Solution: Which of these physical changes would require the liberation of energy, exothermic?a. melting pointb. boiling pointc. condensation of steam to form liquidd. sublimation from a solid to a gas

Problem

Which of these physical changes would require the liberation of energy, exothermic?
a. melting point
b. boiling point
c. condensation of steam to form liquid
d. sublimation from a solid to a gas

Solution

We’re being asked to determine which given reaction is exothermic


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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