There are two kinds of changes: reversible changes and irreversible changes.
Reversible Change – When a change can be undone, it is referred to as reversible change. Examples include ice melting, paper folding, water turning into vapour, balloon inflation, etc.
Irreversible Change – Irreversible change occurs when a change cannot be reversed. Cooking, growth in a living being, paper burning, and so on are examples.
Download PDF of Class 6 Chemistry Chapter 6 Changes Around Us – Set 2
CBSE Class 6 Chemistry Worksheet Chapter 6 Changes Around Us – Set 2
Q1. Stretching of a rubber band is a –
a.) reversible change
b.) Irreversible change
c.) Both reversible and irreversible
d.) None of the above
Q2. The germination of a seed is-
a.) Fast, irreversible change
b.) Slow, irreversible change
c.) Slow, reversible change
d.) Fast, reversible change
Q3. Which of the following is not a reversible change?
a.) Formation of curd
b.) Melting of ice
c.) Heating of water
d.) Boiling of an egg
Q4. Fill in the blanks.
a.) On cooling, metals ____.
b.) Burning an incense stick is a ____ change.
c.) Ripening of fruit is a/an ____ change.
Q5. State True or False.
a.) The formation of curd from milk is an irreversible change.
b.) All irreversible changes are undesirable.
c.) Condensation is the opposite of evaporation.
Q6. Define melting.
Q7. Indicate whether the change in coal tar caused by heating is reversible or irreversible.
Q8. What do you mean by irreversible changes? Give examples.
Q9. What is the cause of the melting of ice?
Q10. What are expansion and contraction?
Q11. Explain why the burning of wax is an irreversible change.
Q12. How is the iron blade (hoe, spade, axe) attached to the wooden handle?
Q13. What are the characteristics of physical change?
Q14. How can the dissolution of salts be reversed?
Q15. What is the difference between the following changes:
(a) Making rotis from dough.
(b) Baking of a roti.
Download PDF to access answers of Chemistry Worksheet for Class 6 Chemistry Chapter 6 Changes Around Us Set – 2
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Read Also:
- Reversible And Irreversible Changes
- Chemical Change
- Chemical and Physical Change
- Difference Between Physical and Chemical Change
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