1. A chemical reaction is at equilibrium. What will be the effect if more of the product is added?n a There will be no effect; the reaction will stay at equilibrium.nn b The reaction will shift to the right (toward the products).nn c The reaction will shift to the left (toward the reactants).nnnn2. Which of the following is likely to occur if more reactants are added to a reaction that is at chemical equilibrium?n a There will be no effect; the reaction will stay at equilibrium.nn b The reaction will shift to the left (toward the reactants).nn c The reaction will shift to the right (toward the products).nnnn3. Which of the following describes the effects of changes in concentration on a chemical system in equilibrium?n a Le Châtelier’s principlenn b Gibbs free energynn c Heisenberg uncertainty principlenn d reaction ratennnn4. Changes in which of the following do not shift the equilibrium of a chemical system?n a temperaturenn b timenn c concentrationnn d pressurennnn5. Consider the reaction 2NaN3 2Na + 3N2, which is the first reaction that occurs when an air bag expands in a car undergoing a collision. This reaction happens very quickly, as you might suspect. A graph showing the amount of nitrogen gas (N2) could be best described as which of the following?n a The graph line’s general trend is absolutely horizontal.nn b The graph line’s general trend is increasing from left to right.nn c The graph line’s general trend is decreasing from left to right.nn d The graph line’s general trend is nearly horizontal.
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