Gabriel Pinto, Marisa Prolongo. Science in School. Issue 43 : Spring 2018
Proyecto de Innovación Educativa de UPM, Chem-Innova, IE1718.0504
Use a lollipop to activate colour-changing redox reactions in this simple but eye-catching activity.
Teaching oxidation-reduction (redox) reactions is part of all secondary-school chemistry curricula. In this article, we describe a vivid colour-changing demonstration to illustrate a chain of redox reactions, whereby electrons are transferred between different compounds and ions. The activity is suitable as a teacher demonstration, or older students could carry out the experiment themselves.
The chemical chameleon demonstration produces vivid colour changes as a result of redox reactions.