Hess Cycles

This video looks at Hess’ Law, thermochemical cycles and calculations for these. Definitions of standard enthalpy of formation and combustion are discussed. Specifically refers to AQA but suitable for all A Level boards.

00:26 Energetics definitions
04:03 Enthalpy of formation of elements
06:09 Hess’s Law
11:27 Thermochemical cycles
23:12 Activity 1 – constructing Hess cycles
25:39 Activity 1 answers
29:17 Introduction to Hess cycle calculations
34:06 Example 1 – using combustion data
43:15 Example 2 – using formation data
50:54 Activity 2 – Hess cycle calculations
51:44 Activity 2 answers