Equilibrium Law And Chemical Equilibrium Flashcards
What is a reverse reaction?
Starts with 100% P, decreases in G until point E
What is a dynamic equilibrium?
Reactions do not stop when equilibrium is reached. The forward and backward reactions continue to occur at the same rate
What does the equilibrium constant (K) describe?
The composition of a reaction mixture when it comes to equilibrium
What is thermodynamic activity?
Effective measured concentration or pressure of a component at a given moment
When is K used?
Heterogenous reaction (more than 1 phase)
What is the reaction quotient Q?
Measure of the composition of the reaction mixture as the reaction progresses NOT AT EQUILIBRIUM
If 🔺Gr<0, Q<K what happens?
The forwards reaction proceeds
If 🔺Gr>0, Q>K what happens?
The reverse reaction proceeds
If 🔺Gr=0, Q=K what happens?
The system is at equiu
When is equilibrium reached?
When Gibbs energy is at its minimum
If K>1 what is mainly present?
Products
Therefore negative 🔺G
If K<1 what is mainly present?
Mainly reactors
Therefore positive 🔺G
If K=1 what is mainly present?
Equal amounts of products and reactors
Therefore 🔺G is zero
What does it mean if 🔺Gr is more negative than -22.8kj/mol?
Completion
What does it mean if 🔺Gr is more positive than +22.8kj/mol?
Reaction does not occur
What is le chateliers principle?
When a change is made to a system in dynamic equilibrium the system responds to minimise the effect of the change.
What does increase in pressure do to an equilibrium?
Moves equilibrium to where there is less moles
What does increase in number of components do to an equilibrium?
Move to the other side
What does increase in temperature do to an exothermic reaction?
Favours left
What does decrease in temperature do to an exothermic reaction?
Favours right
What does increase in temperature do to an endothermic reaction?
Favours right
What does decrease in temperature do to an exothermic reaction?
Favours left
