When oxygen combines with another compound to form water and carbon dioxide. These reactions are exothermic, meaning they produce heat.
When two or more simple compounds combine to form a more complicated one.
A + B → AB
For example, iron and sulfur combine in a synthesis reaction to form iron (II) sulfide:
8Fe + S8 → 8FeS
The opposite of a synthesis reaction - a complex molecule breaks down to make simpler ones.
Single displacement (Substitution)
When one element trades places with another element in a compound
Double displacement (Metathesis)
When the anions and cations of two different molecules switch places, forming two entirely different compounds.
A special kind of double displacement reaction that takes place when an acid and base react with each other.