Respuesta :
the method that will usually cause a reaction to speed up from the list given is: Reducing the concentration of reactants.
Meaning of Reaction
Reaction can be defined as the combination of substances or a process where substances acts on each other, where substances changes into different substances.
A reaction can be said to be the event that causes a restructuring or rearrangement of atoms of a substance when it is in contact with another substance.
In conclusion, the method that will usually cause a reaction to speed up from the list given is Reducing the concentration of reactants.
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