Exothermic and Endothermic
Part of the Energy, Rates and Equilibrium section of Coddy's Chemistry journey. Lesson 1 of 35.
Exothermic: the chemicals give energy to the surroundings, which get warmer. Burning, hand warmers and neutralization are exothermic.
Endothermic: the chemicals take energy from the surroundings, which get colder. Cold packs, photosynthesis and heating limestone are endothermic.
Challenge
When calcium oxide is added to water in a self-heating can, the can gets hot enough to warm a drink. Is the reaction exothermic or endothermic?
Try it yourself
Energy diagramRead the energy diagram
Test yourselfThis lesson includes a short quiz. Start the lesson to answer it and track your progress.
All lessons in Energy, Rates and Equilibrium
1Energy in Reactions
Exothermic and EndothermicEnergy DiagramsEnthalpy ChangeActivation EnergyRecap - Hand Warmer