Reversible reactions Flashcards
What do reversible reactions reach ?
Equilibrium
What happens as the reactants react ?
Their concentration fall so the forward reaction will slow down.
What happens once the reactants react and the forward reaction start to slow down?
After the reactants react and the forward reaction slows down, more and more products are made and their concentrations will rise, causing the backwards reaction to speed up.
What happens after the backwards reaction starts to speed up due to the concentration ride of the products ?
After a while the forward reaction will be going at the exactly same rate as the backwards one - the system is at equilibrium.
What happens at equilibrium?
At equilibrium, both reactions will still be happening, but there’s no overall effect. This means the concentrations of reactants and products have reached a balance and won’t change. It will look like the reaction has stopped.
What system is equilibrium reached in ?
Equilibrium is only reached if the reversible reaction takes place in a closed system.
What does a closed system mean ?
A closed system means that none of the reactants or products can escape and nothing else can get in.
True or false: When a reaction’s at equilibrium it doesn’t mean the amount of reactants and products are equal.
True
What does it mean when the equilibrium lies to the right ?
If the equilibrium lies to the right, the concentration of products is greater than that of the reactants.
What does it mean when the equilibrium lies to the left ?
If the equilibrium lies to the left, the concentration of reactants is greater that that of the products.
What does the position of equilibrium depend on ?
1) The temperature
2) The pressure
3) The concentration
How does the temperature affect the position of equilibrium?
Heating this reaction moves the equilibrium to the right ( adding ammonia and hydrogen) and coooling it moves it to the left (more ammonium )
True or false : reversible reaction are just endothermic
False - reversible reactions can be endothermic and exothermic
In a reversible reaction, if one of the reactions in endothermic in one direction, what does this mean for the other reaction ?
It will be exothermic in the other reaction.
The energy transferred from the surrounding by the endothermic is equal to what ?
It is equal to the energy transferred to the surroundings during the exothermic reaction.
