Problem: 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

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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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Problem Details

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

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Endothermic & Exothermic Reactions concept. If you need more Endothermic & Exothermic Reactions practice, you can also practice Endothermic & Exothermic Reactions practice problems.

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Based on our data, we think this problem is relevant for Professor de Laat's class at University of Guelph.