Question 6 (5 points) All of these reactions that show a change are known as "double-displacement"
reactions. Write a summary about how aqueous (liquid) ionic compounds react, using
the term double-displacement reaction, and discussing how many reactions showed
a change and how many did not. Be sure to explain how you know a chemical
reaction has occurred.

not clear

  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-