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At equilibrium, __________.A) all chemical reactions have ceasedB) the rates of the forward and reverse reactions are equalC) the rate constants of the forward and reverse reactions are equalD) the value of the equilibrium constant is 1E) the limiting reagent has been consumed2. What is the expression for Kc for the following reaction? NH4Cl(s) = HCl(g) + NH3(g) A) 1/[HCl][NH3]B) [HCl][NH3]C) [NH4Cl]/[HCl][NH3]D) [HCl][NH3]/[NH4Cl]E) [NH4Cl]3. At 800 ºC, Keq = 0.0100 for the following reaction: 2SO2(g) + O2(g) = 2SO3(g) What is the numerical value for the equilibrium constant for this reaction: 4SO3(g) = 4SO2(g) + 2O2(g) [enter integer]4. At 700ºC, Keq = 0.0152 for the following reaction: 2SO2(g) + O2(g) = 2SO3(g) What is numerical value of the equilibrium constant for the reverse reaction? [enter number with one decimal place]5. The effect of a catalyst on an equilibrium is to __________.A) increase the rate of the forward reaction onlyB) increase the equilibrium constant so that products are favoredC) slow the reverse reaction onlyD) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixtureE) shift the equilibrium to the right6. At 373 K, Keq = 2.39 for the following reaction: SO2Cl2(g) = SO2(g) + Cl2(g)In an equilibrium mixture of the three gases, the partial pressures of SO2Cl2 and SO2 are 3.31 atm and 1.59 atm, respectively. What is the partial pressure of Cl2 in the equilibrium mixture?A) 8.34 atmB) 4.98 atmC) 2.39 atmD) 1.23 atmE) It cannot be determined from the information provided.7. At 295 K, Keq = 7.0 x 10−2 for the following equilibrium: NH4HS(s) = NH3(g) + H2S(g) What is the equilibrium partial pressure (in atm) of H2S if a solid sample of NH4HS is placed in a closed container and allowed to reach equilibrium at 295 K? [enter number with two decimal places] 8. A mixture of 1.374 g of H2 and 70.31 g of Br2 is heated in a 2.00-L flask at 700 K. The following equilibrium is established: H2(g) + Br2(g) = 2HBr(g) At equilibrium the vesel is found to contain 0.566 g of H2. What is Kp for this reaction? [enter number with one decimal place] 9. For an endothermic reaction, heating the reaction vessel will cause the equilibrium to shift to the products.A) TrueB) False10. Consider the following reaction at equilibrium: 2NH3(g) = N2(g) + 3H2(g)Le Chatelier’s principle predicts that the moles of H2 in the reaction container will increase with __________A) some removal of NH3 from the reaction vessel (V and T constant)B) a decrease in the total pressure (T constant)C) addition of some N2 to the reaction vessel (V and T constant)D) a decrease in the total volume of the reaction vessel (T constant)E) an increase in total pressure by the addition of helium gas (V and T constant



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