Equilbria
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What is homogenous equilibria
Reactants and products in same state
Le chataliers principle only works in
Homogenous equilibria
What is Kc
Equilibrium constant
Kc can be worked out from …
Molar concentration in a reaction
Kc =
Products ————- Reactants
The molar values in front of each species are the …
Powers in the Kc expression
Kc expression for 2A + B <~> 2C + D
Kc= [C]^2[D] ————- [A]^2[B]
[ ] means ..
Concentration of …
What acronym helps to work our conc of species before working out Kc
ICE I - initial moles C - change ij. Moles E - equilibrium moles
Moles of products at start of reaction
Always 0
What affects value of KC
Temperature Concentration Catalysts
If temp change equilibrium to shift right kc will _____
Increase
If temp change causes equilibrium to shift left Kc will _____
Decrease
Change in conc leads to kc beinf
Unaffected
Catalysts effect on kc
No effect on kc value Catalysts speeds up rate of forward and backward reaction so speeds up the rate at which equilibrium is established
catalyst effect on yield
. Catalyst has no effect on yield 3b. Adding a catalyst allows a lower temperature to be used 3c. So, this lowers the cost by speeding up rates of forward and backward equally