A chemical reaction is said to take place when chemical changes take place. Chemical changes refer to a change in the chemical composition of the reacting species. In other words, chemical reactions produce (at least one) chemically different compound than those which participated in the reaction. A chemical can be written as:
A -> B
in this reaction A is the species which reacts and is called the reactant, while B is the species which is formed as a result of this reaction and is called the product. Thus, each chemical reaction has 2 sides: a reactant side and a product side. The reactant side is typically shown on the left, while the product side is typically written on the right side of the equation. There can be single or multiple reactants and/or products. We can also show the phase of the various reactants and products in a chemical reaction, such as solid, liquid, gas, and aqueous.
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