Exothermic and Endothermic Reactions

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

  Exothermic and endothermic reactions
• How can exothermic and endothermic reactions be represented?

  Using reaction profiles
• What is the importance of activation energy?

  It is the minimum energy needed for reactions
• What do different chemicals store in their bonds?

  Different amounts of energy
• In the reaction of methane and oxygen, what is compared to determine energy changes?

  The total energy of reactants and products
• In the methane and oxygen reaction, how does the energy of products compare to reactants?

  Products have less energy than reactants
• What does a reaction profile's y-axis represent?

  Total energy of the molecules
• What does a reaction profile's x-axis represent?

  Progress of the reaction
• What happens to energy in an exothermic reaction?

  Energy is released to the surroundings
• What is the most common type of exothermic reaction?

  Combustion reactions
• What is an example of an endothermic reaction?

  Breaking down calcium carbonate
• How do the products of an endothermic reaction compare to the reactants in terms of energy?

  Products have more energy than reactants
• What is the role of heat in an endothermic reaction?

  Heat is supplied to the reaction
• How is activation energy represented on a reaction profile?

  As the energy difference to the peak
• What happens to activation energy if the energy levels are increased in a reaction profile?

  Activation energy increases
• What can be labeled on a reaction profile instead of just reactants and products?

  The specific chemicals from the equations
• What are the characteristics of exothermic reactions?

  • Release energy to surroundings
  • Commonly involve combustion
  • Heat energy is a primary form of energy released
• What are the characteristics of endothermic reactions?

  • Absorb energy from surroundings
  • Require heat to proceed
  • Products have higher energy than reactants
• What is the significance of activation energy in chemical reactions?

  • Minimum energy needed for reactants to collide
  • Determines the rate of reaction
  • Essential for both exothermic and endothermic reactions