Physical and Chemical Changes Worksheet-2

Physical and Chemical Changes Worksheet-2

1. Cutting and burning a piece of cloth is a:

(a) Physical change

(b) Chemical change

(c) Both of these

2. When a blade is dipped in copper sulphate (blue vitrol) solution, the colour of the solution turns green after sometime and brown substance gets deposited on the blade. The brown substance thus formed is:

(a) Iron sulphate                          (b) Iron

(c) Copper                                      (d) Any of these

3. A solid brown metal is added to a clear acidic solution. A white powder appears and the acid solution becomes cloudy. Which type(s) of change have/has occurred?

(a) Both chemical and physical

(b) Only physical

(c) Neither chemical nor physical

(d) Only chemical

4. Burning of candle is a:

(a) Physical change

(b) Chemical change

(c) Both of these

5. Mark the correct statement:

(a) Burning of coal does not produce a new substance

(b) Rust is hydrated Fe₂O₃

(c) The fizz that comes out when a soda bottle is opened is due to a chemical change

(d) Respiration is a physical process

6. Which change can be easily reversed?

(a) Chemical Change

(b) Physical Change

(c) Both a physical and chemical change

(d) Neither a physical nor chemical change

7. Which of the following reactions explains the above change most appropriate?

(a) ZnSO₄ + Cu → CuSO₄ + Zn

(b) CuSO₄ + Fe → FeSO₄ + Cu

(c) FeSO₄ + Cu → CuSO₄ + Fe

(d) CuSO₄ + Zn → ZnSO₄ + Cu

8. What is X?

(a) MgO             (b) MgO₂           (c) Mg₂O            (d) MgO₃

9. Which of the following is incorrect? OR Difference between physical and chemical changes

(a) Physical change : It is reversible

Chemical change : It is irreversible

(b) Physical change : No new substance is formed

Chemical change : One or more new substances are formed

(c) Physical change : Change may be accompained with evolution of energy

Chemical change : No energy is given off.

(d) Physical change : Arrangement of atoms remains the same.

Chemical change : The atoms of the substance are rearranged.

10. What causes the candle flame to get extinguished?

(a) Evolution of O₂ gas                (b) Evolution of CO₂ gas

(c) Formation of Ca(OH)₂          (d) Formation of CaCl₂

Answer Key:

1. (c)
2. (c)
3. (a)
4. (c)
5. (b)
6. (b)
7. (b)
8. (a)
9. (c)
10. (b)