Kc Flashcards
What is Le Chateliers principle?
If a system is at equilibrium and a change is made to any of the conditions, then the system responds to counteract the change.
What would happen at equilibrium if the concentration of a reactant is increased?
If the concentration of a reactant is increased, more products will be formed until equilibrium is reached again. Equilibrium moves to the right.
What would happen at equilibrium if the concentration of a reactant is decreased?
If the concentration of a product is decreased, more reactants will react until equilibrium is reached again. Equilibrium moves to the left.
What would happen at equilibrium if the temperature of a system at equilibrium is increased for an endothermic reaction?
The relative amount of products at equilibrium increases for an endothermic reaction. Equilibrium move to the right.
What would happen at equilibrium if the temperature of a system at equilibrium is increased for an exothermic reaction?
The relative amount of products at equilibrium decreases for an exothermic reaction. Equilibrium move to the left.
What would happen at equilibrium if the temperature of a system at equilibrium is decreased for an endothermic reaction?
The relative amount of products at equilibrium decreases for an endothermic reaction. Equilibrium moves to the right.
What would happen at equilibrium if the temperature of a system at equilibrium is decreased for an exothermic reaction?
The relative amount of products at equilibrium increases for an exothermic reaction. Equilibrium moves to the left..
For gaseous reactions at equilibrium what happens if you increase pressure?
An increase in pressure causes the equilibrium position to shift towards the side with the smaller number of molecules as shown by the balanced symbol equation for that reaction
For gaseous reactions at equilibrium what happens if you decrease pressure?
A decrease in pressure causes the equilibrium position to shift towards the side with the larger number of molecules as shown by the balanced symbol equation for that reaction.
What effect does a catalyst have on the position of equilibrium?
A catalyst speeds up the rate of the forward and backwards reaction equally.It doesn’t affect the position.
What is Kc?
Kc represents the equilibrium constant for concentrations
What can Kc be calculated for?
It can be calculated for reactions in solution or homogeneous gas reactions as the concentration for both can be calculated as the number of moles in a certain volume.
When is Kc constant?
It is constant at constant temperature.
How does Kc change in a reversible reaction?
Equilibrium constant for the reverse reaction is the reciprocal of the value for the forward reaction (1/Kc)
What effect does changes in pressure and volume have on Kc?
It has no effect on Kc.
