AP QUIZZES - AP TOPIC 13 Equilibrium SET E
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QUESTION 1. An equlibrium mixture of phosphorous pentachloride, phosphorous trichloride and chlorine is established, at a total pressure of 150. atm, where 1.00 mol of each substance is present at equilibrium. Calculate the Kp in atm.

PCl5(g) <==> PCl3(g) + Cl2(g)


(A) 150.
(B) 50
(C) 300.
(D) 0.333
(E) 0.015

QUESTION 2. If an industrial, commercial, chemical process that involves establishing an equilibrium reaction is found to favor products at low temperatures, what is the most likely reason that the reaction is NOT actually run at very low temperatures?

(A) Low temperatures are difficult to achieve
(B) The yield of products is poor at low temperatures
(C) Higher temperatures will yield more products
(D) The manufacturer is not concerned about the yield of products
(E) At low temperatures the reaction is too slow

QUESTION 3. Which of the following equilibria will have an equilibrium constant with NO units?

(A) H2(g) + I2(g) <==> 2HI(g)
(B) BaCO3(s) <==> BaO(s) + CO2(g)
(C) 2NO2(g) <==> 2NO(g) + O2(g)
(D) 2NO2(g) <==> N2O4(g)
(E) CO(g) + Br2(g) <==> COBr2(g)

QUESTION 4. Which of the following equilibria will have only one chemical species in the expression for K?

(A) H2(g) + F2(g) <==> 2HF(g)
(B) Na2CO3(s) <==> Na2O(s) + CO2(g)
(C) 2NO2(g) <==> 2NO(g) + O2(g)
(D) 2NO2(g) <==> N2O4(g)
(E) CO(g) + Cl2(g) <==> COCl2(g)

QUESTION 5. Which of the following equilibria will NOT be shifted by a change in the overall pressure?

(A) H2(g) + I2(g) <==> 2HI(g)
(B) CaCO3(s) <==> CaO(s) + CO2(g)
(C) 2NO2(g) <==> 2NO(g) + O2(g)
(D) 2NO2(g) <==> N2O4(g)
(E) CO(g) + Cl2(g) <==> COCl2(g)




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