exo and endothermic reactions

• What is meant by an exothermic reaction?

  It transfers energy to the surroundings
• What happens to the temperature of surroundings during an exothermic reaction?

  The temperature increases
• How do scientists represent energy changes in reactions?

  By drawing energy profile diagrams
• What does an energy profile diagram for an exothermic reaction show about the products and reactants?

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

  The energy released to the surroundings
• What are two uses of exothermic reactions?

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

  It takes in energy from the surroundings
• What happens to the temperature of surroundings during an endothermic reaction?

  The temperature decreases
• What does the energy profile for an endothermic reaction show about the products and reactants?

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

  The energy taken in from the surroundings
• What is the activation energy in a reaction?

  The minimum energy needed for particles to react
• How can activation energy be represented on an energy profile diagram?

  From reactants to the peak of the curve
• What are the key features of energy profiles for exothermic and endothermic reactions?

  • Exothermic: Products have less energy than reactants
  • Endothermic: Products have more energy than reactants
  • Both have a peak representing activation energy
• What are the main types of reactions discussed in the video?

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

  • Determines if a reaction can occur
  • Requires sufficient energy for particle collisions
• what are some examples of exothermic reactions

  1. combustion
  2. neutralisation
• what are some examples of endothermic reactions

  1. therm, decomposition
  2. reaction of citric acid and sodium hydrogencarbonate
• why do sports injury treatments require and endothermic reaction

  to take heat away preventing swelling
• what do neutralisation reactions do in terms of energy transfer

  gives out energy (exothermic)
• what do displacement reactions do in terms of energy transfer

  can either take in or give out energy
• what do combustion reactions do in terms of energy

  give out energy (exothermic)