Chapter 15 Flashcards
(17 cards)
Define dynamic equilibrium
When the rate of the forward reaction is equal to the rate of the reverse reaction.
Note: Concentrations NOT necessarily equal; however, once equilibrium is reached, concentrations remain constant
If an equilibrium favors products, what does this say about reactant concentration?
Reactant concentration is low/most reactants have been consumed.
K>1
If an equilibrium favors reactants, what does this say about reactant concentration?
Reactant concentration is high/small amount of reactants have been consumed.
K<1
What is delta n?
= mol gaseous products - mol gaseous reactants
What if K > Q?
Reaction will proceed in forward direction
What if K < Q?
Reaction will proceed in reverse direction
What if Q = K?
Reaction is at equilibrium
What if Q = 0?
0
X
Mixture contains just reactants so reaction will proceed in forward direction.
What is Q = infinity?
X
0
Reaction contains only products so reaction will proceed in reverse direction
How will disturbing an equilibrium affect reactant/product concentrations and K?
- New Concentrations
- Same K (ONLY changes with temperature)
What if you add reactant to an equilibrium?
Forward reaction: Increases
Reverse reaction: No initial effect (depends on products)
K: No change
What if you remove reactant from an equilibrium?
Forward reaction: Decreases
Reverse reaction: No initial effect (depends on products)
K: No change
What happens to an equilibrium if you decrease volume?
Increases partial pressures of all gasses, therefore increases total pressure of system.
Shifts towards side with fewer moles of gas
What if K >> 1
Products are favored (forward reaction favored)
How is delta n calculated?
moles of gaseous products - moles gaseous reactants
When does Kp = Kc
When delta n is 0
K p = K c (RT)^delta n
What is the difference between Qc and Kc ?
Kc only applies at equilibrium.
Qc can be at any point during a reaction
