Section+4b

= Energetics = back to IGCSE chemistry =In this section you will be assessed on= 4.10 understand that chemical reactions in which heat energy is given out are described as exothermic and those in which heat energy is taken in are endothermic 4.11 describe simple calorimetry experiments for reactions,such as combustion,displacement, dissolving and neutralisation in which heat energy changes can be calculated from measured temperature changes 4.13 understand the use of ΔH to represent molar enthalpy change for exothermic and endothermic reactions 4.14 represent exothermic and endothermic reactions on a simple energy level diagram 4.15 understand that the breaking of bonds is endothermic and that the making of bonds is exothermic = Section notes = = Book pages : = = Investigations = = Resources =
 * 4.12 calculate molar enthalpy change from heat energy change**
 * 4.16 use average bond energies to calculate the enthalpy change during a simple chemical reaction**
 * chapter 14: pages 120 to 124
 * chapter 25: pages 202 to 208

Animations
[|bbcbitesize animation of endo and eco reactions]