Understand that chemical reactions involve a transfer of energy. Understand the difference between heat and temperature.
Recall the classification of reactions as endothermic or exothermic. Understand the temperature change (decrease or increase) that accompanies endothermic and exothermic reactions, respectively.
Sketch and interpret energy profiles for endothermic and exothermic reactions.
Understand the standard enthalpy change for a chemical reaction,H. Apply the equations q =mc andH= -q in the calculation of the enthalpy change of a reaction.
Cycles of energy
Recall that bond-breaking absorbs and bond-forming releases energy. Calculate the enthalpy change of a reaction from given average bond enthalpy data. Include explanation of why bond enthalpy data are average values and may differ from those measured experimentally.
Define Hesss law. Apply Hesss law to calculate enthalpy changes in multistep reactions.