1. Which of the following is true for a chemical reaction at equilibrium?

35. A reaction X + 2Y → 3Z is started with 1.0 M Z and no X or Y. To calculate the equilibrium concentrations of all species using an ICE table, which of the following would you enter in the Z column for the C row?

Many reactions occur in the formation of photochemical smog, including the reaction of ozone with various volatile organic chemicals, or VOCs. The table in the next column shows the Arrhenius expression for four such reactions.

Identify the highest rate constant at 25 ^oC among the Arrhenius equations above. 

The following rate constants were obtained in an experiment in which the decomposition of gaseous N₂O₅ was studied as a function of temperature. The products were NO₂ and NO₃.

   T (^oC)           k (s^-1)       

   41            0,31

   88            7,3

Determine Ea for this reaction in kJ/mol.  

55. Given: 2A(g) <=> B(g) + C(g) ΔH° = +27 kJ, K = 3.2 x 10^-4.

Which of the following would be true if the temperature were increased from 25°C to 100°C?

1. The value of K would be smaller.

2. The concentration of A(g) would be increased.

3. The concentration of B(g) would increase.

42. The energy profiles for four different reactions are shown. Which reaction requires the most energetic collisions to reach the transition state?

5. An equilibrium that strongly favors products has __________

14. For the reaction 2A + B <=> 2C the appropriate form for the equilibrium constant expression is:

47. Which of the following occurs when reactants are added to a chemical reaction in solution or the gas phase at equilibrium?

58. Given: A(s) + B(l) <=> C(g) + D(g) ΔH° = 84.3 kJ.

If the above reactants and products are contained in a closed vessel and the reaction system is at equilibrium, the number of moles of C can be decreased by which of the following? (Note that the reactants are solid and liquid.)