Equilibria Flashcards
(21 cards)
Why is combustion irreversible
CO2 and H2O are stable and won’t react together to form methane and oxygen
What is the equation for the Haber process
What does this mean
A reversible reaction that can reach equilibrium
If you were to plot a forward reaction of a reaction with a double arrow onto a graph with concentration against time what would it look like
Explain why this is
At the start there are no products and a high amount of reactants
When reaction starts reactants are converted to products so reactants decrease and products increase
As this is happening the forward reaction is decreasing while the back wards reaction is increasing
This keeps going until the rate of the forward reaction and the backwards reaction happen at the same rate
Where on this graph has the reaction reached dynamic equilibrium
Where the concentration of the products and reactants are parallel
What is dynamic equilibrium
When the forward and reverse reactions are happening at the same rate
What happens to the concentration of the reactants and products when the reaction reaches dynamic equilibrium
They stop changing
Where does the equilibrium of this reaction lie towards
The left of the reaction because there are more reactants than products
Where does the equilibrium of this reaction lie towards
The right of the reaction because there are more products than reactants
What is Le Chatelier’s principle
What happens if you increase the concentration of A
Because of that the rate of the forwards reaction is greater than the reverse
This means more C and D are produced and A and B has their concentrations reduced
What is gas pressure proportional to
The number of moles of gas present
What would happen to the equilibrium if you increase the pressure of this reaction
More moles of reactants than products
Equilibrium will shift to the right to reduce the pressure
What will happen if you increase the pressure of this reaction
More moles of products than reactants
The equilibrium will shift to the left
What sort of reaction is the forward and backwards reactions
What will happen to the temperature of the system if the forward reaction increases
Forward is exothermic
If forward increases then temperature of the system increases
What will happen to this reaction if the temperature increases
If temperature increases the equilibrium will shift towards the left to decrease the temperature
This is because the reverse reaction is endothermic and will take in energy and the temperature will decrease
What will happen to this reaction if the temperature decreases
Equilibrium will shift to the right because the forwards reaction is exothermic
Energy will be released and the temperature will increase
What is the backwards and forwards reaction
Describe and explain the effect on catalyst to a reaction at equilbrium
They have no effect because they increase the forwards and backwards reactions by the same amount
What is Kc for this reaction
