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CISCEICSE ICSE Class 7
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Classification of Change: Reversible and Irreversible Changes

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Maharashtra State Board: Class 7

Classification of Changes: Reversible and Irreversible Changes:

  1. Reversible Changes: Changes that can be reversed, meaning the material can return to its original state, are called reversible changes. For example, melting of wax, folding paper, ice melting into water, etc.
  2. Irreversible Changes: Changes that cannot be reversed, meaning the original material cannot be obtained back, are called irreversible changes. For example, ripening of fruit, burning of wood, cooking food, etc.

Related QuestionsVIEW ALL [88]

Paheli mixed flour and water and

  1. made a dough,
  2. rolled the dough to make a chapati,
  3. baked the chapati on a pan,
  4. 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.

Short Answer Type Question:
What is a physical change? Explain with example.

Drying of wet clothes in air is an example of

Differentiate reversible and irreversible changes.

Very Short Answer Type Question:
Some common changes are given in the below Table. Which of these changes do you think can be reversed?

Change Can be reversed
(i) Raw egg to boiled egg Yes/No
(ii) Batter to idli  
(iii) Wet clothes to dirty clothes  
(iv) Woollen yarn to knitted sweater  
(v) Grain to its flour  
(vi) Cold milk to hot milk  
(vii) straight string to a cold string  
(viii) Bud to flower  
(ix) Milk to paneer  
(x) Cow dung to biogas  
(xi) stretched rubber band to its normal size  
(xii) Melting of ice-cream  

Most of the physical changes are ______. 

What is reversible change?

Tearing of paper is said to be a change that cannot be reversed. What about paper recycling?

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