6.5 Introduction to Enthalpy of Reaction

• What is the enthalpy of reaction defined as?

  Change in heat energy
• What is the enthalpy relationship in an exothermic reaction?

  H(products) < H(reactants)
• What is the enthalpy change relationship in an endothermic reaction?

  H(products) > H(reactants)
• How does increasing pressure affect an exothermic reaction?

  Favors exothermic reaction
• An endothermic reaction has a positive ΔH.


  True
• In an endothermic reaction, heat is absorbed from the surroundings, and ΔH is positive.


  True
• Vaporization is typically an endothermic process.


  True
• Exothermic reactions are often favored for industrial processes because they provide the necessary heat.


  True
• In an exothermic reaction, heat energy is released
• The sign of ΔH indicates whether a reaction is exothermic or endothermic
• Reactions that form stronger bonds in the products tend to be exothermic
• Exothermic reactions like combustion are used to generate electricity