Chemical reactions can be classified in several ways. The most common is the one that uses as a parameter the types of reactant and resulting substances.
Synthesis or Addition
In this reaction, two or more reagents (A and B) combine to form only one product (AB).
Analysis or decomposition
It is the reaction in which only one reagent (AB) produces two or more products (A and B).
Simple change or shift
It is the reaction in which a simple substance combines with a compound substance, forming another simple substance and a compound one.
Double exchange or permutation
In this type of reaction there is an exchange between two compound substances that combine, forming two other compound substances.
Condition for a chemical reaction to occur
For two or more substances to react chemically, the following conditions are required:
- your molecules should be arranged so as to make the most contact possible. Generally gaseous substances react faster and easier than solid-state substances;
- reagents must have chemical affinity, that is, a certain "tendency to react" to each other.