Class Notes (1,015,201)
CA (583,795)
AU (533)
(10)
sbc 200 (10)
idk (10)
Lecture 6

sbc 200 Lecture Notes - Lecture 6: Chemical EquilibriumPremium

2 pages27 viewsFall 2016

Department
biotechnology
Course Code
sbc 200
Professor
idk
Lecture
6

This preview shows half of the first page. to view the full 2 pages of the document.
The Equilibrium State
All reactions are reversible and under suitable conditions will reach a state of
equilibrium
At equilibrium, the concentrations of products and reactants no longer change
because the rates of the forward and reverse reactions are equal.
Chemical equilibrium is a dynamic state
The Equilibrium Constant
K= Kforward/Kreverse
K and the extent of reaction
K reflects a particular ratio of product concentrations to reactant concentrations
for a reaction.
A small value for K indicates that the reaction yields little product before reaching
equilibrium. The reaction favors the reactants
A large value for K indicates that the reaction reaches equilibrium with very little
reactant remaining. The reaction favors the products.
The Reaction Quotient Q
Q = [C]^c[D]^d/ [A]^a[B]^b
gives the ratio of product concentrations to reactant concentrations at any point
in a reaction.
At equilibrium: Q = K
Forms of K and Q
For an overall reaction that is the sum of two more individual reactions:
Qoverall = Q1 x Q2 x Q3 x ….. And
Koverall = K1 x K2 x K3 x
Qc(rev)=1/ Qc(fwd) & Kc(rev)=1/ Kc(fwd)
K and Q for hetereogeneous equilibrium
A hetereogeneous equilibrium involves reactants and/ or products in different
phases.
Pure solids and liquids are omitted from the expression for Q or K
Determining the Direction of Reaction
The value of Q indicates the direction in which a reaction must proceed to reach
equilibrium.
If Q < K, the products must increase and the reactant decrease; reactants →
products until equilibrium is reached.
If Q > K, the reactants must increase and the products decrease; products →
reactants until equilibrium is reached.
find more resources at oneclass.com
find more resources at oneclass.com
You're Reading a Preview

Unlock to view full version

Subscribers Only

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.