Notes gb lab 08 endothermic and exothermic reactions

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Notes gb lab 08 endothermic and exothermic reactions

  1. 1. Lab 8Lab 8“Endo and ExoThe ReactionTwins”
  2. 2. The student will investigate andunderstand chemical changes inmatterThe student will be able to recognizethat some types of chemical reactionsrequire continuous input of energy(Endothermic) and others releaseenergy (Exothermic)
  3. 3. Endothermic ReactionExothermic Reaction
  4. 4. A chemicalreaction thatrequirescontinuous inputof energy.It feels cold. Endothermic reaction of barium hydroxideand an ammonium salt. Mix the twosolids; they react, and the productsdissolve in water of hydration. Thereaction flask may be passed around forstudents to feel how cold it is.
  5. 5. A chemicalreaction thatcontinuouslyreleasesenergy.It feels hot.Light Energy could be released inthe exothermic reaction taking placein things such as glow sticks.
  6. 6. Temperature change is anindicator or clue of a chemicalreactionThe temperature change happensbecause of the combination ofchemicals and energy
  7. 7. There are two types ofchemical reactions that causea temperature changeEndothermic ReactionsExothermic Reactions
  8. 8. Endothermic and ExothermicReactions are shown using a linegraph
  9. 9. The graph is written as change intemperature over time
  10. 10. In Endothermic Reactions,there is a decrease intemperature or a temperaturedrop.
  11. 11. Endothermic Reactions requiremore energy to break theoriginal chemical bonds andform new ones
  12. 12. Energy is absorbed from theenvironment through acontinuous input of energy andthe product feels coldCold Packs
  13. 13. Endothermicin Blue
  14. 14. Exothermic Reactions give offenergy in the form of thermalenergy (heat). (increase intemperature)
  15. 15. Exothermic Reactions requireLess energy is to break bonds toform new onesBurning wood, paper, handwarmers
  16. 16. We use a line graph to show thechanges in endothermic andexothermic reactions
  17. 17. Exothermicreaction inGreen
  18. 18. The steeper the line(Slope) thefaster the energy change

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