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Fill in the blanks 

(a) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called ————. 

(b) A group of atoms carrying a fixed charge on them is called ————. 

(c) The formula unit mass of Ca3 (PO4)2 is ————. 

(d) Formula of sodium carbonate is ———— and that of ammonium sulphate is ————.

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1 Answer

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(a) Law of conservation of mass 

(b) Polyatomic ion 

(c) (3 × atomic mass of Ca) + (2 × atomic mass of phosphorus) + (8 × atomic mass of oxygen) = 310 

(d) Na2 CO3 ; (NH4)2 SO4

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