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Heat flow and the sign of ΔH\Delta HΔH

Heat flow and the sign of ΔH\Delta HΔH

Reaction profile diagrams comparing exothermic and endothermic reactions with reactant and product enthalpy levels and arrows showing negative and positive ΔH In energetics, the reaction is the system and everything else is the surroundings. Exothermic reactions transfer heat to the surroundings, while endothermic reactions absorb heat from the surroundings.

Enthalpy change Lesson

  1. A Level
  2. /Chemistry
  3. /Enthalpy change

Step-by-step lessons on AQA A Level Chemistry Enthalpy change. Each one builds up to exam-style questions. 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.

Lessons