What must happen before a chemical reaction can begin?

a the activation energy must be exceeded.
b the activation energy must be reached.
c the concentrations of products and reactants must be equal.
d the concentration of reactant molecules must be reduced.

Predict the reactants of this chemical reaction. that is, fill in the left side of the chemical equation. be sure the equation you submit is balanced. (you can edit both sides of the equation to balance it, if you need to.) note: you are writing the molecular, and not the net ionic equation. > cacl2(aq) + h20(l)