1. To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Answer:
- Yes, we can reverse by simply unfolding the dress.
2. You accidentally dropped your favorite toy and broke it. This is a change you did not want. Can this change be reversed?
Answer:
- No, it can not be reversed.
3. Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.
Sr. no Change Can be reversed(Yes/No)
1. The sawing of a piece of wood
2. The Melting of ice candy
3. Dissolving sugar in water
4. The cooking of food
5. The ripening of a mango
6. Souring of milk
Answer:
Sr. no Change Can be reversed(Yes/No)
1. The sawing of a piece of wood No
2. The Melting of ice candy Yes
3. Dissolving sugar in water Yes
4. The cooking of food No
5. The ripening of a mango No
6. Souring of milk No
4. . A drawing sheet changes when you draw a picture on it. Can you reverse this change?
Answer:
- No, we can not erase the drawing with the eraser.
5. Give examples to explain the difference between changes that can or cannot be reversed.
Answer:
The following changes can be reversible:
- Drawing sketch on paper with a pencil
- Folding of paper
- Heating of water
The following changes can not be reversible:
- Broken toy
- Broken vessel
- Growth of human body
- Cutting trees
6. A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilized. Can the change in POP be reversed?
Answer:
- No, once POP hard, it can not be revert back to soft.
7. A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Answer:
No, when cement gets water or moisture it becomes hard and it can not be reverse its original position by simply drying it.
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