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Topic 9 – Kinetics and Equilibrium
17. Chemical equilibrium – Le Chatelier’s Principle: Recalling concept facts
1. As the concentration of one or more reactants is increased in a reaction at equilibrium, the
concentration of the products will
1) Increase 2) Decrease 3) remains the same
2. As the concentration of the products is decreased in a reversible reaction that has reached
equilibrium, the concentration of the reactants will
1) Increase 2) Decrease 3) Remains the same
3. Increasing temperature on equilibrium reactions favors
1) Exothermic reaction, only
3) Both exothermic and endothermic reaction
2) Endothermic reaction, only 4) Neither exothermic nor endothermic reaction
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4. Decreasing temperature on a reversible reaction at equilibrium favors
1) Exothermic reaction and decrease its rate
2) Exothermic reaction and increase its rate
3) Endothermic reaction and decrease its rate
4) Endothermic reaction and increase its rate
5. When more heat is added to equilibrium reaction, the reaction will
1) Shift in the direction of exothermic reaction, and increase its rate
2) Shift in the direction of exothermic reaction, and decrease its rate
3) Shift in the direction of endothermic reaction, and increase its rate
4) Shift in the direction of endothermic reaction, and decrease its rate
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6. Increasing pressure on equilibrium reaction will cause the reaction to speed up in the direction
that will produce
1) Less of the substances on the side with greater number of moles
2) More of the substances on the side with greater number of moles
3) More of the substances on the side with lesser number of moles
4) More of the reactants and the products equally
7. The addition of a catalyst to a system at equilibrium will increase the rate of
1) Forward reaction only
2) Reverse reaction only
3) Both the forward and reverse reactions
4) Neither the forward nor the reverse reaction
8. Which change will have the least effect on concentration of substances in equilibrium reaction?
1) Adding a catalyst to the reaction
2) Increasing temperature of the reaction
3) Increasing pressure on the reaction
4) Increasing concentration of the reactants
9. A reaction is at equilibrium. The rate of the forward reaction will increase with the addition of
heat if the forward reaction
1) Is exothermic
2) Is endothermic
3) Both exothermic and endothermic
4) Neither exothermic nor endothermic
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 283
Topic 9 – Kinetics and Equilibrium
17. Chemical equilibrium – Le Chatelier’s Principle: Recalling concept facts
1. As the concentration of one or more reactants is increased in a reaction at equilibrium, the
concentration of the products will
1) Increase 2) Decrease 3) remains the same
2. As the concentration of the products is decreased in a reversible reaction that has reached
equilibrium, the concentration of the reactants will
1) Increase 2) Decrease 3) Remains the same
3. Increasing temperature on equilibrium reactions favors
1) Exothermic reaction, only
3) Both exothermic and endothermic reaction
2) Endothermic reaction, only 4) Neither exothermic nor endothermic reaction
Teacher Preview Copy
4. Decreasing temperature on a reversible reaction at equilibrium favors
1) Exothermic reaction and decrease its rate
2) Exothermic reaction and increase its rate
3) Endothermic reaction and decrease its rate
4) Endothermic reaction and increase its rate
5. When more heat is added to equilibrium reaction, the reaction will
1) Shift in the direction of exothermic reaction, and increase its rate
2) Shift in the direction of exothermic reaction, and decrease its rate
3) Shift in the direction of endothermic reaction, and increase its rate
4) Shift in the direction of endothermic reaction, and decrease its rate
Teacher Preview Copy
6. Increasing pressure on equilibrium reaction will cause the reaction to speed up in the direction
that will produce
1) Less of the substances on the side with greater number of moles
2) More of the substances on the side with greater number of moles
3) More of the substances on the side with lesser number of moles
4) More of the reactants and the products equally
7. The addition of a catalyst to a system at equilibrium will increase the rate of
1) Forward reaction only
2) Reverse reaction only
3) Both the forward and reverse reactions
4) Neither the forward nor the reverse reaction
8. Which change will have the least effect on concentration of substances in equilibrium reaction?
1) Adding a catalyst to the reaction
2) Increasing temperature of the reaction
3) Increasing pressure on the reaction
4) Increasing concentration of the reactants
9. A reaction is at equilibrium. The rate of the forward reaction will increase with the addition of
heat if the forward reaction
1) Is exothermic
2) Is endothermic
3) Both exothermic and endothermic
4) Neither exothermic nor endothermic
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 283
