Energy changes (5)

• What is an endothermic reaction?

  An endothermic reaction is a chemical reaction that absorbs heat from its surroundings, resulting in an decrease in the temperature of the surroundings.
• What is an exothermic reaction?

  An exothermic reaction is a chemical reaction that releases heat to its surroundings. The temperature of the surroundings increase.
• Is neutralisation endo or exothermic?

  Exothermic
• Is combustion endothermic or exothermic?

  Exothermic
• Is thermal decomposition endo or exothermic?

  Endothermic
• Is this endothermic or exothermic?

  Endothermic

  
• Is this endothermic or exothermic?

  Exothermic

  
• What is activation energy?

  Activation energy is the minimum amount of energy required for a chemical reaction to occur.
• What is a cell?

  Contains chemicals that react to produce electricity
• What is a chemical cell?

  Can be made by connecting two metals that are in contact with an electrolyte
• What is a fuel cell?

  Continuously supplied with fuel (like hydrogen and oxygen) which is oxidised, giving a potential difference.
• When calculating bond energies, if the overall energy change is negative, the reaction is exothermic because energy is given out to the surroundings.