Energy Changes

• What is an Exothermic reaction?

  transfers energy to the surroundings, causes a rise in temperature
• What is an example of an exothermic reaction?

  Combustion

  Neutralisation

  Oxidation reactions
• What are Every day uses of Exothermic reactions?

  Hand warmer and self heating cans
• What’s an endothermic reaction?

  energy is taken in from surroundings, a fall in temperature
• What is an example of an endothermic reaction?

  Thermal decomposition

  Citric acid and sodium hydrocarbonate
• What are every day uses of endothermic reactions?

  Sports injury packs
• What are reaction profiles ?

  They show the energy changes
• What is reaction profile for an Exothermic reaction?

  Products are at a lower energy than reactants
• What’s the activation energy?

  The minimum amount of energy reactants need to collide with each other and react
• What is reaction profile for an endothermic reaction?

  Products are at higher energy than the reactions
• What is needed to break bonds ?

  Energy
• What is bond breaking ?

  endothermic - energy must be supplied
• What’s bond formation?

  Exothermic - released as new bonds are formed