Compare and contrast single-bonded compounds and double-bonded compounds.

The main difference between single double and triple bond is the number of shared electrons. If the shared number is one pair of electrons, the bond will be a single bond, whereas if two atoms bonded by two pairs (four electrons), it will form a double bond.

Souce: pediaa.com/difference-between-single-double-and-triple-bonds/

  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-