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Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 5

Differentiate reversible and irreversible changes. - Science

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Question

Differentiate reversible and irreversible changes.

Distinguish Between
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Solution

Reversible Change Irreversible Change
A substance can turn to its original state. A substance cannot change to its original state.
The chemical properties of the substance do not change. The chemical properties of the substance will change.
Most of the physical changes are reversible. All chemical changes are irreversible.
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Chapter 4: Science in Everyday Life - Evaluation [Page 138]

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Samacheer Kalvi Science - Term 1 [English] Class 5 TN Board
Chapter 4 Science in Everyday Life
Evaluation | Q V. 3. | Page 138

RELATED QUESTIONS

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  

Changes which cannot be reversed are called ______.


Rolling of chapati and baking of chapati are the changes that ______.


Can we reverse the following change? If yes, suggest the name of the method.

Water into water vapour


Can we reverse the following change? If yes, suggest the name of the method.

Water vapour into water


Give one example of change which occurs on cooling but can be reversed.


lt was Paheli’s birthday, her brother Simba was helping her to decorate the house for the birthday party and their parents were also busy making other arrangements. Following were the activities going on at Paheli’s home:

  1. Simba blew balloons and put them on the wall.
  2. Some of the balloons got burst.
  3. Paheli cut colourful strips of paper and put them on the wall with the help of tape.
  4. She also made some flowers by origami (paper folding) to decorate the house.
  5. Her father made dough balls.
    Mother rolled the dough balls to make puries.
  6. Mother heated oil in a pan.
  7. Father fried the puries in hot oil.

Identify the activities at Paheli’s home as those that can be reversed and those which cannot be reversed.


Find the odd one out. Give reason for your choice.


Choose the odd one out. Give reason for your choice.


Find the odd one out. Give reason for your choice.


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