Reversible reactions Flashcards
What does dynamic equilibrium mean?
The reactants and the products remain constant and the forward rate equals the reverse rate
What is Le Chatelier’s Principle?
If a reaction at equilibrium is subjected to change in concentration, pressure or temperature, the system will act to oppose the change
What happens when you increase the concentration of a reactant in equilibrium?
The equilibrium tries to get rid of the extra reactant by shifting the equilibrium to the right so more product is made
What happens when you increase the concentration of the product in equilibrium?
The equilibrium tries to get rid of the extra product by shifting the equilibrium to the left so more reactant is produced
When does changing pressure affect equilibria?
When the reactants and products are gases
What happens to the equilibrium when the pressure is increased?
The equilibrium shifts to the side with the fewer gas moles to reduce the pressure
What happens to the equilibrium when the pressure is decreased?
The equilibrium shifts to the side with more gas moles to increase the pressure again
What happens to the equilibrium when the temperature is increased?
The equilibrium will shift in the endothermic direction to absorb the extra heat
What happens to the equilibrium when the temperature is decreased?
The equilibrium will shift in the exothermic direction to release heat to replace it
What is the colour change when [Cu(H2O)6]+ reacts with HCl?
Light blue to yellowy-green
Why does the colour change to be more yellow-green when you increase the amount of HCl you add?
The reaction forms more [CuCl4]2- to get rid of the excess Cl-
What happens when you increase the temperature of the reaction when [Cu(H2O)6]+ reacts with HCl?
Equilibrium will move right
Forward reaction is endothermic
It will turn green
What happens when you decrease the temperature of the reaction when [Cu(H2O)6]+ reacts with HCl?
Equilibrium will move left
Reverse reaction is exothermic
It will turn blue
