Exothermic and Endothermic reactions

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

  Exothermic and endothermic reactions
• What is the significance of activation energy in chemical reactions?

  It is the minimum amount of energy needed for reactant particles to collide and react
• How can exothermic and endothermic reactions be represented visually?

  • Using reaction profiles
  • Y-axis: total energy of molecules
  • X-axis: progress of the reaction
  • Exothermic: products lower than reactants
  • Endothermic: products higher than reactants
• In the reaction of methane and oxygen, what is the relationship between the energy of reactants and products?

  The products have less energy than the reactants
• What happens to energy during an exothermic reaction?

  Energy is released to the surroundings, usually in the form of heat
• What is the most common type of exothermic reaction?

  Combustion reactions
• What is an example of an endothermic reaction mentioned in the video?

  The breakdown of calcium carbonate into calcium oxide and carbon dioxide
• How does the reaction profile for an endothermic reaction differ from that of an exothermic reaction?

  In an endothermic reaction, the products are higher in energy than the reactants
• What does the activation energy represent on a reaction profile?

  The energy difference between the reactants' energy level and the highest point on the curve
• If a reaction has a higher activation energy, what does that imply about the reaction?

  More energy will be required to start the reaction
• How can you represent specific chemicals in a reaction profile?

  • Instead of just writing "reactants" and "products"
  • Write the actual chemical formulas from the equations
• What is the common way energy is exchanged with the surroundings during a reaction?

  In the form of heat
• What happens to temperature in a sealed container during an exothermic reaction?

  The temperature increases as heat energy is released
• How can you adjust the activation energy in a reaction profile?

  By making the curve higher for higher activation energies or lower for lower activation energies