| A | B | 
| collision theory | IF they have enough energy, particles can form chemical bonds by colliding | 
| activation energy | minimum energy particles must have in order to react | 
| activated complex | arrangement of atoms at the peak of the energy barrier | 
| transition state | another name for activation complex | 
| catalyst | a substance that increases the rate of a reaction | 
| inhibitor | a substance that interferes with a catalyst | 
| reversible reaction | simultaneous reaction in both directions | 
| chemical equilibrium | forward and reverse rxns take place at same rate | 
| forward reaction | reaction moves to right/toward products | 
| reverse reaction | reaction moves to left/toward reactions | 
| LeChatelier's Principle | stress applied to a system causes the system to change in ways that relieve the stress | 
| Free energy | energy that is available to do work | 
| spontaneous reactions | naturally favor the formation of products | 
| non-spontaneous reactions | do not favor the formation of products | 
| entropy | chaos/the disorder of a system | 
| law of disorder | things tend toward maximum chaos/disorder | 
| exergonic | releases free energy: a spontaneous reaction | 
| endergonic | absorb energy: non-spontaneous reactions |