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A reaction was found to be third order in A. Increasing the concentration of A by a factor of 3 will cause the reaction rate to __________. 19) A) decrease by a factor of the cube root of 3 B) increase by a factor of 27 C) increase by a factor of 9 D) remain constant E) triple
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Of the following equilibria, only __________ will shift to the left in response to a decrease in volume. 6) A) 2HI (g) H2 (g) + I2 (g) B) 4 Fe (s) + 3 O2 (g) 2 Fe2O3 (s) C) N2 (g) + 3 H2 (g) 2 NH3 (g) D) H2 (g) + Cl2 (g) 2 HCl (g) E) 2 SO3 (g) 2 SO2 (g) + O2 (g)
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In which of the following reactions would increasing pressure at constant temperature not change the concentrations of reactants and products, based on Le Chatelier's principle? A) N2 (g) + O2 (g) 2NO (g) B) N2O4 (g) 2NO2 (g) C) 2N2 (g) + O2 (g) 2N2O (g) D) N2 (g) + 3H2 (g) 2NH3 (g) E) N2 (g) + 2O2 (g) 2NO2 (g)
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A catalyst can increase the rate of a reaction __________. 20) A) by lowering the overall activation energy (Ea) of the reaction B) by lowering the activation energy of the reverse reaction C) by changing the value of the frequency factor (A) D) by providing an alternative pathway with a lower activation energy E) All of these are ways that a catalyst might act to increase the rate of reaction.
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A reaction was found to be second order in carbon monoxide concentration. The rate of the reaction __________ if the [CO] is doubled, with everything else kept the same. 15) A) is reduced by a factor of 2. B) triples C) doubles D) increases by a factor of 4 E) remains unchanged
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A reaction was found to be zero order in A. Increasing the concentration of A by a factor of 3 will cause the reaction rate to __________. 8) A) triple B) increase by a factor of 27 C) decrease by a factor of the cube root of 3 D) increase by a factor of 9 E) remain constant
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As the temperature of a reaction is increased, the rate of the reaction increases because the __________. A) reactant molecules collide more frequently with less energy per collision B) reactant molecules collide less frequently C) reactant molecules collide with greater energy per collision D) activation energy is lowered E) reactant molecules collide less frequently and with greater energy per collision
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At equilibrium, __________. 14) A) the rate constants of the forward and reverse reactions are equal B) all chemical reactions have ceased C) the rates of the forward and reverse reactions are equal D) the value of the equilibrium constant is 1 E) the limiting reagent has been consumed
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Consider the following reaction at equilibrium: 2NH3 (g) N2 (g) + 3H2 (g) H° = +92.4 kJ Le Chatelier's principle predicts that adding N2 (g) to the system at equilibrium will result in __________. 18) A) a decrease in the concentration of NH3 (g) B) an increase in the value of the equilibrium constant C) a decrease in the concentration of H2 (g) D) removal of all of the H2 (g) E) a lower partial pressure of N2
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Consider the following reaction: 3A 2B The average rate of appearance of B is given by [B]/t. Comparing the rate of appearance of B and the rate of disappearance of A, we get [B]/t = _____ × (-[A]/t). 13) A) +3/2 B) -3/2 C) -2/3 D) +1 E) +2/3
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If the rate law for the reaction 2A + 3B products is first order in A and second order in B, then the rate law is rate = ____________. 9) A) k[A][B] B) k[A]2[B]2 C) k[A]2[B]3 D) k[A]2[B] E) k[A][B]2
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The effect of a catalyst on an equilibrium is to __________. 10) A) increase the equilibrium constant so that products are favored B) increase the rate of the forward reaction only C) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixture D) slow the reverse reaction only E) shift the equilibrium to the right
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The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is __________. (1) SO2 (g) + (1/2) O2 (g) SO3 (g) (2) 2SO3 (g) 2SO2 (g) + O2 (g) 17) A) -K2 B) 2K C) 1/K2 D) 1/2K E) K2
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The equilibrium-constant expression depends on the __________ of the reaction. 5) A) stoichiometry and mechanism B) temperature C) mechanism D) stoichiometry E) the quantities of reactants and products initially present
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The rate law for a reaction is rate = k [A][B]2 Which one of the following statements is false? 11) A) The reaction is first order in A. B) If [B] is doubled, the reaction rate will increase by a factor of 4. C) The reaction is second order overall. D) k is the reaction rate constant E) The reaction is second order in B.
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The rate of a reaction depends on __________. 16) A) collision frequency B) collision orientation C) collision energy D) all of the above E) none of the above
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The reaction below is exothermic: 2SO2 (g) + O2 (g) 2SO3 (g) Le Chatelier's Principle predicts that __________ will result in an increase in the number of moles of SO3 (g) in the reaction container. 7) A) decreasing the pressure B) increasing the temperature C) increasing the pressure D) removing some oxygen E) increasing the volume of the container
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Which one of the following will change the value of an equilibrium constant? 12) A) changing temperature B) varying the initial concentrations of reactants C) varying the initial concentrations of products D) adding other substances that do not react with any of the species involved in the equilibrium E) changing the volume of the reaction vessel
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^ Consider the following reaction at equilibrium. 2CO2 (g) 2CO (g) + O2 (g) H° = -514 kJ Le Chatelier's principle predicts that the equilibrium partial pressure of CO (g) can be maximized by carrying out the reaction __________. A) at high temperature and high pressure B) at high temperature and low pressure C) at low temperature and low pressure D) at low temperature and high pressure E) in the presence of solid carbon
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