Summary - Unit 10 - Equilibrium I (9CH0)

Reversible reactions: Eqm constant - Kc
- Can change position of eqm = tells us position of eqm using ratio of prod:react, showing
- Eqm = forwards & backwards reaction happens at yield (prod) at eqm
the same rate, conc of react and prod remains the Big Kc = eqm lies on the RHS ∴ more products
same
- Dynamic eqm = closed system + eqm above
- Catalyst dont change position of eqm, they only ↑
products
rate
Le chatelier's principle: reactants
= for a closed system at eqm, is a change is made the
position of eqm will shift in a direction to oppose the change
Eqm in industry
- Eqm on right = more products - good in industry
- Eqm on left = more reactants - bad in industry
Changing the position of the eqm:
(homogeneous system in eqm) Calculating Kc
Temperature 1. Determine whether its a homo/heterogeneous system
- ↑ temp - eqm will move in the endo direction (endo - Homo = all components in same state
- Hetero = 2+ in different states
product) to take in excess heat
- ↓ temp - eqm will move in exo direction (exo products) DON'T INCLUDE PURE SOLIDS IN Kc EQ
to release heat 1. Units of Kc:
Concentration A+B→C+D Use same powers at Kc equation
- ↑ conc A - eqm shift to RHS to restore conc of A
- ↓ conc A - eqm shift to LHS to restore conc of A
Pressure
(only gases, ignore non-gases)
- ↑ pressure - eqm shifts to side w less gas particles
- ↓ pressure - eqm shifts to side w more gas particles
Catalyst
- Will ↓ Ea for both forward and backwards reactions
- ∴ won't affect position of eqm