is??.
(d) Formula of sodium carbonate is ......... and that of
ammonium sulphate is ......... .
Answer:
(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 group of atoms carrying a fixed charge on them is
called polyatomic ion.
(c) The formula unit mass of
is 310 g.
(d) Formula of sodium carbonate is 
and that of
ammonium sulphate is 
.
Complete the following crossword puzzle (Figure) by using
the name of the chemical elements. Use the data given in the table following.
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