Copenhagen, Denmark - Dissolving: Reactivity of Metals
During the war the gold medals of some Nobel prize winners were dissolved in Aqua Regia to prevent them falling into the hands of the Nazis. This story from Planet Science is used to introduce the fact that some metals (gold being unavailable in schools!) can be dissolved in acids and then reclaimed by electrolysis. Students then consider the reactivity series of metals.
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Resource by: Planet Science