Equilibrium and stresses

Terms in this set (17)

The equilibrium will shift in order to reduce that stress
What happens when a system at equilibrium is subjected to a stress (change)?
Pressure, concentrations, temperature
What are the three stresses that cause changes?
System wants to decrease pressure. Shift to side with less gas molecules
What happens if pressure is increased?
right
If the following reaction increases pressure, what way does the equilibrium shift?

N2+3H2(g)<-->2NH3(g)
The equilibrium will shift toward the side with more moles of gas to reduce that stress
What happens if the pressure on a system at equilibrium is decreased?
The equilibrium concentrations, but it does not change the equilibrium constant Keq
When pressure is decreased on a system at equilibrium, what changes?
left
If the following reaction decreases pressure, how does the equilibrium shift?

N2(g)+3H2(g)<-->2NH3(g)
The equilibrium will shift in the direction that will reduce the concentration of that species
What happens if the concentration of one of the species in an equilibrium system is increased?
The system will shift to the right. Wants to decrease. Only way is to turn reactants into products.
What happens if the concentration of the reactants increases?
The equilibrium will shift in the direction that will increase the concentration of that species
What happens if the concentration of one of the species in an equilibrium system is decreased?
The system will shift to the right. Less products, less back reaction
What happens if the concentration of the products decreases?
exothermic
N2(g)+3H2(g)<-->2NH3(g)+heat
what type of reaction is this?
To the right; the equilibrium in the direction that produces heat
N2(g)+3H2(g)<-->2NH3(g)+heat

when cooling (taking heat away) shifts in what direction?
To the left; shifts the equilibrium in the direction that absorbs heat
N2(g)+3H2(g)<-->2NH3(g)+heat

When adding heat (increasing the temperature) shifts in what direction?
Equilibrium
State of reaction in which the rates of the forward and reverse reactions are the same.
Le Chatelier's principle
When a stress is applied to a system at equilibrium, the system will shift in the direction that offsets the stress.
Nothing
What happens to equilibrium with an addition of a catalyst?
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