Chemistry
Define the following terms:
(a) Matter
(b) Intermolecular force of attraction
(c) Diffusion
(d) Brownian motion
(e) Kinetic energy
Matter
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Answer
(a) Matter — Matter is anything that has mass, occupies space and can be perceived by our senses.
(b) Intermolecular force of attraction — A force of attraction that exists between the particles of matter which holds them together is known as intermolecular force of attraction.
(c) Diffusion — The intermixing of two or more substances due to the motion of their particles in order to get a uniform mixture is called diffusion.
(d) Brownian motion — The zig-zag, random motion of suspended particles on the surface of a liquid or in air is called Brownian motion.
(e) Kinetic energy — The energy possessed by a body due to its motion is called kinetic energy.
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Related Questions
Name the following:
(a) The substances which can flow.
(b) The intermixing of two or more substances due to their motion.
(c) The force of attraction between the particles of a substance.
(d) The substances which have a definite shape and volume.
(e) The state of matter which is highly compressible.
(f) The temperature at which a solid starts changing into a liquid.
(g) The change of vapour of a substance directly into a solid on cooling.
Give two examples for each of the following:
(a) The substances which can sublime.
(b) The substances which do not change their state on heating.
(c) The substances which can flow.
Give reasons:
A gas can fill the whole vessel in which it is enclosed.
Give reasons:
Solids cannot be compressed.