Students are preforming a lab experiment in chemistry class where they must find out what 3 mystery solutions are. The bottles are not labeled,
but one of the bottles contains NaCl, another bottle contains AgNO3, and
another bottle contains K2SO4. The students decide to mix one drop of
each unknown chemical with one drop of some known chemicals to see if
precipitates form in order to identify the unknown chemicals. Use the data
table below to determine each unknown.

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  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-