3aEnergetics

Syllabus objectives

• 3.1know that chemical reactions in which heat energy is given out are described as exothermic, and those in which heat energy is taken in are described as endothermic
• 3.2describe simple calorimetry experiments for reactions such as combustion, displacement, dissolving and neutralisation
• 3.3calculate the heat energy change from a measured temperature change using the expression Q = mcΔT
• 3.4calculate the molar enthalpy change (ΔH) from the heat energy change, Q
• 3.5draw and explain energy level diagrams to represent exothermic and endothermic reactionsSeparate Chemistry only
• 3.6know that bond-breaking is an endothermic process and that bond-making is an exothermic processSeparate Chemistry only
• 3.7use bond energies to calculate the enthalpy change during a chemical reactionSeparate Chemistry only
• 3.8practical: investigate temperature changes accompanying some of the following types of change: • salts dissolving in water • neutralisation reactions • displacement reactions • combustion reactions.Practical