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Eugene S.
University of Minnesota - Twin Cities

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Problem 52 Medium Difficulty

Is each process exothermic or endothermic? Indicate the signof H.
a. dry ice evaporating
b. a sparkler burning
c. the reaction that occurs in a chemical cold pack used to ice athletic injuries

Answer

c)
The reaction that occurs in a chemical cold pack is endothermic as it absorbs energy from the
surroundings. So the sign of $\Delta \mathrm{H}$ is positive.

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Video Transcript

us and asked us to indicate whether each is endo thermic or extra thermic. And what peace sign of Delta H is. And so and a thermic means he is absorbed by the reaction and XO Thermic means heat is released by the reaction. So a is dry ice evaporating. And that's going to be endo thermic, since it will absorb heat from the environment and have a positive Delta H. Because he is being added to the system. B is a sparkler burning. This will be X a thermic, since the sparkler will be releasing heat and therefore having negative Delta H. Since the system is losing heat C is the reaction in a cold pack usedto ice athletes. So I'll just write cold pack reaction. And that's also going to be endo thermic like the dry ice example, and therefore have a positive Delta H. And that's because the cold pack is absorbing heat from the environment and therefore will have a positive adult age

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