Give reasons:
(a) Solids are rigid and retain their shape.
(b) Liquids and gases expand on heating.
(c) A solid does not flow but a fluid flows.
Answers
Answer:
a) solids:They are held tightly together by strong forces of attraction. They are held in fixed positions but they do vibrate. Because the particles don't move, solids have a definite shape and volume, and can't flow. LIQUIDS - This means that liquid particles are further apart and can move about more easily.
b) 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. However, gases that are contained in a fixed volume cannot expand - and so increases in temperature result in increases in pressure.
c) Because the particles don't move, solids have a definite shape and volume, and can't flow. Because the particles are already packed closely together, solids can't easily be compressed. Because there are lots of particles in a small volume, solids are dense.
Explanation:
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Answer:
a) It is because the intermolecular forces of attraction that are present in solids are very strong. The constituent particles of solids cannot move from their positions they can only vibrate from their mean positive.
b) Liquids and gases expand on heating because the molecules that make up the substance move more rapidly, which puts more distance between each of the molecules.
c) It is the property of fluids that it deforms and molecules move freely unlike solids where the bond are very strong.