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

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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


100% (65 ratings)
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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