBlooming of flower
- To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
- What are irreversible changes? Are they permanent changes and cannot be reversed?
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