Reactivity 1.2

Energy Cycles

Using Hess's Law and Bond Enthalpies to calculate energy changes indirectly.

Guiding Question: How does application of the law of conservation of energy help us to predict energy changes during reactions?

Standard Level (SL)

Calculating $\Delta H$ from bond breaking (Endo) and making (Exo).

The energy change is independent of the route taken.

Standard Enthalpy of Formation ( $\Delta H_f$ ) and Combustion ( $\Delta H_c$ ).

Using Hess's Law with Formation and Combustion data.

Calculating Lattice Enthalpy for ionic compounds.

Definitions of Enthalpy Terms.

Hess's Law puzzles and Born-Haber cycles.