Cool idea! I was wondering how you might implement this technique for a mathematics or chemistry class, which heavily relies on problem-solving techniques?

You could apply to the “technical explanation questions” for those classes — which are the questions that have you explain, outloud, big concepts and how to apply them. For example, in calculus, explaining what a derivative is and the rules for applying it. For actually practicing specific problems, however, you probably need a pen and paper and a little bit more time. Though I could certainly imagine doing quick practice problems in between classes, etc.