Define a pure substance.
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A substance which has a definite composition and consistent properties throughout is called a pure substance.
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Give the symbols of: carbon, calcium, copper, chlorine, cobalt, argon, silicon, aluminium.
Give the names of the elements represented by the following symbols:
(a) B
(b) He
(c) Si
(d) Be
(e) Li
(f) P
(g) K
(h) F
Name the types of pure substances you know.
Define:
(a) Elements
(b) Compounds.