The changes around us may involve changes in shape, size, position, colour, temperature, structure, composition, and state. These changes affect substances. Stretching a rubber band, burning a candle, cooking food, settling curd, and dissolving sugar in water are a few of the changes. These changes are broadly classified into two types- physical changes and chemical changes.
A change in which the physical property of substance changes and no new substance is formed is known as a physical change. Example: Melting of ice, cutting of trees, tearing of paper, etc. In contrast, a change in which two substances interact to produce one or more new substances with different properties is known as a chemical change. Example: Rusting of iron, formation of manure from leaves, formation of curd from milk.
Download Class 7 Chemistry Worksheet on Chapter 6 Physical and Chemical Changes Set 1 PDF
CBSE Class 7 Chemistry Chapter 6 Physical and Chemical Changes Worksheet – Set 1
Q1. Rusting of iron is a _______.
(a) Physical change
(b) Chemical change
(c) Both (a) and (b)
(d) Neither (a) nor (b)
Q2. What happens when sulphur is heated with iron fillings?
(a) Fast change
(b) Physical change
(c) Periodic change
(d) None of the above
Q3. What is the chemical formula of rust?
(a) Iron sulphide
(b) Iron oxide
(c) Iron hydroxide
(d) None of the above
Q4. Souring of milk is an example of _______.
(a) Physical change
(b) Chemical change
(c) Natural change
(d) None of the above
Q5. Growth of plants is ________.
(a) Physical change
(b) Chemical change
(c) Natural change
(d) None of the above
Q6. The reddish-brown layer deposited on the surface of iron objects is called ________.
Q7. A _______ change is also known as a chemical reaction.
Q8. The chemical formula of magnesium oxide is _______.
Q9. State true or false.
Cutting a log of wood is a chemical change.
Q10. State true or false.
The formation of manure from leaves is a physical change.
Q11. What are the constituents of stainless steel?
Q12. What is a chemical change?
Q13. What is rusting?
Q14. What is galvanisation?
Q15. What is crystallisation?
Q16. Distinguish between a physical and chemical change.
Q17. State any three ways of preventing rusting of iron.
Q18. What is a physical change? State any four characteristics of physical change with examples.
Q19. What happens if the gas produced by the reaction between vinegar and baking soda is passed through limewater? Justify your answer.
Q20. Why do you observe a change in colour of the solutions of copper sulphate when an iron nail is dropped in it? Why does the shining iron nail become dull?
Download the PDF to access answers to the Chemistry Worksheet for Class 7 Chemistry Chapter 6 Physical and Chemical Changes Set -1
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Read Also:
- Chemical and Physical Change
- Difference Between Physical and Chemical Change
- Chemical and Physical Change Examples
- Physical Change
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