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Question

(a) What are polyatomic ions? Give two examples.

(b) Name the fundamental law that is involved in every equation.
 


Solution

(a)  A polyatomic ion is a group of atoms carrying the positive or negative charge.

e.g.

Polyatomic ions                                                    Symbol

Ammonium                                                             (NH4)+

Hydroxide                                                               OH 

Nitrate                                                                     NO3

Hydrogen carbonate                                               HCO3 

Sulphate                                                                 (SO4)2

Sulphite                                                                  (SO3)2

Phosphate                                                               (PO4)3

Carbonate                                                                (CO3)2 

(b) The law of conservation of mass is involved in every equation. The amount of reactant must be equal to the amount of product, there is no demolishing of quantities 

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