Endothermic and Exothermic Reactions

• What are the two types of reactions discussed in the study material?

  Exothermic and Endothermic reactions
• What do reaction profiles indicate about a reaction?

  They show if a reaction is exothermic or endothermic
• What is activation energy?

  It is the energy needed to start a reaction
• What does the term "exothermic" mean in relation to heat?

  It refers to a reaction that gives out heat
• What does the term "endothermic" mean in relation to heat?

  It refers to a reaction that absorbs heat
• How can you determine if a reaction is exothermic or endothermic based on temperature change?

  • If the temperature increases, the reaction is exothermic.
  • If the temperature decreases, the reaction is endothermic.
• What should be included in a reaction profile sketch for an exothermic reaction?

  • Energy of the reactants
  • Energy of the products
  • Activation energy
  • A downward slope indicating energy release
• If the temperature of a reaction mixture increases from 21 °C to 28.5 °C, what type of reaction is it?

  Exothermic
• What is the relationship between "exo" and "thermic" in the context of exothermic reactions?

  • "Exo" means exit
  • "Thermic" means heat
  • Together, they indicate a reaction that releases heat
• What is the relationship between "endo" and "thermic" in the context of endothermic reactions?

  • "Endo" means within
  • "Thermic" means heat
  • Together, they indicate a reaction that absorbs heat