1. Electricity is not considered matter. Why?
2. We can hold liquids in our hands. True or false? Explain.
3. Gases have no definite shape or volume. Explain.
4. We cannot move our fingers through a solid wall. Do you agree? Give reason.
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?
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Answers
Ans1. Electricity is just the flow of current from the charges from the flow of electrons due to positive and negative static charges. ... Electricity is not matter because electricity is the movement of matter.
Ans2. False. We can not hold liquid in our open hand because interparticle force of liquid is very low so it is a fluid.
Ans3.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 particles of solid are closely packed and occupy less space while particles of gases are loosely packed and occupy the complete space available.
Ans4.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.
Ans5.A gas fills its container, taking both the shape and the volume of the container. 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.
Ans6.When perfume is released it quickly changes into vapour. The kinetic energy of gas molecules is high & the rate of diffusion is high. Hence we can smell the perfume sitting several metres away.
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.
Answer:
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Explanation:
1. Electricity is just the flow of current from the charges from the flow of electrons due to positive and negative static charges. .Electricity is not matter because electricity is the movement of matter.
2. TRUE
We can not hold liquid in our open hand because interparticle force of liquid is very low so it is a fluid.
3. Like liquids, gases have no definite shape, but unlike solids and liquids, gases have no definite volume either. The change from solid to liquid usually does not significantly change the volume of a substance.
4. The force acting per unit area on the walls of the container is called pressure. Thus, gases exert pressure. 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.
5. A gas fills its container, taking both the shape and the volume of the container. 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.
6. the smell of perfume gets spread in room because the perfume particles get diffused with air and after some time we can smell it.
7. All three states of matter (solid, liquid and gas) expand when heated. 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.