ap chem unit 5

nature tends towards

stability

spontaneus

reactants are at a higher energy than products; nature tends towards stability; it goes to products without any external energy

non-spontaneous

products are at a higher energy than reactants; external energy is required

thermodynamically stable

a reaction which has an overall positive energy change (non-spontaneous, endothermic)

exothermic

\-∆H, spontaneous, unstable (before)

endothermic

\+∆H, non-spontaneous, stable (before)

kinetically stable

a reaction that proceeds so slowly that no change is detectable

stoichimetric reactions

go to completion, more are not stoichimetric, more are reversable (A + B ⇌ B + A)

dynamic equlibrium

when the rate at which the products are being formed is equal to the rate at which the products decompose