Kinetics V

In the potential energy diagram below, which represents the activation energy for the catalysed reaction?
1. A
2. B
3. C
4. D
In a reaction Ea _(forward) is 28 kJ and Ea _(reverse) is 54 kJ. Which describes the forward reaction?
1. Endothermic, ΔH= -26kJ
2. Endothermic, ΔH= 26kJ
3. Exothermic, ΔH= -26kJ
4. Exothermic, ΔH= 26kJ
Marble chips and chalk dust are different forms of CaCO₃ (s). Which explains the difference in the reaction rate of each with vinegar?
1. concentration
2. pressure
3. surface area
4. temperature
Which refers to each single step in a reaction mechanism?
1. activated complex
2. elementary
3. intermediate
4. rate determining
Which substance, when added to the reaction mechanism below, will have the greatest effect on the overall reaction rate?

Step 1: OCl^- + H₂O → HOCl + OH^- fast

Step 2: I^- + HOCl → HOI + Cl^- slow

Step 3: HOI + OH^- → H₂O + OI^- fast
1. HOI
2. H₂O
3. I^-
4. OCl^-
Which predicts how an equilibrium responds to imposed changes?
1. Arrhenius definition
2. Faraday’s law
3. Hess’ law
4. Le Châtelier’s principle
Which change in the equilibrium below will result in the highest concentration of NO(g)?

N₂(g) + O₂(g) ⇌ 2 NO(g) ΔH = + 182.6 kJ
1. adding a catalyst
2. increasing pressure
3. increasing temperature
4. removing oxygen
The reaction below is allowed to reach equilibrium. If O₂(g) is added to the system, what is the effect on the value of [CO₂(g)] and the value of K?

2CO(g) + O₂(g) ⇌ 2CO₂(g) + heat
1. [CO₂(g)] decrease, K constant
2. [CO₂(g)] decrease, K increase
3. [CO₂(g)] increase, K constant
4. [CO₂(g)] increase, K increase
When the reaction below is at equilibrium, [Cl₂] = 4.4 × 10^-4 mol/L, [N₂] = 1.4 × 10^-3 mol/L, and [NCl₃] = 1.9 × 10^-1 mol/L. What is the value of K?

3Cl₂(g) + N₂(g) ⇌ 2NCl(g)
1. 3.3 x 10^-12
2. 3.2x 10^-6
3. 3.1 x 10⁵
4. 3.0 x 10¹¹
What is the equilibrium expression for the reaction below?

2SO₂(g) + O₂(g) ⇌ 2SO₃(g)
1. [SO₃]
  [SO₂][O₂]
2. [SO₃]²
  [SO₂]²[O₂]
3. [SO₂][O₂]
  [SO₃]
4. [SO₂]²[O₂]
  [SO₃]²
For the equilibrium below, the concentration of CO(g) and Cl₂(g) are both 0.200 mol/L. What is the equilibrium concentration of COCl₂?

CO(g) + Cl₂(g) ⇌ COCl₂(g) K = 21
1. 0.21
2. 0.84
3. 1.2
4. 4.2
A sample of ammonia is placed in a sealed vessel and allowed to reach equilibrium. Using the graph below, what is the value of K?
1. 0.029
2. 0.30
3. 3.4
4. 34

Kinetics V

Quiz