Exothermic and Endothermic

• 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, usually as heat
• How can we represent exothermic and endothermic reactions?

  Using reaction profiles
• In a reaction profile, where are the reactants and products placed for an exothermic reaction?

  Reactants on the left and products on the right
• What happens to the energy of products in an exothermic reaction compared to the reactants?

  The products have less energy than the reactants
• What is the significance of activation energy in a reaction?

  It is the minimum energy needed for reactant particles to collide and react
• What is the most common type of exothermic reaction?

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

  Breaking down calcium carbonate into calcium oxide and carbon dioxide
• How do we represent the energy absorbed in an endothermic reaction on a reaction profile?

  The products are placed higher than the reactants
• How does the activation energy differ between exothermic and endothermic reactions?

  Both types of reactions require activation energy to start
• What happens to the temperature in an exothermic reaction when measured in a sealed container?

  The temperature increases as heat energy is released
• What are the key features of reaction profiles for exothermic and endothermic reactions?

  • Exothermic:
  • Reactants lower than products
  • Energy released to surroundings
  • Endothermic:
  • Products higher than reactants
  • Energy absorbed from surroundings
• What is the relationship between energy and chemical bonds in different chemicals?

  Different chemicals store different amounts of energy in their bonds
• How can we show activation energy on a reaction profile?

  By drawing a curve from the reactants to the products
• What happens to the activation energy if we want to show reactions with higher activation energies on a profile?

  The curves would be drawn higher up
• How would you represent a reaction profile for a specific reaction?

  By labeling the lines with the actual chemicals from the equations
• What is the importance of activation energy in chemical reactions?

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