Q.1. True/False
(i) Rusting of iron is a physical change.
(ii) Evaporation of water is a reversible change.
(iii) All physical changes are reversible.
(iv) Burning of magnesium ribbon produces a white powder.
(v) Bioluminescence produces light without heat.
Q.2. Fill in the blanks.
(i) Cutting a log of wood into pieces is a ____ change.
(ii) Condensation is a ____ change.
(iii) When carbon dioxide is passed through lime water, it turns milky due to the formation of ____.
(iv) Two methods by which rusting of iron can be prevented are ____ and ____.
(v) Changes in which only ____ properties of a substance change are called physical changes.
(vi) A medicine is the end product of a chain of ____.
Answer the following Questions
Q3. What is the white substance formed when lime water reacts with carbon dioxide?
Q4. What kind of change is chopping vegetables?
Q5. Name the three requirements of the fire triangle.
Q6. Which process breaks down rocks into soil over time?
Q7. What kind of change is melting wax?
Q8. What happens when magnesium ribbon is burnt in air?
Q.9. What do you understand by chemical change?
Q.10. Why formation of manure from leaves is a chemical change?
Q.11. Why tearing of paper into pieces is a physical change?
Q.12. What is rusting?
Q.13. Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.
Q.14. What is a physical change?
Q.15. Explain the changes that occur when a candle burns.
You can find Worksheets Solutions here: Worksheet Solutions: Physical and Chemical Changes