Ch 12 Prac Test Kinetics1
A.P. Chemistry Practice Test: Ch. 12, Kinetics
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Consider the following reaction:
3A ¬ 2B
The average rate of appearance of B is given by D[B]/Dt. Comparing the rate of appearance of B and the rate of disappearance of A, we get D[B]/Dt = _____ x (-D[A]/Dt).
A) -2/3
B) -3/2
C) +2/3
D) +3/2
E) +1
2) A burning splint will burn more vigorously in pure oxygen than in air because
A) nitrogen is a reactant in combustion and its low concentration in pure oxygen catalyzes the combustion.
B) oxygen is a reactant in combustion and the concentration of oxygen is higher in pure oxygen than it is in air. C) oxygen is a product of combustion.
D) nitrogen is a product of combustion and the system reaches equilibrium at a lower temperature.
E) oxygen is a catalyst for combustion.
3) Of the following, all are valid units for a reaction rate except __________.
A) mol/L
B) M/s
C) mol/hr
D) mol/L-hr
E) g/s
A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) ¬B(g). The following data are obtained for [A] as the reaction proceeds:
Time (s)
Moles of A
1
0.124
10
0.110
20
0.088
30
0.073
40
0.054
4) The average rate of disappearance of A between 10 s and 20 s is __________ mol/s.
A) 1.1 ˛ 10-3
B) 4.4 ˛ 10-3
C) 454
D) 9.90 ˛ 10-3
E) 2.2 ˛ 10-3
The peroxydisulfate ion (S2O82-) reacts with the iodide ion in aqueous solution via the reaction:
S2O82- (aq) + 3I - ¬ 2SO4 (aq) + I3- (aq)
An aqueous solution containing 0.050 M of S2O82- ion and 0.072 M of I- is prepared, and the progress of the reaction followed by measuring [I- ]. The data obtained is given in the table below.
Time (s)
[I- ] (M)
0
400
800
1200
1600
0.072 0.057 0.046 0.037 0.029
5) The concentration of S 2O82- remaining at 800 s is _________ M.
A) 0.015
B) 0.041
C) 0.076
D) 4.00 ˛10-3
6) Of the units below, ________ are appropriate for a first-order
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Consider the following reaction:
3A ¬ 2B
The average rate of appearance of B is given by D[B]/Dt. Comparing the rate of appearance of B and the rate of disappearance of A, we get D[B]/Dt = _____ x (-D[A]/Dt).
A) -2/3
B) -3/2
C) +2/3
D) +3/2
E) +1
2) A burning splint will burn more vigorously in pure oxygen than in air because
A) nitrogen is a reactant in combustion and its low concentration in pure oxygen catalyzes the combustion.
B) oxygen is a reactant in combustion and the concentration of oxygen is higher in pure oxygen than it is in air. C) oxygen is a product of combustion.
D) nitrogen is a product of combustion and the system reaches equilibrium at a lower temperature.
E) oxygen is a catalyst for combustion.
3) Of the following, all are valid units for a reaction rate except __________.
A) mol/L
B) M/s
C) mol/hr
D) mol/L-hr
E) g/s
A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) ¬B(g). The following data are obtained for [A] as the reaction proceeds:
Time (s)
Moles of A
1
0.124
10
0.110
20
0.088
30
0.073
40
0.054
4) The average rate of disappearance of A between 10 s and 20 s is __________ mol/s.
A) 1.1 ˛ 10-3
B) 4.4 ˛ 10-3
C) 454
D) 9.90 ˛ 10-3
E) 2.2 ˛ 10-3
The peroxydisulfate ion (S2O82-) reacts with the iodide ion in aqueous solution via the reaction:
S2O82- (aq) + 3I - ¬ 2SO4 (aq) + I3- (aq)
An aqueous solution containing 0.050 M of S2O82- ion and 0.072 M of I- is prepared, and the progress of the reaction followed by measuring [I- ]. The data obtained is given in the table below.
Time (s)
[I- ] (M)
0
400
800
1200
1600
0.072 0.057 0.046 0.037 0.029
5) The concentration of S 2O82- remaining at 800 s is _________ M.
A) 0.015
B) 0.041
C) 0.076
D) 4.00 ˛10-3
6) Of the units below, ________ are appropriate for a first-order