WorksheetsEquilibrium & Le Chatelier's Principle
Total questions: 30
Worksheet time: 15mins
SO2(g) + O2(g) <−> SO3(g)
If the concentration of SO2(g) is increased, the equilibrium of the reaction will ___________.
SO2(g) + O2(g) <−> SO3(g)
If the equilibrium shifts to the right, the concentration of O2(g) will ___________.
heat + N2(g) + O2(g) <−> 2NO(g)
If the heat is removed to the chemical system, the equilibrium will _______.
N2 (g) + 3 H2 (g) <−> 2 NH3 (g)
If the pressure in the system is increased, the reaction will __________________.
ΔHrxn= -453 kJ/mol
If the [B] is decreased then the reaction is will shift to the _______.
ΔHrxn= 240 kJ/mol
If the pressure decreases then the reaction will shift to the _____.
Removing O2(g) will
an in Increase temperature will...
Which is NOT a way to stress a closed chemical system at equilibrium?
change temperature
add a reactant
take away a chemical in the reaction
add a catalyst
A single sided arrow (→), indicates that a reaction is:
Reversible
Irreversible
Not reactive
A double sided arrow (↔), indicates that a reaction is:
Reversible
Irreversible
Not reactive
When the forward and reverse reactions are occurring at the same rate, the reaction is said to be at:
Chemical equilibrium
Chemical reaction
Chemical constant
Chemical peace
Which is the correct equilibrium constant expression for the following reaction?
Fe2O3(s) + 3H2(g) —> 2 Fe(s) + 3H2O(g)
K = [H2O]3 / [H2]3
K = [Fe2O3] [H2]3 / [Fe]2[H2O]3
K = [Fe]2[H2O]3 / [Fe2O3] [H2]3
K= [Fe] [H2O] / [Fe2O3] [H2]
K = [H2] / [H2O]
The equilibrium constant expression for the reaction 2BrF5(g) —> Br2(g) + 5 F2(g) is
Kc = [Br2] [F2] / [BrF5]
Kc = [BrF5]2 / [Br2][F2]5
Kc = [Br2] [F2]5 / [BrF5]2
Kc = 2[BrF5]2 / ([Br2] × 5[F2]5)
Kc = [Br2] [F2]2 / [BrF5]5
Calculate Kc for the reaction HI(g) —> H2(g) + I2(g) given that the concentrations of each species at equilibrium are as follows: [HI] = 0.85 mol/L, [I2] = 0.60 mol/L, [H2] = 0.27mol/L.
0.19
0.22
4.5
5.25
160
A very high value for K indicates that
reactants are favored.
products are favored.
equilibrium is reached slowly.
equilibrium has been reached
Changes in pressure will only affect substances that are in the ______ state.
solid
gas
liquid
Which of the two graphs reaches equilibrium?
Neither
The left
Both
The right
Which of the following is NOT true at equilibrium?
The concentrations of reactants and products do not change.
The forward and reverse reactions proceed at the same rate.
The concentration of the reactants is equal to the concentration of the products.
The forward and reverse reactions continue to occur.
Select all of the statements that are always correct about dynamic equilibrium
established when the product and reactant concentrations are equal
achieved when the forward and reverse reaction rates are same
established when the concentration of reactants is unchanging
achieved when the concentration ratio of reactants to products becomes stable
achieved when the forward and reverse reactions stop occurring
What states of matter are omitted when writing Keq expressions?
solids and liquids
aqueous solutions and gas
solids, liquids, aqueous solutions and gases
aqueous solutions & liquids
When Keq < 1,
There are more products than reactants when the reaction reached equilibrium.
There are more reactant than products when the reaction reached equilibrium.
The amount of reactants is equal to the amount of products.
How would the equilibrium change for the reaction 2 HgO (s) <--> Hg (l) + O2 (g) if more HgO was ADDED
Right ; toward products
Left ; toward reactants
no change because HgO is a solid
