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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).
Some examples:
Analysis or decomposition
It is the reaction in which only one reagent (AB) produces two or more products (A and B).
Some examples:
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.
or 
Some examples:
Double exchange or permutation
In this type of reaction there is an exchange between two compound substances that combine, forming two other compound substances.
Some examples:
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.
