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Lesson 1: Chemical Reaction Rates and Le Chatelier’s Principle — Picture questions (exam style)

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  • Questions count: 40
  • Passing grade: 60%
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1.
For the reaction shown Kc = 0.5. The table gives concentrations (mol L−1) at one instant. Which option is correct?
For the reaction shown Kc = 0.5. The table gives concentrations (mol L⁻¹) at one instant. Which option is correct?
Q = 31.2, the reaction proceeds not at all (at equilibrium)
Q = 31.2, the reaction proceeds backward
Q = 62.5, the reaction proceeds forward
Q = 1.67, the reaction proceeds not at all (at equilibrium)
2.
For the equilibrium shown (ΔH = -92 kJ), what is the effect of lowering temperature on Kc and on the position of equilibrium?
For the equilibrium shown (ΔH = -92 kJ), what is the effect of lowering temperature on Kc and on the position of equilibrium?
Kc unchanged, equilibrium shift: no shift
Kc decreases, equilibrium shift: no shift
Kc unchanged, equilibrium shift: forward
Kc increases, equilibrium shift: forward
3.
5 mol N₂O₄ in a 5 L vessel gives 4.0 mol NO₂ at equilibrium. Find Kc.
5 mol N₂O₄ in a 5 L vessel gives 4.0 mol NO₂ at equilibrium. Find Kc.
1.07
5.33
1.33
0.640
4.
The energy profile is for a reaction. What is ΔH?
The energy profile is for a reaction. What is ΔH?
-40 kJ/mol
60 kJ/mol
40 kJ/mol
20 kJ/mol
5.
For the equilibrium shown (ΔH = 57 kJ), what is the effect of increasing pressure on Kc and on the position of equilibrium?
For the equilibrium shown (ΔH = 57 kJ), what is the effect of increasing pressure on Kc and on the position of equilibrium?
Kc unchanged, equilibrium shift: backward
Kc decreases, equilibrium shift: forward
Kc unchanged, equilibrium shift: forward
Kc increases, equilibrium shift: backward
6.
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
110 kJ/mol
156.6 kJ/mol
180 kJ/mol
90 kJ/mol
7.
4 mol H₂ and 4 mol I₂ are put in a 2 L vessel; at equilibrium 3.2 mol HI has formed. Find Kc.
4 mol H₂ and 4 mol I₂ are put in a 2 L vessel; at equilibrium 3.2 mol HI has formed. Find Kc.
16.0
0.640
1.11
1.78
8.
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
120 kJ/mol
60 kJ/mol
40 kJ/mol
104.4 kJ/mol
9.
For the reaction shown Kc = 4. The table gives concentrations (mol L−1) at one instant. Which option is correct?
For the reaction shown Kc = 4. The table gives concentrations (mol L⁻¹) at one instant. Which option is correct?
Q = 0.08, the reaction proceeds forward
Q = 0.08, the reaction proceeds backward
Q = 0.4, the reaction proceeds forward
Q = 0.08, the reaction proceeds not at all (at equilibrium)
10.
For the equilibrium shown (ΔH = 52 kJ), what is the effect of adding a catalyst on Kc and on the position of equilibrium?
For the equilibrium shown (ΔH = 52 kJ), what is the effect of adding a catalyst on Kc and on the position of equilibrium?
Kc decreases, equilibrium shift: forward
Kc decreases, equilibrium shift: backward
Kc unchanged, equilibrium shift: backward
Kc unchanged, equilibrium shift: no shift
11.
3 mol H₂ and 3 mol I₂ are put in a 5 L vessel; at equilibrium 0.75 mol HI has formed. Find Kc.
3 mol H₂ and 3 mol I₂ are put in a 5 L vessel; at equilibrium 0.75 mol HI has formed. Find Kc.
0.0816
0.544
0.111
0.0625
12.
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
120 kJ/mol
104.4 kJ/mol
180 kJ/mol
60 kJ/mol
13.
5 mol PCl₅ is heated in a 5 L vessel; 3.0 mol dissociates at equilibrium. Find Kc.
5 mol PCl₅ is heated in a 5 L vessel; 3.0 mol dissociates at equilibrium. Find Kc.
1.50
0.360
0.900
4.50
14.
The energy profile is for a reaction. What is ΔH?
The energy profile is for a reaction. What is ΔH?
210 kJ/mol
60 kJ/mol
150 kJ/mol
-60 kJ/mol
15.
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
40 kJ/mol
60 kJ/mol
160 kJ/mol
100 kJ/mol
16.
For the equilibrium shown (ΔH = -197 kJ), what is the effect of increasing pressure on Kc and on the position of equilibrium?
For the equilibrium shown (ΔH = -197 kJ), what is the effect of increasing pressure on Kc and on the position of equilibrium?
