Unit 3 (ch 15,17) Flashcards
K»>1
favor product
K«<1
favor reactant
Does K have units?
no
K positive or negative?
positive
Kc=
[products]/[reactants]
Kp=
Pproducts/Preactants
Kc=Kp when
same number moles of gases
Kp=
Kc(RT)^delta n
K for the forward reaction = (blank) for the reverse
1/K
K overall =
K1xK2
If K is always at equilibrium, Q can be
any concentration
In non-equilibrium conditions find
Q
Q tells us
where we are relative to equilibrium and in which direction the reaction will proceed
Q
reaction to right/products/forward
If you go from a normal reaction to half the reaction, what process do you use?
K^1/2
Q=K
equilibrium
Q>K
reaction to left/reactants/reverse
Heterogeneous equilibrium
solid and liquid excluded
LeChatelier’s principle
stressed/preturbed reactions work to regain equilibrium
what is LC useful for?
drive reaction to form more products
Effect of pressure change
increase pressure favors side with fewer moles, decreasing favors side with more moles
increasing temp
help endo move forward and hinder exo
What do catalysts change?
time to reach equilibrium, not K
How can we determine how much K changes with T?
ln(K2/K1)= delta H/R(1/T2-1/T1)