Change of a bud into a flower is a change which cannot be reversed. Give four more such example.

Academic Chemistry NCERT Class 6

Given below are some examples of irreversible changes

Digestion of food
Milk to curd
Burning of wood
Ripening of fruits

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Updated on: 01-Feb-2023

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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.
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.
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
Tearing of paper is said to be a change that cannot be reversed. What about paper recycling?
Which of the following change cannot be reversed?Hardening of cementFreezing of ice creamOpening a doorMelting of chocolate
Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings.
Give one example of a physical change in which energy is given out, and one example of physical change in which energy is absorbed?
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.
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.
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
Pick the change that can be reversed from the following.Cutting of treesMelting of gheeBurning of candleBlooming of flower
Is converting wood into sawdust a reversible change? Give a reason for your answer.
(a) What is a physical change? Give two examples of physical changes.(b) What is a chemical change? Give two examples of chemical changes.
Give One Example of an Evolutionary Change Produced in an Organism for One Purpose Which Later On Becomes More Useful for A Different Function.
What is a physical change? Explain with example.

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