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तामिळनाडू बोर्ड ऑफ सेकेंडरी एज्युकेशनएस.एस.एल.सी. (इंग्रजी माध्यम) इयत्ता ५

Differentiate reversible and irreversible changes. - Science

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प्रश्न

Differentiate reversible and irreversible changes.

फरक स्पष्ट करा
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उत्तर

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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पाठ 4: Science in Everyday Life - Evaluation [पृष्ठ १३८]

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सामाचीर कलवी Science - Term 1 [English] Class 5 TN Board
पाठ 4 Science in Everyday Life
Evaluation | Q V. 3. | पृष्ठ १३८

संबंधित प्रश्‍न

Long Answer Type Question:
How does curd being set? Is this change reversible?


Circle the odd one.


To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?


Look at the figure which shows three situations.

Which of these shows a reversible change and why?


Paheli had bought a new bottle of pickle from the market. She tried to open the metal cap to taste it but could not do so. She then took a bowl of hot water and immersed the upper end of the bottle in it for five minutes. She could easily open the bottle now. Can you give the reason for this?


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


Give one example of change which occurs on heating but cannot be reversed.


Give one example of change which occurs on mixing two substances, but cannot be reversed.


A potter working on his wheel shaped a lump of clay into a pot. He then baked the pot in an oven. Do these two acts lead to the same kind of changes or different? Give your opinion and justify your answer.


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.


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