What must happen before a chemical reaction can begin?
The activation energy must be exceeded.
The activation energy must be reached.
The concentrations of products and reactants must be equal.
The concentration of reactant molecules must be reduced

A chemical reaction refers to a chemical process which involves the continuous transformation or rearrangement of the ionic, atomic or molecular structure of a chemical element by breaking down and forming chemical bonds, so as to produce a new chemical compound.

Note:

An ionic compound can be defined as crystalline solids (compounds) consisting of neatly packed and oppositely charged ions that are bonded through electrostatic forces.

A molecular structure can be defined as the three-dimensional arrangement (location) of ions or atoms with respect to one another in a molecule.

In conclusion, the activation energy of any chemical reaction must first of all be reached by the combining chemical elements (reactants) before it can begin or start.

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What must happen before a chemical reaction can begin? The activation energy must be exceeded. The activation energy must be reached. The concentrations of products and reactants must be equal. The concentration of reactant molecules must be reduced

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What must happen before a chemical reaction can begin?
The activation energy must be exceeded.
The activation energy must be reached.
The concentrations of products and reactants must be equal.
The concentration of reactant molecules must be reduced