Chemistry Practice Problems Endothermic & Exothermic Reactions Practice Problems Solution: Indicate the sign of ΔH for the following processe...

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Solution: Indicate the sign of ΔH for the following processes.a. natural gas burning on a stoveb. isopropyl alcohol evaporating from skinc. water condensing from steam

Problem

Indicate the sign of ΔH for the following processes.
a. natural gas burning on a stove
b. isopropyl alcohol evaporating from skin
c. water condensing from steam


Solution

Recall the meaning of the + and - sign on ΔH:

If the reaction absorbs heat → consumes heat from the surroundings → endothermic → +ΔH

If the reaction releases heat → system gives off heat to its surroundings → exothermic → -ΔH

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