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Unformatted text preview: Week 2 Quiz 1. Consider the following reaction at equilibrium : CO 2 + H 2 O H 2 CO 3 . What would be the effect of adding additional H 2 CO 3 ? A. It would drive the equilibrium dynamics to the right. B. It would drive the equilibrium dynamics to the left. C. Nothing would happen, because the reactants and products are in equilibrium. D. The amounts of CO 2 and H 2 O would decrease. Answer : B Because the reaction is at equilibrium, increasing the concentration of reactants on either side of the arrow would drive the reaction in the other direction until it reached equilibrium again. 2. Which reaction is most spontaneous? A. a reaction that is slightly exothermic and leads to a slight increase in entropy B. a reaction that is slightly endothermic and leads to a huge decrease in entropy C. a reaction that is highly exothermic and leads to a huge decrease in entropy D. a reaction that is slightly exothermic and leads to a huge increase in entropy Answer : D Entropy plays a larger role than change in potential energy in determining how spontaneous a reaction is. 3. Which statement best summarizes the essence of chemical evolution? A. Energy in the form of sunlight or heat was transformed into chemical energy. B. Instead of being radiated back to space, energy in the form of sunlight or heat was retained in the oceans and atmosphere because of waters high specific heat. retained in the oceans and atmosphere because of waters high specific heat....
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This test prep was uploaded on 04/08/2008 for the course BIO 251 taught by Professor Pough during the Fall '06 term at RIT.
- Fall '06