Dynamic Equilibrium Flashcards
What are reversible reactions?
Reactions that go both ways at once.
What are the half equations for the forwards and backwards reactions of H2(g) + I2 (g) 2HI (g)
What happens to the reactants and products in a reversible reaction?
What does this result in?
As the reactants get used up, the forwards reaction slows down - and as more product is formed, the reverse reaction speeds up.
After a while the forwards reaction will be going at exactly the same rate as the backwards reaction, so the amounts of reactants and products won’t be changing anymore - it seems like nothing’s happening.
This is called dynamic equilibrium.
What do need about dynamic equilibrium?
At equilibrium the concerntrations of reactants and products stay constant.
A dynamic eqilibrium is a closed system - nothing can get in or out.
What happens if you change the conditions while a reversible reaction is taking place?
What are these conditions?
If you change the concerntration, pressure or temperature of a reversible reaction you tend to alter the position of equilibrium.
This means you end up with different amounts of reactants and products at equilibrium.
e.g.
What can be used to predict what will happen when conditions are changed in a reversible reaction?
Le Chatelier’s principle
What can be used to predict what will happen when conditions are changed in a reversible reaction?
Le Chatelier’s principle
What is Le Chatelier’s principle?
If there’s a change in concerntration, pressure or temperature, the equilibrium will moveto counteract the change.
Describe how the position of the equilibrium will change when ther is a change in temperature, pressure or concerntration.
What are the 3 rules involving concerntration in Le Chateliers principle?
What are the 3 rules invoved in temperature in Le Chateliers principle?
What are the 2 rules involved pressure in Le Chatelier’s principle?
What do you need to remeber about atalysts in terms of eqilibrium?
Give an example of the real life application of Le Chatelier’s principle?
How are the conditions used to make ethene a compromise?
