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 to react
• 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 is heat supplied in an endothermic reaction?

  By using a bunsen burner
• In an endothermic reaction profile, how do the products compare to the reactants?

  Products have more energy than reactants
• What is the difference labeled in an endothermic reaction profile?

  Energy absorbed
• What does activation energy represent in a reaction profile?

  The energy needed to start the reaction
• How does activation energy appear on a reaction profile?

  As the peak of the energy curve
• What happens to activation energy in reactions with higher energy requirements?

  The curves on the profile go higher
• How can specific chemicals be represented in a reaction profile?

  By labeling reactants and products directly
• What is the relationship between energy and reactions according to the video?

  Energy cannot be created or destroyed
• What is the common way energy is exchanged with surroundings?

  In the form of heat
• How would you measure heat energy released in a reaction?

  By measuring temperature increase
• What are the characteristics of exothermic reactions?

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

  • Absorb energy from surroundings
  • Require heat to proceed
  • Commonly involve decomposition
• What are the steps to draw a reaction profile?

  1. Label y-axis as total energy
  2. Label x-axis as reaction progress
  3. Place reactants on the left
  4. Place products on the right
  5. Indicate energy changes (released or absorbed)
  6. Show activation energy as a curve