Chemistry definitions:1. Enthalpy change is the heat energy
change measured at a constant pressure.2. Standard enthalpy change
of formation of a compound is the enthalpy change when 1 mole of
the compound is formed from its elements under standard conditions
(298K and 100kpa), all reactants and products being in their
standard states. Symbol Hf 3. The standard enthalpy of combustion
of a substance is defined as the enthalpy change that occurs when
one mole of a substance is combusted completely in oxygen under
standard conditions. (298K and 100kPa), all reactants and products
being in their standard states.Symbol Hc 4. The enthalpy of
neutralization (Hn) is the change in enthalpy that occurs when one
equivalent of an acid and one equivalent of a base undergo a
neutralization reaction to form water and a salt. It is a special
case of the enthalpy of reaction. It is defined as the energy
released with the formation of 1 mole of water.5. The Mean bond
energy the average value of the bond dissociation enthalpy for a
given type of bond taken from a range of different compounds6. Bond
dissociation energy, the enthalpy change required to break a
covalent bond with all species in the gaseous state7. Calorimetry
is a way to measure the energy change of a reaction or the energy
contained in matter. One important use for calorimetry is to
measure the number of calories stored in food for nutritional
information.
