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Displaying 5 out
of 47
questions & answers.
Q1.
Identify the following as reversible or irreversible changes.
- Melting of wax
- Dissolving of salt in water
- Growth of a baby
- Cooking of food
- Growth of a plant
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Answer:
S A M P L E
- Irreversible
- Reversible
- Irreversible
- Irreversible
- Irreversible
Q2.
What is an undesirable change? Give examples.
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Answer:
S A M P L E
answer not shownQ3.
Why melting of ice is considered a reversible change?
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Answer:
S A M P L E
Melting of ice is a physical change in which there is change in its physical state only. It is a reversible change as liquid water can freeze to become ice again.
Q4.
What is an endothermic change? Give examples.
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Answer:
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A change in which heat is absorbed is called an endothermic change.
Examples: Cooking of food, boiling of water, etc.
Q5.
Write/Choose the correct answer.
- A physical change is temporary and ______.
- Chemical changes involve breaking if old chemical bonds which exist between the atom of reaching substances and then making new chemical bonds between the rearranged atoms to form new substances. (True/false)
- Germination of a seed is a ______ change. (chemical/physical)
- There is a change in the net ______ of the system during a chemical change.
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Answer:
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- reversible
- True
- chemical
- energy
