ASE 2027 Annual Conference

Most teachers have been confronted in the classroom by a "chemical grenade" - a question from a pupil that may or may not have been intended to cause damage, but which was also both hard to answer and very interesting, often just touching the edges of the syllabus.  

By sharing some of the most interesting chemical grenades from my teaching, I hope to outline an approach to answering these questions in the pursuit of developing teachers' chemistry knowledge and ability to explain abstract concepts from physical an inorganic chemistry at GCSE and A-level in a "rigorous but hand waving" way that pupils might appreciate.  

Some grenades to be considered, most drawn from A-level pupils, include: "When an equilibrium responds to an increase in pressure, does the pressure ever return to its old value?", "If copper complexes are coloured because of d-d transitions, why don't they just re-emit the light they absorbed?", "How do chiral molecules rotate plan polarised light differently when they are randomly oriented?", "Why doesn't adding a solid to an equilibrium mixture change the position of equilibrium?"  

I hope to show that working out the answers to these questions, and then how to present the answer to pupils, can be tricky, but also leads to a better understanding of the chemistry being taught.