Chemistry Practice Problems Endothermic & Exothermic Reactions Practice Problems Solution: Consider the vaporization of liquid water to steam...

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Solution: Consider the vaporization of liquid water to steam at a pressure of 1 atm.Is this process endothermic or exothermic?

Problem

Consider the vaporization of liquid water to steam at a pressure of 1 atm.

Is this process endothermic or exothermic?

Solution

We’re being asked to classify vaporization as exothermic or endothermic


Recall that:

Exothermic reactions: lose energy and involve bonds forming; ΔH is negative

Endothermic reactions: gain energy and involve bonds breaking; ΔH is positive


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Additional Practice Problems

Endothermic & Exothermic Reactions

Endothermic & Exothermic Reactions

Q. What is the sign of ΔH for the process depicted in the figure above?

Solved • Thu Jan 03 2019 09:45:02 GMT-0500 (EST)