CHM135H1 Study Guide - Midterm Guide: Hypobromous Acid, Reaction Rate Constant, Phenylalanine

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12 Mar 2014
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Multiple Choice Questions
1. Which of the following is incorrect?
a) Kc and Kp are not usually equal.
b) A large equilibrium constant (Kc>103) indicates that products are favored in equilibrium.
c) The addition of a catalyst does not shift the equilibrium in either way.
d) In equilibrium, forward and reserved reactions have the same rate constants.
e) The equilibrium constant is temperature dependent.
2. Which of the following cannot be the units of the rate constant
a) 1/(Ms)
b) M/s
c) Ms
d) M7/s
e) M4/s
3. A certain reaction has an activation energy of 83 kJ/mol. If the rate constant of this reaction is
2.1x10-2s-1 at 150 °C, what is the rate constant at 300°C?
a) 1 s
b) 10 s-1
c) 0.02 s-1
d) 6.3 s-1
e) 9.7 s-1
4. The following reactions involving bromine and chlorine all occur in water
1. BrCl + H2O HOBr + Cl- + H+ K1 = 1.8 x 10-5
2. BrCl + Br- Br2Cl- K2 = 1.8 x 104
3. Br2Cl- Br2 + Cl- K3 = 1.3
What is the equilibrium constant for the net reaction Br2 + H2O HOBr + Br- + H+ in the
presence of chloride, and would you expect the equilibrium to favour products or reactants?
a) K = 7.7 x 10-10, favouring reactants
b) K = 7.7 x 1010, favouring products
c) K = 3.8 x 10-5, favouring reactants
d) K = 1.9 x 10-2, favouring reactants
e) K = 1.9 x 102, favouring products
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5. The equilibrium constant Kp for the reaction below is 2x10-42 at 25°C
2H2O (g) 2H2 (g) + O2 (g)
What is Kc for the reaction at the same temperature?
a) 8 x 10-46
b) 8 x 10-42
c) 8 x 10-44
d) 5 x 10-39
e) 3 x 10-36
6. A mixture of 5.75 atm of H2 and 5.75 atm of I2 is placed in a 1.0L vessel at 430°C. The equilibrium
constant for the reaction : H2 (g) + I2 (g) 2HI (g)
At this temperature is KP = 54.3. What is the partial pressure of HI, in equilibrium?
a) 4.52 atm
b) 9.04 atm
c) 1.23 atm
d) 5.75 atm
e) 42.37 atm
7. Which of the following can be shown to be both a Brønsted acid and a Brønsted base?
a) No3-
b) PO4-3
c) F-
d) HCO3-
e) CIO4-
8. The value of KW for water at body temperature (37°C) is 2.1 x 10-14. Calculate the pH.
a) 7.0
b) 6.8
c) 7.4
d) 5.4
e) 8.2
9. A 100 ml sample of 0.1 M CH3NH2Kb = 3.7 x 10-4 is titrated with 0.25 M HNO3. Calculate the pH
after addition of 40ml.
a) 5.85
b) 6.28
c) 2.29
d) 2.72
e) 7.00
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