Kc unchanged, equilibrium shift: no shift
Kc decreases, equilibrium shift: no shift
Kc unchanged, equilibrium shift: forward
Kc increases, equilibrium shift: backward
17.
The energy profile is for a reaction. What is ΔH?
The energy profile is for a reaction. What is ΔH?
-60 kJ/mol
60 kJ/mol
90 kJ/mol
150 kJ/mol
18.
For the equilibrium shown (ΔH = 88 kJ), what is the effect of raising temperature on Kc and on the position of equilibrium?
For the equilibrium shown (ΔH = 88 kJ), what is the effect of raising temperature on Kc and on the position of equilibrium?
Kc decreases, equilibrium shift: backward
Kc increases, equilibrium shift: forward
Kc decreases, equilibrium shift: forward
Kc unchanged, equilibrium shift: backward
19.
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
80 kJ/mol
40 kJ/mol
60 kJ/mol
-20 kJ/mol
20.
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
60 kJ/mol
20 kJ/mol
40 kJ/mol
80 kJ/mol
21.
4 mol H₂ and 4 mol I₂ are put in a 5 L vessel; at equilibrium 2.0 mol HI has formed. Find Kc.
4 mol H₂ and 4 mol I₂ are put in a 5 L vessel; at equilibrium 2.0 mol HI has formed. Find Kc.
0.250
1.00
0.444
1.11
22.
The energy profile is for a reaction. What is ΔH?
The energy profile is for a reaction. What is ΔH?
150 kJ/mol
-40 kJ/mol
190 kJ/mol
40 kJ/mol
23.
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
180 kJ/mol
-20 kJ/mol
200 kJ/mol
160 kJ/mol
24.
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
120 kJ/mol
160 kJ/mol
80 kJ/mol
40 kJ/mol
25.
For the reaction shown Kc = 1. The table gives concentrations (mol L−1) at one instant. Which option is correct?
For the reaction shown Kc = 1. The table gives concentrations (mol L⁻¹) at one instant. Which option is correct?
Q = 0.222, the reaction proceeds not at all (at equilibrium)
Q = 5, the reaction proceeds not at all (at equilibrium)
Q = 0.2, the reaction proceeds not at all (at equilibrium)
Q = 0.2, the reaction proceeds forward
26.
The energy profile is for a reaction. What is ΔH?
The energy profile is for a reaction. What is ΔH?
-40 kJ/mol
40 kJ/mol
100 kJ/mol
60 kJ/mol
27.
The energy profile is for a reaction. What is ΔH?
The energy profile is for a reaction. What is ΔH?
20 kJ/mol
-60 kJ/mol
60 kJ/mol
80 kJ/mol
28.
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
48 kJ/mol
32 kJ/mol
68 kJ/mol
80 kJ/mol
29.
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
60 kJ/mol
-30 kJ/mol
90 kJ/mol
150 kJ/mol
30.
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
160 kJ/mol
-40 kJ/mol
120 kJ/mol
80 kJ/mol
31.
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
From the diagram, what is the activation energy of the reverse (uncatalysed) reaction?
240 kJ/mol
-40 kJ/mol
200 kJ/mol
160 kJ/mol
32.
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
80 kJ/mol
60 kJ/mol
200 kJ/mol
120 kJ/mol
33.
The energy profile is for a reaction. What is ΔH?
The energy profile is for a reaction. What is ΔH?
200 kJ/mol
-90 kJ/mol
290 kJ/mol
90 kJ/mol
34.
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
92 kJ/mol
48 kJ/mol
120 kJ/mol
72 kJ/mol
35.
The energy profile is for a reaction. What is ΔH?
The energy profile is for a reaction. What is ΔH?
-40 kJ/mol
40 kJ/mol
120 kJ/mol
80 kJ/mol
36.
1 mol N₂O₄ in a 2 L vessel gives 0.25 mol NO₂ at equilibrium. Find Kc.
1 mol N₂O₄ in a 2 L vessel gives 0.25 mol NO₂ at equilibrium. Find Kc.
0.0312
0.286
0.0714
0.0357
37.
The energy profile is for a reaction. What is ΔH?
The energy profile is for a reaction. What is ΔH?
-20 kJ/mol
20 kJ/mol
80 kJ/mol
100 kJ/mol
38.
The energy profile is for a reaction. What is ΔH?
The energy profile is for a reaction. What is ΔH?
-20 kJ/mol
20 kJ/mol
180 kJ/mol
160 kJ/mol
39.
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
80 kJ/mol
28 kJ/mol
48 kJ/mol
32 kJ/mol
40.
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
From the diagram, what is the forward activation energy with the catalyst (dashed curve)?
12 kJ/mol
120 kJ/mol
72 kJ/mol
48 kJ/mol
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