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 in reactions?

  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 change?

  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
• How does the energy of products in an endothermic reaction compare to reactants?

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

  Heat is supplied from the surroundings
• What does the activation energy represent on a reaction profile?

  The minimum energy needed for reactants to react
• How does activation energy affect the start of a reaction?

  Higher activation energy requires more energy to start
• How can activation energy be represented on a reaction profile?

  As the energy difference from reactants to peak
• How would you show a reaction with higher activation energy on a profile?

  Make the curve go higher
• How would you show a reaction with lower activation energy on a profile?

  Make the curve go lower
• What can be labeled on a reaction profile instead of just reactants and products?

  The specific chemicals from the equations
• What is the significance of measuring temperature in exothermic reactions?

  It indicates heat energy released
• How does energy transfer occur in chemical reactions?

  Energy is transferred, not created or destroyed
• What is the common way energy is exchanged with surroundings?

  In the form of heat