The statement that best explains what would happen if a reactant was added to a system in equilibrium is: The system would shift toward the products to oppose the change.
When a system that is in equilibrium, it means that the rates of the forward and reverse reactions are equal to each other.
If additional reactant is added to the system in equilibrium, the rate of forward reaction increases as the equilibrium shifts to the right towards the side of the products.
Therefore, the statement that best explains what would happen if a reactant was added to a system in equilibrium is: The system would shift toward the products to oppose the change.
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