ILLLICI
Whic
bstance is the precipitate in the following
Ulali 3 CM
ction?
Pb(NO3)2(aq) + Na2SO4(aq) ® PbSO4(s) + 2NaNO3(aq)
O PbSO4
M
eses
O Pb(NO3)2
O Na2SO4
O Pb(NO3)2

PbSO₄(s)

Explanation:

The (s) after the formula tells you that PbSO₄ is the solid.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-