We encounter a lot of changes in everyday life. Cooking food, burning candles, settling curd, and stretching rubber bands are some changes observed in everyday life. It may change shape, size, position, structure, colour, temperature, composition or state of the substance. The change escorted by a change in a substance’s physical properties is referred to as a physical change. No new substance is formed in a physical change. In contrast, a change accompanied by a change in a substance’s chemical properties is referred to as a chemical change.
Download Class 7 Chemistry Worksheet on Chapter 6 Physical and Chemical Changes – Set 2 PDF
CBSE Class 7 Chemistry Chapter 6 Physical and Chemical Changes Worksheet – Set 2
Q1. Pure and bigger crystals can be obtained by the process of __________.
(a) Condensation
(b) Distillation
(c) Crystallisation
(d) None of the above
Q2. Which of the following processes is used to obtain salt from the seawater?
(a) Crystallisation
(b) Evaporation
(c) Decantation
(d) None of the above
Q3. The kitchen gas we use is LPG. In the cylinder, it exists as a fluid. When it comes out of the cylinder, it evolves as a gas (change A) and then burns (change B). The subsequent statements pertain to these changes. Choose the correct statement.
(a) A is a chemical change
(b) B is a chemical change
(c) A and B are chemical changes
(d) A and B are physical changes
Q4. Choose the correct statement.
(a) Chemical changes are always reversible
(b) Chemical changes are always irreversible
(c) Chemical changes are mostly reversible
(d) Chemical changes are mostly irreversible
Q5. Which of the following changes does not produce a new substance?
(a) Burning of fuel
(b) Formation of curd from milk
(c) Drying of clothes
(d) None of the above
Q6. The change in which only the _______ property of a substance changes is known as a physical change.
Q7. When carbon dioxide is passed through lime water, it turns milky due to the formation of ________.
Q8. State true or false.
Iron and rust are the same substances.
Q9. State true or false.
The chemical formula of magnesium hydroxide is Mg(OH)2.
Q10. State true or false.
The burning of a candle is an example of chemical change.
Q11. What is a physical change?
Q12. Give some examples of chemical changes.
Q13. What is a chemical change?
Q14. Why is fermented food warmer than ordinary food?
Q15. State any two visible changes occurring during a chemical change.
Q16. How can we prevent iron from rusting?
Q17. What types of changes are taking place in the following?
(a) Magnetisation of an iron piece
(b) Dissolution of salt in water
(c) Expansion and contraction of metals
Q18. Is digestion of food a physical or chemical change?
Q19. Explain the characteristics of physical change with examples.
Q20. What happens when an iron nail is dipped in the copper sulphate solution?
Download the PDF to access answers to the Chemistry Worksheet for Class 7 Chemistry Chapter 6 Physical and Chemical Changes Set -2
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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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