16. in what kind of reaction does a single chemical compound break apart to form smaller products?
a decomposition reaction
single repalcement
b. synthesis reaction
precipitate reacton

A) Decomposition reactions:

Explanation:

When single chemical compound break apart to form smaller products reaction is called decomposition reaction.

Decomposition reaction:

It is the reaction in which one reactant is break down into two or more product.

AB → A + B

Synthesis reaction:

It is the reaction in which two or more simple substance react to give one or more complex product.

Na + Cl →  NaCl

Single replacement:

It is the reaction in which one elements replace the other element in compound.

AB + C → AC + B

Precipitation reaction:

When two solution containing salts are combined produced the precipitate of insoluble salt

  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-

i think   the answer is c hope i'm right