Physicochemistry of "self-heating" drinks: example of problem-based learning

Abstract

This article describes how to use a real-life, tangible chemistry problem to promote active methodologies in college classrooms. An experimental exercise concerning the heating of commercial drinks known as "self-heating" products is proposed as a learning activity. The heating process is based on the exothermic character of the dissolution process of certain salts in water. It is an example of how an everyday experience can be used as a starting point for an active, cooperative and problem-based learning. This educational resource promotes the learning of physicochemical concepts such as specific heat, enthalpy of solution, and lattice enthalpy, while emphasizing Science-Technology-Society issues.