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Endothermic vs. Exothermic, Lecture notes of Chemistry

Exothermic Reaction- a reaction or process that releases energy to its surroundings. There is energy sored in the bonds of any substance. Any ...

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2021/2022

Uploaded on 09/27/2022

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Endothermic vs. Exothermic
5/5/22
L.T. – Today I will apply my knowledge of heat transfer to understand the
concepts of endothermic and exothermic.
Warm-up:
If 335 g of water at 65.5˚C loses 7811 J of heat, what is the final temperature of
the water? Liquid water has a specific heat of 4.186J/g˚C.
The heat lost from the water was given to a chicken breast for thawing. The
temperature changed from 1oC to 22oC. The specific heat of chicken is 1.64J/goC.
How much did the chicken breast weigh?
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Endothermic vs. Exothermic

  • L.T. – Today I will apply my knowledge of heat transfer to understand the concepts of endothermic and exothermic.
  • Warm-up:
    • If 335 g of water at 65.5˚C loses 7811 J of heat, what is the final temperature of the water? Liquid water has a specific heat of 4.186J/g˚C.
    • The heat lost from the water was given to a chicken breast for thawing. The temperature changed from 1oC to 22oC. The specific heat of chicken is 1.64J/goC. How much did the chicken breast weigh?

Endothermic (endo  “ENTER”)

  • Endothermic Reaction- a reaction or process that absorbs energy from its surroundings.
  • Heat (energy) is taken in
  • Temperature of the surrounding environment drops
  • These processes typically feel COLD to the touch

Exothermic (exo  “EXIT”)

  • Exothermic Reaction- a reaction or process that releases energy to its surroundings.
  • Heat (energy) is given off
  • Temperature of the surrounding environment rises
  • These processes typically feel HOT to the touch

Exothermic

  • Other examples of exothermic reactions and processes

Graphing Endothermic and Exothermic Reactions

6CO 2 + 6H 2 O + Energy C 6 H 12 O 6 + 6O 2 Energy absorbed in reaction Activation Energy Energy used in bond breaking Energy released in bond making

Graphing Endothermic and Exothermic Reactions

CH 4 + 2O 2 CO 2 + 2H 2 O + Energy Energy released in bond making Activation Energy Energy used in bond breaking