Energy Diagrams

Part of the Energy, Rates and Equilibrium section of Coddy's Chemistry journey. Lesson 2 of 35.

An energy diagram shows the chemicals' energy from reactants (left) to products (right).

Exothermic: the products end lower than the reactants.

Exothermic: the products are lower than the reactants

Endothermic: the products end higher than the reactants.

Endothermic: the products are higher than the reactants

Challenge

Hydrogen burns in oxygen. In the units of this diagram, the reaction gives out $240\ \mathrm{kJ}$ and its hump stands $80\ \mathrm{kJ}$ above the reactants. Say what kind of reaction it is and draw its levels.

Try it yourself

Energy diagramDraw the energy diagram

Test yourself

This 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 Change Activation Energy Recap - Hand Warmer

4Rates of Reaction

Collision Theory Concentration and Rate Temperature and Rate Surface Area Catalysts Recap - Speed Trials

7Practice Problems

Recap - Methanol Plant Recap - Butane Lighter Recap - Limestone Kiln

2Bond Energies

Breaking and Making Bonds Delta H from Bond Energies Hess's Law Energy and Moles Recap - Fuel Value

5Equilibrium

Reversible Reactions Dynamic Equilibrium The Equilibrium Constant Writing K Solids and Liquids in K Recap - K Builder

3Changes of State

Heating Curves Melting and Boiling Energy of State Changes Recap - Ice to Steam

6Changing an Equilibrium

Le Chatelier's Principle Changing Concentration Changing Pressure Changing Temperature The Haber Process Recap - Factory Settings