Multiple-Choice Questions B. For this reaction the value of the 1) Shown below i
ID: 1030214 • Letter: M
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Multiple-Choice Questions B. For this reaction the value of the 1) Shown below is a concentration vs. time plot for the reaction A equilibrium constant is 100 D) Kc- 0.060 E) Kc-0.05o Answer: 2) Consider the following generalized buffer solution equilibrium BH'(aq) + H2O()-HO'(aq) + B(aq) When a small amount of a strong base such as sodium hydroxide is added to the solution, which of these species would experience an increase in concentration? A) BH B) H:O C)HO D) B E) None of the species would increase in concentration. Answer: ( 3) Sodium bicarbonate (NaHCOs) undergoes thermal decomposition as follows: Which statement concerning the thermal decomposition of sodium bicarbonate is true? A) In a closed vessel, adding more sodium bicarbonate will have no effect on the equilibrium system. B) In an open vessel, adding more sodium bicarbonate will have no effect on the equilibrium system. C) In a closed vessel, adding more sodium bicarbonate will shift the equilibrium system from left to right. D) In a closed vessel, adding more sodium bicarbonate will shift the equilibrium system from right to left. E) In an open vessel, adding more sodium bicarbonate will shift the equilibrium system from right to left. Answer: ( 4) The equilibrium constant, Kp. equals 3.40 at 25°C for the isomerization reaction: cis-2-butene trans-2-butene. If a flask initially contains 1.00 atm of each gas, in what direction will the system shift to reach equilibrium? A) It will shift from left to right. B) It will shift from right to left. C) The system is already at equilibrium. D) The system is not at equilibrium and will remain in an unequilibrated state. E) According to Le Châtelier's Principle, no stress is applied to this equilibrium system, hence it remains at equilibrium state. Answer: (Explanation / Answer
1. Ans Kc > 1.
Kc= 0.05÷0.02 = 2.5
2. A. BH+.
as the base would abstract proton.
3. Ans (c)
By le chaterlier principle. As concentration of reactant increases it tends to increases in concentration of product.
4. For intial condition Q = reaction quotient = 1÷1=1 which is less than Kp hence reaction moves from left to right.
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