20 chemistry words from chapter 1 of class 9
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Dalton used symbol [O] for oxygen,[H] for hydrogen.
Symbol represents gram atom(s) of an element.
Symbolic expression for a molecule is called molecular formula.
Sodium chloride has two radicals. Sodium is a basic radical, while chloride is an acid radical.
Valency of carbon in CH4 is 4, in C2H64, in C2H44 and in C2H2 is 4.
Valency of iron in FeCl2 is 2 and in FeCl3 it is 3.
Formula of iron (III) carbonate is Fe2[CO3]3.
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