a reaction that its products can react together to produce the original reactants
The reaction mixture of a reversible reaction may contain reactants and products and their proportions may be changed by altering the reaction conditions
hydrated copper sulfate <-> anhydrous copper sulfate + water
CuSO4．5H2O <-> CuSO4 + 5H2O
forward: endothermic
reverse: exothermic
When a reversible reaction happens in a closed system, it reaches a dynamic equilibrium
Dynamic equilibrium
->forward and reverse reactions happen at the same rate
->concentrations of the substances are constant
The equilibrium position of a reversible reaction is a measure of the concentrations of reacting substances at equilibrium
Le Chatelier’s Principle
If an equilibrium is disturbed by changing the conditions, the position of equilibrium moves to counteract the change
Factors that affect the reaction conditions
->pressure
->concentration
->temperature
If the concentration of the reactant is increased, the equilibrium position moves away from this reactant
