9th Class
Science
Matter in Our Surroundings
Question Bank
9th CBSE Science Matter in Our Surroundings
question_answer
The
fragrance produced due to burning of incense stick is due to movement of
gaseous vapours produced rapidly in all directions.
To demonstrate motion of particles of solid matter
(a) Drop a crystal of copper sulphate or potassium
permanganate into a glass of hot water.
(b) Do not stir the solution and allow the crystals to
settle at the bottom,
(c) The colour of the solid is seen spreading slowly.
(d) This is because the solid particles diffuse in the
water. (5)