Potential Energy Diagrams

The following video discusses potential energy diagrams for exotermic and endothermic reactions. Pick two of the following options that correctly pair exothermic and endothermic with their description.

• Endothermic - heat is absorbed

• Endothermic - heat is released

• Exothermic - heat is absorbed

• Exothermic - heat is released

The following video will guide you through exothermic and endothermic reactions and their potential energy diagrams.

Select the following that correctly pair endothermic and exothermic with their descriptions.

• Endothermic = heat is absorbed

• Endothermic = heat is released

• Exothermic = heat is absorbed

• Exothermic = heat is released

What letter represents the energy of the reactants for the forward reaction?

• A
• B
• C
• D

What is the potential energy of the reactants for the forward reaction?

• 40 kJ
• 20 kJ
• 80 kJ
• 60 kJ

What letter represents the change in enthalpy (ΔH) for the forward reaction?

• A
• B
• C
• D

What is the ΔH of the forward reaction?

Remember:  ΔH = PE_products - PE_reactants

• 40 kJ
• 20 kJ
• 80 kJ
• 60 kJ

What type of reaction is the forward reaction?

• Endothermic
• Exothermic

What is the energy of the activated complex?

• 75 kJ
• 225 kJ
• 300 kJ
• 225 kJ

What letter represents the activation energy for the forward reaction?

• A
• B
• C
• D

What is the activation energy of the FORWARD reaction?

Remember: Activation Energy (E_A) = PE_{activated complex} - PE_reactants

• 75 kJ
• 300 kJ
• 150 kJ
• 225 kJ