Question

a) Explain with the help of an activity that the particles of a matter are very small.
b) Name the states of matter in which the forces between the constituent particles
are:
i) Strongest
ii) Weakest​

Answer 1

Answer:

(a) (i) Take 2-3 crystals of copper sulphate and dissolve in 100 ml of water.

(ii) Take out approximate 10 ml of this solution and put it into 90 ml of clear water.

(iii) Take out 10 ml of this solution and put it into another 90 ml of clear water.

(iv) Keep diluting for 5-8 times.

Inference : A crystal of copper sulphate contains millions of tiny particles which keeps on dividing into smaller and smaller numbers with each dilution.

(b) i) Strongest - Solid

ii)Weakest - Gas

Here is your answer. Hope it helps you.

Answer 2

Answer:

a) The matter is made up of very small particles. To know how small these particles are let us perform an activity.

Take 2-3 crystals of potassium permanganate and dissolve it in 10ml of water in a test tube. The colour of solution will be purple. Now transfer 1ml of this solution to another test tube and add 9ml of water to make volume again to 10ml. The darkness of purple colour will decrease. Repeat this activity 3-4 times. It is noted that the purple colour will not be disappeared altogether though it becomes lighter and lighter.

Thus, we conclude that there must be million of small particles present in one crystal of potassium permanganate which keep on dividing into smaller and smaller number therefore making colour lighter and lighter.

b) (i) The inter-particle force of attraction are strongest in solids, because particle are closely packed.

(ii) The inter-particle force of attraction are weakest in gases, because particle are freely packed.