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Watching sodium being put into water is one of the few things that everyone seems to remember from school science lessons. I would encourage all science teachers do do as much as they can “for real” when it comes to teaching the “reactivity of metals”. If for some reason, there are some experiments you can’t do in school, there are some videos from the Royal Society of Chemistry that you might find useful. There are also a wealth of such videos on youtube, if you are prepared to spend the time looking for them (although, as in the example below, the voiceovers are likely to be so amusing to your students that you might be better off switching off the sound and explaining the science yourself)

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