| Term | Definition |
| Closed system | neither matter nor energy can be lost or gained from the system, macroscopic poperties remain constant |
| The equilibrium constant | the concentration of products divided by the concentration of reactants |
| the magnitude of the equilibrium constant | the magnitude is related to the position of equilirium |
| Le Chatelier's Principle | if a system at equilibrium is subjected to a small change the equilibrium tends to shift to minimize the effect of the change |
| homogeneous reaction | reactants and products are the same phase |
| change in concentration | the equilibrium shifts to the opposite side |
| Change in pressure | increasing the pressure will shift the equilibrium to the side with less volume |
| Change in temperature (exothermic) | if heat is taken away forward reaction is increased |
| change in temperature (endothermic) | if heat is taken away the equilibrium will shift to the left |
| adding a catalyst | will increase the rate at which the quilibrium is reached, but has no value on the equilibrium position |