Chemistry Practice Problems Endothermic & Exothermic Reactions Practice Problems Solution: Identify each of the following processes as endoth...

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Solution: Identify each of the following processes as endothermic or exothermic and indicate the sign of ∆H.a) ice cube meltingb) water freezing in a freezerc) wood burning in a fire

Problem

Identify each of the following processes as endothermic or exothermic and indicate the sign of ∆H.

a) ice cube melting

b) water freezing in a freezer

c) wood burning in a fire

Solution

We’re being asked to classify each given reaction as exothermic or endothermic


Recall that:

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

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


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Endothermic & Exothermic Reactions

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Q. Classify the following phase changes as endothermic or exothermic.

Solved • Thu Mar 08 2018 10:15:38 GMT-0500 (EST)

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Q. Which phase change, boiling or freezing of water, is exothermic? Explain.

Solved • Fri Aug 18 2017 12:30:45 GMT-0400 (EDT)