Chemical Equilibrium : By Kenneth Romero Chemical Equilibrium What is Equilibrium? : What is Equilibrium? Equilibrium occurs when two opposing forces occur the same rate
At chemical Equilibrium the rate of the forward reaction is equal to the rate of the reverse reaction Recognizing Equilibrium : Recognizing Equilibrium To recognize equilibrium one must look for:
Equal Rates in both forward and reverse reactions
We recognize equilibrium by observing a constant macroscopic condition
Look at constant Pressure, Volume, or Temperature Real Life Example : Real Life Example A Real life example of equilibrium is the rate of people entering is equal to the rate of people leaving.. BEACH OUTSIDE Lets GO!! Lets Leave! Equilibrium Constant : Equilibrium Constant The equilibrium constant is a measure of extent to which a reaction proceeds to completion. By looking at the constant you can see how great the mixture of reactants or products are.
If keq >> 1 Equilibrium lies to the right
If keq<< 1 Equilibrium lies to the left
If keq = 1 Equilibrium lies in the middle Keq 1 Contrasting Q & Keq : Contrasting Q & Keq Reaction quotient (Q) is used to determine if a reaction is at equilibrium
Keq deals with the concentration of reactions and products during equilibrium
Q deals with concentrations of reactions & products anytime during a reaction. If Q < Keq the reaction needs to proceed to the right to achieve equilibrium
If Q > Keq the reaction needs to proceed to the left to achieve equilibrium
If Q = Keq the reaction is at equilibrium Keq Q Finding Equilibrium : Finding Equilibrium Keq is equal to the concentration of the products raised to the power of the coefficients divided by the concentration of the reactants raised to the power of the coefficient. Example 2 NO2 N2O2 Keq = [N2 O2]
[NO2] 2 The reaction quotient is used to determine if a reaction is at equilibrium. Keq = [NH3]
[N2][H2] 2 3 [NH3] = 0.15M, [N2] = .0020, [H2] = .10 Q = ____(.15)____
=1.1 x 10 2 3 4 Q< keq therefore the reaction will proceed to the right Le Chateliers principle : Le Chateliers principle Le Chateliers Principle explains what happens in chemical reactions when a disruption occurs at equilibrium.
Factors that effect Equilibrium
Concentration Le Chatliers Principle - Example : Le Chatliers Principle - Example C(s) + CO2 + heat 2CO(g) Heat Press CO2 Reverse Reaction Forward Reaction END : END Thank you… Please give me an A ?