Physical & Chemical Changes

Physical and Chemical Changes Worksheet-1

1. The compound formed on burning magnesium ribbon is:

(a) Magnesium hydroxide          (b) Magnesium oxide

(c) Any of these                             (d) Magnesium carbonate

2. The compound formed on dissolving magnesium oxide in water is:

(a) Magnesium hydroxide          (b) Magnesium oxide

(c) Magnesium carbonate          (d) Any of these

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

Physical and Chemical Changes Worksheet-3

1. Which of the following is an incorrect statement?

(a) Burning of coal is a chemical change

(b) Rusting of iron is due to formation of hydrated ferric oxide

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

(d) Respiration is a chemical process

2. When an iron nail is dipped in copper sulphate (blue vitrol) solution, it turns green due to the formation of:

(a) Iron sulphate

(b) Mixture of copper & iron

(c) Deposition of copper on iron nail

(d) None of these