The question goes as: Determine whether each of the following isexothermic or en

Question

The question goes as: Determine whether each of the following isexothermic or endothermic and indicate the sign of (Delta sign) H.
a. Dry ice evaporating - I believe is endothermic? b. a sparkler burning- I believe is exothermic? c. the reaction that occurs in a chemical cold pack often usedto ice athletic injuries - I believe is exothermic?
a. Dry ice evaporating - I believe is endothermic? b. a sparkler burning- I believe is exothermic? c. the reaction that occurs in a chemical cold pack often usedto ice athletic injuries - I believe is exothermic?

Explanation / Answer

First let me have you a general idea if heat is given by thesystem then H is negative and the reaction isexothermic if heat is absorbed by the system then H is positive andthe reaction is endothermic. a. Dry ice evaporating - to evaporate a dry ice we need to supply heat so heat isabsorbed by the system so its endothermic reaction and here, H is having positive value. b. a sparkler burning- when a sparkler is burning heat is given out to the system sothe reaction is exothermic and so, H value is negative. c. the reaction that occurs in a chemical cold pack often usedto ice athletic injuries - the chemical cold pack is used it it absorbs heat so if weconsider it a system then it absorbs heat and so the reactionis endothermic and H value is positive.

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