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.
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(a) Conversion of solid to vapour is called sublimation. Name the term used to denote the conversion of vapour to solid.
(a) Sublimation (b) The amount of heat required to convert 1 kg of solid into liquid at one atmosphere pressure at its melting point is known as its latent heat of...
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To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Yes, by unfolding the dress this change can be reversed
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You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can this change be reversed?
No, it cannot be reversed, so it is an irreversible change.
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Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.
S. NO Change Can be reversed (Yes / NO) 1. The Sawing of a Piece of food No 2. The melting of ice candy yes 3. Dissolving sugar in water yes 4. The cooking of food No 5. The Ripening of mango No 6. Souring of milk No
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Pick the change that can be reversed from the following (a) Cutting of trees
(b) Melting of ghee
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Which of the following change cannot be reversed? (a) Hardening of cement
(a) Hardening of cement
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Tearing of paper is said to be a change that cannot be reversed. What about paper recycling?
We do get the paper on paper recycling but it is not the same original paper that we get. The colour and texture of the paper changes.
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Give one example in each case (a) Change which occurs on heating but can be reversed.
(a) Heating of an iron rod. (b) Baking of chapati. (c) Formation of ice from water. (d) Formation of salt solution. (e) Mixing of cement and water.
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Change of a bud into a flower is a change which cannot be reversed. Give four more such example.
(i) Milk into curd (ii) Burning of wood (iii) Ripening of fruits (iv) Digestion of food
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Which of the following is an exothermic reaction? (A) Conversion of limestone to quick lime. (B) Conversion of silver bromide to silver
(C) Formation of compost from vegetable matter. Reactions given in option (A), (B) and (D) are examples of endothermic reactions and require energy in form of heat, light and electricity respectively....
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