Exothermic & Endothermic Reactions

• What are the two types of reactions discussed in the video?

  Exothermic and endothermic reactions
• What do exothermic reactions do with energy?

  They transfer energy to the surroundings
• What is the significance of activation energy?

  It is the minimum energy needed for reactions
• How can we represent exothermic and endothermic reactions using reaction profiles?

  • Exothermic: Products lower than reactants
  • Endothermic: Products higher than reactants
  • Y-axis: Total energy
  • X-axis: Progress of the reaction
• What is the most common type of exothermic reaction?

  Combustion reactions
• What happens to energy in an exothermic reaction?

  Energy is released to the surroundings
• How would you represent the reaction of methane and oxygen in a reaction profile?

  Reactants on the left, products lower
• What is the energy change in an endothermic reaction?

  Energy is absorbed from the surroundings
• What is required to break down calcium carbonate in an endothermic reaction?

  Heat energy
• How does activation energy differ in exothermic and endothermic reactions?

  • Exothermic: Energy is released overall
  • Endothermic: Energy is absorbed overall
  • Activation energy is still needed to start both reactions
• How is activation energy represented in reaction profiles?

  As the peak of the energy curve
• If you wanted to show a reaction with higher activation energy, what would you do to the curve?

  Make the curve go higher
• How would you label reactants and products in a specific reaction profile?

  Use the actual chemicals from the equations
• What is the relationship between energy and chemical bonds in reactions?

  • Different chemicals store different energy amounts
  • Total energy of reactants vs. products is crucial
  • Energy cannot be created or destroyed, only transferred