13
QuizMultiple Choice

Shifts in Equilibrium — Unit test

Question 13 • IA-Chemistry A Survey of Chemistry A

According to Le Chatelier’s principle, what happens when the concentration of reactants is doubled in a chemical reaction that was in equilibrium?

Answer
A
The equilibrium shifts to the right to favor the formation of products.
B
The equilibrium shifts to the left to favor the formation of reactants.
C
The equilibrium is unaffected by the increase in concentration.
D
The equilibrium is lost because the concentrations have been disturbed.

Explanation

Doubling the reactant concentration disturbs the equilibrium by adding more reactants. By Le Chatelier’s principle, the reaction shifts in the direction that uses up some of the added reactants, so it shifts to the right and forms more products. The system can then establish a new equilibrium.

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