Chemical Energetics

6.1 Energetics of a reaction
Core
• Describe the meaning of exothermic and endothermic reactions
• Interpret energy level diagrams showing exothermic and endothermic reactions

Supplement
• Describe bond breaking as an endothermic process and bond forming as an exothermic
process
• Draw and label energy level diagrams for exothermic and endothermic reactions using data
provided
• Calculate the energy of a reaction using bond energies

6.2 Energy transfer
Core
• Describe the release of heat energy by burning fuels
• State the use of hydrogen as a fuel
• Describe radioactive isotopes, such as 235U, as a source of energy

Supplement
• Describe the use of hydrogen as a fuel reacting with oxygen to generate electricity in a fuel cell. (Details of the construction and operation of a fuel cell are not required.)