Core idea and standard conditions
Core idea and standard conditions
Enthalpy change is the heat energy change for a process at constant pressure. Standard enthalpy values are quoted for 100 kPa100\,\text{kPa}100kPa, usually 298 K298\,\text{K}298K, with each substance in its standard state.
Step-by-step lessons covering Eduqas A Level Chemistry Enthalpy changes for solids and solutions for A Level Chemistry. Each lesson works through exam-style questions in Component 1, Component 2 and Component 3 format. Build confidence with atomic structure, bonding and moles calculations early on, since these underpin the more demanding organic mechanisms, equilibrium and practical-analysis topics that dominate Year 2.