Chapter 15 Flashcards
Chemical equilibrium
A state in which the forward and reverse reactions are occurring at the same rate.
Haber process
N2(g)+3H2(g) = 2NH3(g)
Law of mass action
The relationship between the concentrations of the reactants and products of a systen at equiliberium.
Equilibrium constant expression for (A+bB = dD+eE)
Kc= [D]^d[E]^e / [A]^a[B]^b
Kc is a dimentionless constant called the ______
equiliberium constant
Kp=_____
Kc(RT)^delta n
Kp=
(PD)^d(PE)^e /(PA)^a (PB)^b
The value of the equilibrium constant changes with temperature. A large value of Kc indicates that the equiliberium mixture contains more products/reactant than reactants/products.
products
reactants
If a reaction is the sum of two or more reactions, its equilibrium constant will be the product of the equilibrium constants for the individual reactions.
.
Equiliberia for which all substances are in the same phase are called ________
homogeneous equilibria
In _________ _______ equilibria , two pr more phases are present.
heterogeneous equiliberia
liquids and solids are included/excluded by the equilibria constant expression for a heterogenious equiliberium
excluded (because their activities = 1)
Stoich matters for calculating concentrations
true dat
The reaction quotient is denoted :
Q
Q is calculated by substituting reactant and product concentrations or partial pressures at any point during a reif action into the equil constant expression
.
if the system is at equilliberium ______
Q=K
if Q does not equal K the system is/is not at equilliberium
is not.
When Q<K the reaction will move toward equilliberium by forming more products/reactants
products (left to right)
When Q>K the reaction will move toward equilliberium by forming more products/reactants
reactants (right to left)
Le Chaterlier’s principle States
If a system at equlibrium is disturbed, the quilibrium will shift to minimize the disturbing influence.
If a reactant or product is added to a system at equiliberium, the system will compensate forming a new equilliberium.
true dat mutha man
If volume is reduced the system
will shift in the direction that reduces gas molecules
Changes in pressure and concentration do/do not effect the K value
it’s constant bitch
do not
For an endothermic reaction an enthalpy change, an increase/decrease in temperature will shift the equation right
increase
a decrease will shift it left
