Reaction Rates & Equilibrium

Reaction Rate Fundementals

• Reactions don't always have the same rates
• Reactions occur when molecules collide
• A reaction breaks apart old bonds and make new ones. 
• Are measured by how quickly a reactant disappears or the product appers 

Collision Factors

• concentration
• temperature
• energy

Energy & catalysts

• The right amount of energy is needed to complete a reaction 
• Catalysts sometimes help speed up the reaction process
• Catalysts are never part of the reaction

equilibrium

• Equilibrium: when two unbalanced sides become balanced
• So when some reactants aren't used up they move to 
• a different side depending on what state they are in

Le Châtelier's Principle

• If a stress is applied to a system in dynamic equilibrium, 
• the system changes to relieve the stress
• RULES
• Concentration - increasing concentration shifts the equilibrium to 
• the left and vice versa

LE CHÂTELIER'S PRINCIPLE (continued)

• temperature - increasing temperature shifts the equilibrium to
• the left and vice versa
• Pressure - only affects gases, an increase in pressure will cause
• the equilibrium to shift to the side with fewer moles