Heat of fusion (∆Hfus)
The ∆H for the conversion of a solid to a liquid.
Heat of sublimation (∆Hsub)
The ∆H for the conversion of a solid directly to a gas.
Heat of vaporization (∆Hvap)
The ∆H for the conversion of a liquid to a vapor.
Heisenberg uncertainty principle
The principle that states that it is impossible to simultaneously determine with perfect accuracy
both the momentum and position of a particle.
Henry’s law
The law stating that the mass of a gas that dissolves in a solution is directly proportional to the
partial pressure of the gas above the solution.
Hess’s law
The law stating that the energy change in an overall reaction is equal to the sum of the energy
changes in the individual reactions that comprise it.
Heterogeneous
Nonuniform in composition.
Homogeneous
Uniform in composition.
Hund’s rule