Question

Think and answer:-
1. Electricity is not considered matter. Why?
2. We cannot move our fingers through a solid wall. Do you agree? Give reason.
3. We can hold liquids in our hands. True or false? Explain.
4. Gases have no definite shape or volume. Explain.
5. Why are liquids and gases called fluids?
6. We can smell a perfume from several metres away. Explain.
7. Gases expand much more than solids or liquids on heating. Why?​

Answer 1

Answer:

Ans1.Electricity is not considered as matter because it has neither mass nor does it occupy space.

Ans2. The constant bombardment of the molecules on the walls of the container exerts a steady force. ... However we cannot move our hand in a solid block because there are strong forces of attractions between particles in a solid and there is no empty space between them.

Ans3. We can not hold liquid in our open hand because interparticle force of liquid is very low so it is a fluid. Hope it will help you.

Ans4. Gases do not have a definite shape or volume because the molecules in gases are very loosely packed, they have large intermolecular spaces and hence they move around. The force of attraction between molecules is also very less, as a result gases acquire any shape or any volume.

Ans5. Liquids and gases are called fluids because they can be made to flow, or move. In any fluid, the molecules themselves are in constant, random motion, colliding with each other and with the walls of any container. ... Under standard atmospheric conditions, water exists as a liquid.

Ans6. We can get the smell of perfume sitting several metres away due to diffusion. Vapours of perfume move rapidly in all directions and spread in the air by diffusion. When perfume vapours reach several metres away we can get the smell of perfume.

Ans7. Molecules within gases are further apart and weakly attracted to each other. Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.

Explanation:

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