Chemical Equilibrium Flashcards
What is a reversible reaction
- Low activation energy
- does not go to completion
What is macroscopic properties
Colour
Pressure
Temperature
What is an equilibrium constant
Gives numerical value relating conc of all species at equilibrium
What does a large value of Kc apply?
That equilibrium favours products
What does a small value of Kc apply?
That equilibrium favours reactants
What is favoured if value of Kc is close to 1?
Neither products or reactants
Imposed changes that will effect equilibrium
Concentration
Total pressure
Temperature
What happens if the conc of a reactant has been increased
- Be an increase in rate of forward reaction - meaning there is an increase in rate of collisions between reacting particles
Why does the increase of conc of a reactant lead to a reduction in the conc of the reactant
As they are temporarily used up faster than they are produced
If there is an increase on volume that means there is
A decrease in pressure
If there is a decrease in volume that means there’s an
Increase in pressure
If a change in pressure is imposed on a closed system then the system can return to equilibrium by
Altering the total moles of the gas present
Increase in pressure inside system will favour
Side of reaction with few moles and it has less pressure in the system this PCIC (partially counteracting imposed change)
If decrease in pressure system will favour
Side of equilibrium reaction with greater moles as more pressure this PCIC
If both sides of a system with an imposed change have the same amount of miles on each side this means
Change in pressure has no effect on equilibrium position
If temp is increased then a new equilibrium is establish by
Favouring the exothermic process
Exothermic process if temp increased nee equilibrium is establisged as the -lcp temp change
System converts so of the added heat to chemical potential energy causing temp to decrease
If temp is decreased, new equilibrium is established by
Favouring the exothermic process
Exothermic process
System comverts chemical potential energy to heat therefore the temp rises
Exothermic reactions are more sensitive to
Temp than exothermic
Exothermic reaction Kc decreases as
Temp increases
Endothermic reaction Kc increase as
Temp increases
Other alterations
Catalyst
Speeds up rate of attainment of equilibrium
Increases rate of forward and reverse reaction
