Chemistry Practice Problems Endothermic & Exothermic Reactions Practice Problems Solution: Which one of the following is an endothermic proce...

Solution: Which one of the following is an endothermic process?A) ice meltingB) water freezingC) boiling soupD) Hydrochloric acid and barium hydroxide are mixed at 25 °C: the temperature increases.E) Both A and C

Problem

Which one of the following is an endothermic process?

A) ice melting

B) water freezing

C) boiling soup

D) Hydrochloric acid and barium hydroxide are mixed at 25 °C: the temperature increases.

E) Both A and C

Solution

We’re being asked to identify the endothermic reaction among the choices 


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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