Question

Fill in the blanks.
a) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called law of conservation of mass.
b) A groupof atoms carrying a fixed charge on them is called polyatomic ion.
The formula unit masss of `Ca_(3)(PO_(4))_(2)` is 310g.
d) Formula of sodium carbonate is .............. and that of ammonium sulphate is.............

Answer 1

(a)Law of conservation of mass
(b)Polyatomic ions
(c )`3xx"Atomic mass of Ca"+2xx"Atomic mass of P"+8xx"Atomic mass of O"`
`=3xx40+2xx31+8xx16=120+62+128=310u`
(d)`Na_(2)CO_(3), (NH_(4))_(2)SO_(4)`