mid 2 - 1 1. -> 2. When a chemical system is at...

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1 1. When a chemical system is at equilibrium, the: a. concentrations of the reactants are equal to the concentrations of the products ----> b. concentrations of the reactants and products have reached constant values c. forward and reverse reactions have stopped d. reaction quotient, Q c , has reached a maximum e. reaction quotient, Q c , has reached a minimum 2. Given: H 2 (g) + I 2 (g) < == > 2 HI (g) , where K p = 55.2 at 425 °C. If a sealed flask at this temperature contains 0.127 atm of H 2 , 0.134 atm of I 2 , and 1.055 atm of HI, is the system at equilibrium? a. yes b. no, the reaction will shift in the forward direction in order to establish equilibrium ----> c. no, the reaction will shift in the reverse direction in order to establish equilibrium d. the volume of the flask must be given to know with certainty e. the initial partial pressures of each gas must be given to know with certainty 3. Which of the following has an effect on the magnitude on the equilibrium constant? a. the activation energy of the forward and reverse reactions b. concentrations of the reactants and products c. presence of a catalyst d. change in the volume of the container ----> e. change in the temperature 4. When sodium carbonate is added to water, it hydrolyzes according to the following two reactions: (1) CO 3 2- (aq) + H 2 O (l) < == > HCO 3 - (aq) + - OH (aq) K c(1) (2) HCO 3 - (aq) + H 2 O (l) < == > H 2 CO 3 (aq) + - OH (aq) K c(2) What is the equilibrium constant, K
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This note was uploaded on 10/07/2009 for the course CHEM 1022 taught by Professor Leopold during the Fall '08 term at Minnesota.

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mid 2 - 1 1. -&gt; 2. When a chemical system is at...

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