Kinetics and Equilibrium

Kinetics and Equilibrium - Unit 12: Kinetics and...

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Unit 12: Kinetics and Equilibrium – 50 point quiz (MC = 2 points each, SA = 10 points) 1. Which statement must be true when solution equilibrium occurs? a. The solution is at STP b. The solution is supersaturated c. The concentration of the solution remains constant d. The masses of the dissolved solute and the undissolved solute are equal 2. Given the equation representing a phase change at equilibrium: C 2 H 5 OH(l) ↔ C 2 H 5 OH(g), which statement is true? a. The forward process proceeds faster than the reverse process b. The reverse process proceeds faster than the forward process c. The forward process and reverse processes proceed at the same rates d. The forward and reverse processes both stop 3. Given the equation representing a reaction at equilibrium: N 2 (g) + 3H 2 (g) ↔ 2NH 3 (g) + energy, which change will cause the equilibrium to shift to the right? a. Decreasing the concentration of H 2 (g) b. Decreasing the pressure c. Increasing the concentration of N 2 (g) d. Increasing the temperature 4. Which statement must be true for any chemical reaction at equilibrium? a. The concentration of the products is greater than the concentration of the reactants. b. The concentration of the products is less than the concentration of the reactants. c. The concentration of the products and the concentration of the reactants are equal. d. The concentration of the products and the concentration of the reactants are constant. 5. Given the system at equilibrium, 2POCl 3 (g) + energy ↔ 2PCl 3 (g) + O 2 (g), which changes occur when O 2 (g) is added to this system? a. The equilibrium shifts to the right and the concentration of PCl 3 (g) increases. b. The equilibrium shifts to the right and the concentration of PCl 3 (g) decreases. c. The equilibrium shifts to the left and the concentration of PCl 3 (g) increases. d. The equilibrium shifts to the left and the concentration of PCl 3 (g) decreases. 6. Which statement must be true about a chemical system at equilibrium? a. The forward and reverse reactions stop b. The concentration of reactants and products are equal c. The rate of the forward reaction is equal to the rate of the reverse reaction d. The number of moles of reactants is equal to the number of moles of product 7. Given the reaction at equilibrium: N 2 (g) + 3H 2 (g) ↔ 2NH 3 (g) + 91.8 kJ. What occurs when the concentration of H 2 (g) is increased?
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This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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Kinetics and Equilibrium - Unit 12: Kinetics and...

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