Flashcards in Energetics Deck (13):
chemical reactions where heat is given out
chemical reactions where heat is taken in
what is the enthalpy change?
the change in energy
what are the units for enthalpy?
if a reaction is exothermic, the enthalpy value is...
negative: the reaction is GIVING OUT energy
if a reaction is endothermic, the enthalpy value is...
positive: the reaction is TAKING IN energy
lower the activation energy
total energy absorbed to break bonds - total energy released in making bonds
enthalpy (using a calorimeter)=
4.2 x mass of solution x change in temperature (of the water)
energy change per mol=
-heat enthalpy/number of moles of fuel used