blew le chat today by not following the KISS rule!
for tomorrow.
inc P (or dec V) is like inc conc of gases, so there is an increase in collision frequency and therefore a greater forward and reverse reaction rate (due to the greater number of molecules available for collision per unit of volume = inc concentration); an inc in conc of all gases on the side with MORE molecules causes a disproportionately greater inc in reaction rate so there is a net shift toward the side with fewer molecules as the new equilibrium is reached.
dec P (or inc V) is akin to dec conc of gases so there is an decrease in collision frequency and therefore a decreased forward and reverse reaction rate due to the lower number of molecules available for collision per unit of volume = dec concentration); so, a dec in conc of all molecules on the side with more molecules causes a disproportionately greater decrease in reaction rate from those molecules; thus, there is a NET shift towards the side with more molecules as the new equilibrium is reached.
inc T speeds up both forward and reverse reaction rates because there is increased collision frequency and a greater fraction of effective collisions (due to the higher T = higher avg. KE of the molecules in the system) but there will be a disproportionately larger increase in the NET "energy consuming", endothermic, direction.
dec T slows down forward and reverse reaction rates because there is decreased collision frequency and a decreased fraction of effective collisions due to the lower T = lower avg. KE of the molecules in the system) but there is disproportionately greater decrease in the endothermic direction so that there is a net shift to the EXOTHERMIC direction.
