unit 6 Flashcards
tskes enrgy to
break bonds, positive enthalphy
frees energy to
form bonds negative enthalpy
which takes more energy liquid to gas or gas to liquid
liquid to gas becuase the bonds between atoms are complétely broken
enthalpy or H is what units
J/mol
make sure once tou find heat releaeed you divide it by the moles in the equation
determine the amount of energy released or gained
find just the numebr of joules or kilojoules
bond enthalpy
reactants minus products
enthalpy of formation
producta minus reactants
to find enthakoy of reaction do what
q rxn/ n
when energy is released in an exotehrmid reaction…?
what haoones to the temp of the reaction mixture
the temperature of the reaction mixture increases
if C6H6 is burned in air whats the chem rxn
C6H6 + O2 -> CO2 + H2O
when you balance reactiona and auve to multiply to get rid of frcations what halpens to the enthalpy
you have to multiplu the enthalpy also
rmeoving heat enregy is endo or exo thermic
exo
gas to liuqid to solid (endo or wxo)
exo
determine the enthalpy H by using mols of H2O menas what
to total joules absorbed or released in rxn over mols in problem
then convert to joules/moles using the balance dequation
change in enthalpy
products minus reactabts
