Exothermic and endothermic

• What is meant by an exothermic reaction?

  An exothermic reaction transfers energy from the reacting molecules to the surroundings.
• How does an exothermic reaction affect the temperature of the surroundings?

  The temperature of the surroundings increases, making them hotter.
• What is a common example of an exothermic reaction?

  Combustion, such as wood burning.
• What are other examples of exothermic reactions besides combustion?

  Certain oxidation reactions and neutralization reactions.
• What is an energy profile diagram?

  • A representation of energy changes in a reaction.
  • Shows the energy of reactants and products.
  • Indicates energy released or absorbed during the reaction.
• In an exothermic energy profile, what can be said about the energy of the products compared to the reactants?

  The products have less energy than the reactants.
• What does the difference in energy between reactants and products in an exothermic reaction indicate?

  It indicates the amount of energy released to the surroundings.
• What are two practical applications of exothermic reactions?

  Hand-warmers and self-heating cans.
• What is meant by an endothermic reaction?

  An endothermic reaction takes in energy from its surroundings.
• How does an endothermic reaction affect the temperature of the surroundings?

  The temperature of the surroundings decreases, making them colder.
• What is a good example of an endothermic reaction?

  Thermal decomposition.
• In an endothermic energy profile, what can be said about the energy of the products compared to the reactants?

  The products have more energy than the reactants.
• What does the difference in energy between reactants and products in an endothermic reaction indicate?

  It indicates the amount of energy taken in by the reaction.
• What is the activation energy in a chemical reaction?

  • The minimum amount of energy required for particles to collide and react.
  • Represented as the energy from the reactants to the peak of the energy profile.
• How is activation energy represented on an energy profile diagram?

  It is shown as the energy from the reactants to the peak of the curve.
• What is a key requirement for reactions to occur?

  Particles must collide with each other with sufficient energy.
• What happens to the energy of particles during a reaction?

  Particles must have a minimum amount of energy to react, known as activation energy.
• What can you find in the revision workbook mentioned in the video?

  • Questions on exothermic and endothermic reactions.
  • Questions on reaction energy profiles.