WorksheetsEquilibrium
Total questions: 12
Worksheet time: 17mins
At equilibrium
All chemical processes have stopped.
The [Reactants] = [Products]
The concentration of the reactants and products are constant and no longer change.
The energy levels of the reactants and products are the same.
Which of these will change the value of the equilibrium constant?
Increasing the initial concentration of a reactant.
Increasing the temperature of the system.
Increasing the pressure for a gas phase reaction.
All of these will change the equilibrium constant.
The concentrations of reactants and products remain constant.
Interconversions between reactants and products still proceed.
Select the equilibrium constant for the most reactant favored system.
3.0×10−3
7.0×10−3
8.0×10−5
2.0×10−5
When Q is greater than Kc what will happen?
The [Reactants] will increase and [Products] will decrease.
The [Reactants] will decrease and [Products] will increase.
The [Reactants] and [Products] will both increase.
The [Reactants] and [Products] will both decrease.
What is the equilibrium expression for:
Fe3O4(s) + 4H2(g) ⇄ 3Fe(s) + 4H2O(g)
Kc =
[Fe3O4][H2]4[Fe]3[H2O]4
[H2O]4[H2]4
[H2]4[H2O]4
[Fe]3[H2O]4[Fe3O4][H2]4
For the reaction
N2 (g) + 3 H2(g) ⇄ 2 NH3 (g)
If the pressure in the system is increased, which substance(s) will have a higher conentration after equilibrum is reattained?
all 3 gases
N2 and H2
NH3
The concentrations wouldn't change.
2 SO2(g) + O2(g) ⇄ 2 SO3(g)
Adding SO2(g) will
shift equilibrium right
shift equilibrium left
increase Kc
not cause a shift
2 SO2(g) + O2(g) ⇄ 2 SO3(g)
Removing O2(g) will
shift equilibrium right
shift equilibrium left
increase pressure
have no change
Decreasing the temperature of an endothermic reaction will cause
equilibria to shift left and K increases
equilibria to shift left and K decreases
equilibria to shift right and K increases
equilibria to shift right and K decreases
3 A2(g) ⇄ 2 A3(g)
The initial concentration of A2 is 1.80 M. At equilibrium, the concentration of A3 is 0.50 M. What is the equilibrium concentration of A2?
0.25
0.75
1.05
1.80
For the reaction PCl5(g) ⇄ PCl3(g) + Cl2(g), Kc = 0.74 at a certain temperature. If the initial concentrations are 0.25 M PCl5, 0.20 M PCl3, and 2.25 M Cl2, predict the direction the reaction would shift to attain equilbrium.
left towards the reactants because Q = 0.56
left towards the reactants because Q = 1.8
right towards the products because Q = 0.56
right towards the products because Q = 1.8
