Equilibrium Flashcards
What is a reversible reaction
Where some chemical reactions go forwards and backwards depending on the conditions
What are the features of dynamic equilibrium
The rate of forwards reaction is the same as the rate of the reverse reaction
The concentration of reactants and products doesnt change
Occurs only in a closed system
What is a closed system
In a closed system matter cannot be exchanged with surroundings
On graphs where does it show where dynamic equilibrium is reached
Where they level out
If A is higher than C on a graph what happens
The concentration of A is higher than C at equilibrium so it lies to the left hand side
Because the concentration doesnt change it looks like the reaction has stopped. Why is this incorrect?
Because equilibrium is dynamic. Both reactions still occur but because they have the same rate there is no overall change in the concentration of reactants or products
The reaction between nitrogen and oxygen in a car engine does not reach dynamic equilibrium. Suggest why not
It does not occur in a closed system
What is Le Chateliers principle
When a system in dynamic equilibrium is subjected to a change the position of equilibrium will shift to minimize the change
What are the 3 things that affect the position of equilibrium
Pressure
Concentration
Temperature
What is an example of a reversible reaction
A+B —–> C+D
<——
What happens if you increase the concentration of A
The equilibrium will move to the right to mimimise the change
What happens if D was removed
The equilibrium shifts right to make more D nad oppose the decrease
What does changing pressure only apply to
Only applies to reactions involving gases
What is an example of a pressure reversible reaction
A+ 2B —-> C+ D
<—–
What happens if the pressure increases
It will shift to the side with the least number of moles to minimize the change
