The reactivity series is a key concept in chemistry, but it can sometimes be challenging to demonstrate in a way that is both visually engaging and memorable for students. This practical session will explore two engaging experiments that bring the reactivity series to life and provide opportunities for discussion around chemical reactions, observations, and practical technique. The session will focus on two demonstrations/experiments: Tin Hedgehogs – an engaging investigation that demonstrates the displacement of copper by tin and provides a striking visual result.
Metal vs Metal – an investigation using aluminium, copper and sodium chloride to explore relative reactivity and encourage students to think critically about what constitutes evidence for a reaction.
Tin Hedgehogs Participants will investigate the reaction between tin and copper ions, observing the formation of copper on the surface of tin to create the distinctive “tin hedgehog” structure. The experiment provides a visually striking way to introduce displacement reactions and allows technicians to discuss reagent preparation, equipment requirements, practical setup and safe working practices.The activity also provides an opportunity to explore the chemistry behind the observations, including electron transfer and why a more reactive metal can displace a less reactive metal from its compound.
Metal vs Metal – Aluminium, Copper and Sodium Chloride. The second investigation will look at the interaction between aluminium and copper in the presence of sodium chloride. This practical provides an opportunity to challenge students' assumptions about metal reactivity. Participants will consider what happens when the metals interact, why aluminium can behave unexpectedly due to its oxide layer, and how the presence of sodium chloride can influence the process.
