Chem 152 midterm 2

delta H

enthalpy

delta S

change in entropy

delta H is positive when

energy is brought into system ex. breaking bonds and is endothermic

delta H negative when

energy is used by system AKA exothermic

reaction is spontaneous when

delta G is negative delta G = delta H - T delta S

isothermic

constant temp

isochoric

constant volume

isobaric

constant pressure

standard reaction entropy equation

delta s = delta s products - delta s reactants

Ksp equation

M products / M reactants

endothermic

absorbs energy from surroundings OR positive delta H

exothermic

releases energy to surroundings OR negative delta H

entropy ____ when changing from solid, liquid, to gas

increases

entropy ____ when changing from gas, liquid, to solid

decreases

entropy ___ as temperature increases

increases

entropy _____ as temperature decreases

decreases

work > 0 when

environment is preforming work on system OR system volume increases

work < 0 when

system preforms work on environment OR system volume decreases

work = 0 when

no work is preformed on system or environment OR volume stays the same

standard reaction enthalpy equation

delta H = delta H products - delta H reactants

delta H formation equation

delta H1 + delta H2 + delta H3 …