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WorksheetsReaction kinetics & Chemical equilibrium
Total questions: 17
Worksheet time: 10mins
In an energy profile, the activated complex is represented at the
a. left end of the curve.
b. right end of the curve.
c. bottom of the curve.
d. top of the curve.
Increasing the surface area of the reactants in a heterogeneous reaction
a. tends to increase reaction rate.
b. tends to decrease reaction rate.
c. has no effect on reaction rate.
d. cancels the rate-determining step.
The energy change, ΔE , for a reaction is the energy difference between the
a. products and intermediates.
b. products and reactants.
c. products and the activated complex.
d. reactants and intermediates.
A substance that increases the rate of a chemical reaction without being consumed is a(n)
(a)
To be effective, a collision requires these two things: _________ and _________.
(a)
The activated complex is (a) in energy than the reactants.
If a collision between molecules is very gentle, the molecules are
A. more likely to be oriented favorably.
B. less likely to be oriented favorably.
C. likely to react.
D. likely to rebound without reacting.
A rate law relates
A. reaction rate and temperature.
B. reaction rate and concentration.
C. temperature and concentration.
D. energy and concentration.
A certain reaction is zero order in reactant A and second order in reactant B. What happens to the reaction rate when the concentrations of both reactants are doubled
A. The reaction rate remains the same.
B. The reaction increases by a factor of two.
C. The reaction rate increases by a factor of four.
D. The reaction rate increases by a factor of eight.
A chemical reaction is in equilibrium when
A. forward and reverse reactions have ceased.
B. the equilibrium constant equals 1.
C. forward and reverse reaction rates are equal.
D. No reactants remain.
A
B
C
D
If an exothermic reaction has reached equilibrium,
then increasing the temperature will
A. favor the forward reaction.
B. favor the reverse reaction.
C. favor both the forward and reverse reactions.
D. have no effect on the equilibrium.
Le Châtelier’s principle states that
A. at equilibrium, the forward and reverse reaction rates are equal.
B. stresses include changes in concentrations, pressure, and temperature.
C. to relieve stress, solids and solvents are omitted from equilibrium constant expressions.
D. chemical equilibria respond to reduce applied stress.
Which of the symbols below denotes the acid ionization constantv
a. K
b. Ka
c. Kb
d. Ke
A solution that can resist changes in pH is called a(n)
a. acidic solution.
b. basic solution.
c. salt solution.
d. buffered solution.
Hydrolysis is a reaction that occurs when water molecules
a. surround solute particles.
b. react with ions of a salt.
c. decompose to form H2 gas and O2 gas.
d. Both (a) and (c)
Which substance, at equilibrium, is likely to have the highest concentration?
a. CH3COOH
b. CH3COO–
c. H2O+
d. Both (b) and (c)
