This is a comprehensive lesson that provides an introduction to enthalpy changes and serves as the first lesson in a scheme of work on energetics for Senior High School Chemistry. The lesson starts with a recap of GCSE chemistry then moves on to defining enthalpy changes. Students learn the definitions of each type of enthalpy change for homework due in the following lesson. Students then consider energy level diagrams for the grade C task. For the grade B task students predict enthalpy changes using bond dissociation data. There is a worked example of this using the Haber process. The grade A task involves converting enthalpy change values into Joules per gram values that might be used in calorimetry. Scaffolded resources and a markscheme are provided. Please rate this resource and leave feedback.

This is a thoroughly planned A level lesson writing an expression for the equilibrium constant Kc. The 2016 specification DOES NOT include Kp - partial pressures and thus students must ALWAYS write their expressions using SQUARE brackets (Kp uses curved brackets). The lesson starts with a recap of equilibrium then moves on to heterogeneous and homogeneous reaction systems. The lesson then moves to students writing expressions for Kc for a variety of reactions. Note that solids are left out of the expression for Kc as their concentration hardly changes during at equilibrium (they occupy a small volume). Answers are provided. Please rate this resource and leave feedback.