More Exothermic and endothermic reactions

• Reactions can be more Exothermic or Endothermic
• Energy Transfer can be Measured
• The reaction between hydrochloric acid and sodium hydride produces hydrogen gas
• Procedure for measuring energy transfer

  1. Put 25 cm³ of 0.25 mol dm of hydrochlorie seld and sand

  2. Place the beakers in a water bath set to 25 °C until they are both at the seg (250

  3. Add the HCI followed by the NaOH to a polyarene up with a ld-in fha dagan abov

  4. Take the teperature of the mixture may 30 seconds and record the highest temperat

  5. Repeat steps 1-4 using 0.5 mold and then I moldin' of hydrochloric weld
• Reaction Profiles


  Diagrams that show the places of the reaches and products and how the energy shanges over the course of the reafon
• Exothermic reactions have products at a lower energy than the reactants
• Activation energy


  The bit of energy the reactavis reed to collide with each other and at
• The greater the activation energy, the more energy needs to be supplied by heating the fion madure
• Endothermic reactions have products at a higher energy than the reactants
• In an exothermic reaction the particles release energy to their sumountings, even though the reaction mistare gets warmer, the particles themselves have lost ergs
• Reaction profile for the combustion of methane in air

  CH +20 -> CO21,0