Topic 10 Equilibrium Flashcards
What is necessary for a reversible reaction to form a dynamic equilibrium
A closed system
What is Le Chatelier’s principle
If a reaction at equilibrium is subjected to a change in pressure, temperature or concentration then the position of equilibrium will shift to counteract the change
How does equilibrium shift if conc of products increase
POE will shift Left
What effect does a catalyst have on POE
No effect - speed up forward and backwards reaction equally
What will catalyst effect in a reversible reaction
Time to reach equilibrium
What is Kc formula for this equation
2A + B <—> 2C + D
Kc = [C]^2[B]/[A]^2[B]
What do square brackets represent
Concentration
What states are not included in Kc equations
Solids and pure liquids
Why aren’t solids and pure liquids in Kc equations
Their concentration is constant (only decrease in moles occurs)
What is the only thing to affect Kc
Temperature
What is the acrostic for working out concentrations at equilibrium
ICE
Initial, change, equilibrium
What is total pressure
Sum of all the pressures of individual gases
What is partial pressure
Pressure exerted by an individual gas in a system
What is a mole fraction
The fraction of moles of a specific gas in a gas mixture
Formula for mole fraction
Number of moles of a gas/ total moles of gas in the mixture
