of heat absorbed or released during a chemical or physical process.
-thermochemistry- the study of heat changes that accompany
chemical reactions and phase changes
-system- the specific part of the universe that contains the reaction
or process you wich to study.
-surroundings- everyhting in the universe other than the system
-universe- the system plus hte surroundings
-enthalpy- (H) the heat content of a system at a constant pressure
-enthalpy (heat) of reaction- the change in enthalpy for a
reaction- the difference between the enthalpy of the substance
that exist at the end of the reaction and the enhalpy of the
substances present at the start