Explain enthalpy.

Distinguish between bond enthalpy and dissociation enthalpy.

Write the differences between ionisation enthalpy and electron gain enthalpy.

Name the element with highest ionization enthalpy.

Define and explain the enthalpy of atomisation (Delta_(a)H^(theta)).

Define and explain the enthalpy of combustion (Delta_(c)H^(theta)) .

Which is each pair of elements has a more electronegative gain enthalpy? Explain. (a) N or O

Which in each pair of elements has a more negative electron gain enthalpy? Explain.

Arrange the second period elements in the increasing order of their first ionization enthalpies. Explain why Be has higher IE_(1) then B.