# What are the rules to synthesis reactions?

May 13, 2015

A synthesis reaction (combination reaction) occurs when two or more reactants combine to produce a single product. The generic reaction is $\text{A+B}$$\rightarrow$$\text{C}$ .

The following are examples of synthesis reactions.

Hydrogen gas plus oxygen gas produce water.

"H"_2("g")+"O"_2("g")$\rightarrow$$\text{H"_2"O(g)}$

Sodium metal plus chlorine gas produce sodium chloride.

$\text{Na(s)"+"Cl"_2("g")}$$\rightarrow$$\text{NaCl(s)}$

Synthesis reactions can also occur between compounds.

Calcium oxide plus carbon dioxide produce calcium carbonate.

"CaO(s)"+"CO"_2("g")$\rightarrow$"CaCO"_3("s")