As the temperature increases, what happens to the solubility of a solid? of a gas?

As temperature increases, so does solubility. Think of when you are making hot chocolate vs when you make chocolate milk. The powder mixed into the hot chocolate dissolves easily within the milk because of the high temperature (meaning high solubility). Powder in the cold chocolate milk does not dissolve as easily because of the low temperature meaning low solubility.

For gases, it is almost the opposite. As temperature increases the solubility of gas decreases.

  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-