Reversible Reactions Flashcards
The Rate and Extent of Chemical Changes (15 cards)
What happens to the concentrations of reactants as they react in a reversible reaction?
Their concentrations fall
What occurs as the concentrations of products increase in a reversible reaction?
The backward reaction will speed up
What is achieved when the forward and backward reactions occur at the same rate?
Equilibrium
What type of equilibrium is present when both reactions are still happening but there is no overall effect?
Dynamic equilibrium
What is required for equilibrium to be reached in a reversible reaction?
A closed system
When the equilibrium lies to the right, what does this indicate about the concentrations?
The concentration of products is greater than that of the reactants
When the equilibrium lies to the left, what does this indicate about the concentrations?
The concentration of reactants is greater than that of the products
What factors can affect the position of equilibrium?
- Temperature
- Pressure
- Concentration of reactants and products
What effect does heating a reaction typically have on equilibrium?
It can move the equilibrium to the right
What happens to the equilibrium when a reaction is cooled?
It can move the equilibrium to the left
In reversible reactions, if the reaction is endothermic in one direction, what is it in the other direction?
Exothermic
What is the relationship between the energy transferred in endothermic and exothermic reactions?
Energy transferred from surroundings in endothermic equals energy transferred to surroundings in exothermic
What happens to hydrated copper(II) sulfate crystals when heated?
They decompose to form anhydrous copper(II) sulfate
What is the result of adding water to anhydrous copper(II) sulfate powder?
It forms hydrated copper(II) sulfate again
Fill in the blank: Equilibrium is only reached if the reversible reaction takes place in a _______.
closed system
