Energy Profile Diagrams

Question 1

What is an enthalpy profile diagram?

Answer 1

A diagram for a reaction to compare the enthalpy of reactants with the enthalpy of products.

Question 2

What is activation energy?

Answer 2

The minimum amount of energy required for a reaction to take place.

Question 3

Draw an energy profile diagram for an exothermic reaction.

Answer 3

• Enthalpy on y-axis.
• progress of reaction on x-axis
• enthalpy (reactants) > enthalpy (products)
• ae from reactants to peak
• enthalpy change from r to p (-ve)

Question 4

Draw an energy profile diagram for an endothermic reaction.

Answer 4

• Enthalpy on y-axis.
• progress of reaction on x-axis
• enthalpy (reactants) < enthalpy (products)
• ae from reactants to peak
• enthalpy change from r to p (+ve)