In
a chemical reaction
DH = H products – H reactants
If DH >0,
then qp >0
The reaction is Endothermic.
Heat goes from the surroundings into the
system.
If DH <0,
then qp <0
The reaction is Exothermic.
Heat goes from the
system into the surroundings.
An example of an
exothermic reaction:
An example from
the S&T mining dept: