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Royal Institution
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Tales From the Prep Room: Alkali Metals
This video from the Royal Institution shows how a small piece of sodium on the end of a match head will burn if a few drops of water are added to the sodium. All alkali metals are very reactive in air and with water. Potassium is more reactive than sodium, and the video shows how only one drop of water can make the potassium burn and light the match head.
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