Question

What are the rules to synthesis reactions?

Answer 1

A synthesis reaction (combination reaction) occurs when two or more reactants combine to produce a single product. The generic reaction is `"A+B"` `rarr` `"C"` .

The following are examples of synthesis reactions.

Hydrogen gas plus oxygen gas produce water.

`"H"_2("g")+"O"_2("g")` `rarr` `"H"_2"O(g)"`

Sodium metal plus chlorine gas produce sodium chloride.

`"Na(s)"+"Cl"_2("g")"` `rarr` `"NaCl(s)"`

Synthesis reactions can also occur between compounds.

Calcium oxide plus carbon dioxide produce calcium carbonate.

`"CaO(s)"+"CO"_2("g")` `rarr` `"CaCO"_3("s")`