Problem: Determine whether each process is exothermic or endothermic and indicate the sign of ΔΗ. a. dry ice evaporating b. a sparkler burning c. the reaction that occurs in a chemical cold pack used to ice athletic injuries

FREE Expert Solution

We are asked to determine whether each process is exothermic or endothermic and indicate the sign of ΔΗ. 


Recall that:

Exothermic reactions

lose energy, releases heat, temperature of the surroundings increases
▪ involves bond formation (for phase change: gas → liquid → solid)
ΔH is negative

Endothermic reactions

gain/requires energy, absorbs heat, temperature of the surroundings decreases
▪ involves breaking bonds (for phase change: solid → liquid → gas)
ΔH is positive


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Problem Details

Determine whether each process is exothermic or endothermic and indicate the sign of ΔΗ. 

a. dry ice evaporating 

b. a sparkler burning 

c. the reaction that occurs in a chemical cold pack used to ice athletic injuries

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