✅11 - Equilibrim II Flashcards
What is Kc?
The equilibrium constant
What is kc calculated from?
The ratio of product concentration to reactant concentration
What is Kc a constant for?
A given temperature.
this is becouse of equilibrium law which is based on ratio of products to reactants at a given temp.
What is a homogeneous equilibrium?
One where all the reactants and products are in the same state
What is a heterogeneous equilibrium?
One where the products and reactants aren’t all in the same state
Why are solids and pure liquids not included in Kc expressions?
Because their concentrations stay the same throughout the reaction
How would you calculate a value for Kc?
Put the concentrations into the expression and calculate using them
What can Kc be used to find?
Concentrations in an equilibrium mixture
What can Kc be calculated from?
Experimental data
What is the total pressure of a gas mixture equal to?
The sum of all the partial pressures of the gases
What can partial pressure be worked out from?
Mole fractions
What is a mole fraction?
The proportion of a gas mixture that is of a particular gas
How is the mole fraction calculated?
No. Of moles of gas/total no. Of moles of gas
How is partial pressure calculated?
Mole fraction of gas x total pressure
What is Kp?
An equilibrium constant that is used when dealing wth gases
How is Kp calculated?
From partial pressures of the gases
What can Kp be used to find?
Partial pressures
What does Kp for heterogeneous equilibrium include?
Only the gases
What happens to equilibrium if the conditions change?
The position of it moves
What factors affect equilibrium?
Concentration, pressure and temperature
If the temperature increases, where does equilibrium move to?
The endothermic side of the reaction
If pressure increases, where does equilibrium move to?
The side with fewer moles of gas
What does the size of the equilibrium constant tell you?
Where the equilibrium lies
The greater the Kc/Kp…
…the further to the right the equilibrium lies
The small the value of Kc/Kp…
…the further tot he left the equilibrium lies
What does the equilibrium constant for a reaction rely on?
The temperature of the reaction
What happens in a reaction if concentrations change?
The concentrations of other reactants/products change in order to keep Kc the same
How do concentration/pressure affect Kc/Kp?
The have no effect
How do catalysts affect the position of equilibrium?
They have no effect
Why do concentration and pressure not affect Kc/Kp?
Because although the amounts of products/reactants change, the ratio of reactants to products stays the same
