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Mg + CO2

I thought I had posted this before. It is from the UC Davis Picnic Day chemistry magic show.

If you start a strip of magnesium on fire, sandwich it between a couple slabs of dry ice, it will react like crazy. The overall transformation is 2 Mg + CO2 -> 2 MgO + C - so in other words, it would not be wise to use a CO2 extinguisher on a magnesium fire.