This bundle of PowerPoints covers the SL content of R1: What drives chemical reactions? for IBDP Chemistry (first examination 2025), bringing together energy transfer, enthalpy changes, bond enthalpies, Hess’s law and fuels in one carefully structured resource. It is designed to help students understand why chemical reactions happen, how energy changes can be measured, and how these ideas connect to real-world fuel use and sustainability. In IBDP Chemistry, this topic explores the energetic fact