Vocabulary
What is a Reversible Reaction?
A reaction that can occur in both the forward and reverse directions.
Write equilibrium expressions for this equilibrium: N2O4(g)<---> 2NO(2)(g)
K = [NO2]2 /[N(2)O(4)]
State Le Chatelier's Principle.
An equilibrium system will shift in the direction which minimises the change imposed upon it
Equilibrium is a state of ______ balance.
Dynamic Balance.
What is given in mol/L.
concentration
What is Chemical Equilibrium?
A state in which the forward and reverse reactions balance each other because they take place at equal rates.
Write the equilibrium expression for this equilibrium:
CO(g) + 3H(2)g <--> CH(4)g + H(2)O(g)
What is K = [CH(4)][H(2)O] /[CO][H(2)]3
Can cause a change in both a Equilibrium's position and constant Keq.
Changes in Temperature.
What is the equilibrium for the Haber process?
N2 + 3H2 <--> 2NH3
Keq is the...
Equilibrium Constant.
What is Heterogeneous system?
When the reactants and products of a reaction are present in more than one physical state.
Write the equilibrium expression for this equilibrium:
C(10)H(8)s <--> C(10)H(8)g
K = [C(10)H(8)g]
Changes in what THREE factors can cause a shift in the equilibrium but NOT the Keq value?
What is Concentration, Volume, and Temperature.
If you increase the temperature of the NO2/N2O4 system, which way will it shift? How do you know? What does this tell you about the system?
Toward NO2
Reaction is endothermic in this direction
gas mixture becomes darker brown
What is a static equilibrium? What is an example?
A reversible reaction where the rates of the forward and reverse reactions is essentially zero
A slightly soluble solid
What is the Equilibrium Constant?
The numerical value of the ratio of product concentrations to reactant concentrations, with each concentration raised to the power corresponding to its coefficient in the balanced equation.
Write the Equilibrium expression for this equilibrium: H(2)O(l) <--> H(2)O(g)
K= [H(2)O(g)]
An increase in pressure for will cause a shift...
In the direction with less moles of gas
If oxygen is added to the system
2SO2 + O2 <--> 2SO3
What will initially happen?
What will happen to the value of Keq?
No change to value of Keq
Name and outline the principle used throughout this module.
What is Le Chatelier's Principle.
What happens when chemical equilibrium has been established?
The rates of the forward and reverse reactions are equal
The concentrations of reactants and products remains constant
Write the equilibrium expression for this equilibrium: CaCO(3)s <--> CaCO(s) + CO(2)g
K = [CO(2)g]
Increasing the temperature of a reaction will cause...
The reaction to shift in the endothermic direction
If you increase the temperature for the following reaction, which way will it shift?
N2 + 3H2 --> 2NH3 delta H= -92kJmol-1
What will happen to the value of Keq?
Shift left
Keq decreases
Which equilibrium that we study is linked to Mod 8?
Haber process