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Some reactions are more energetic than others. The less energetic a reaction is, the harder it is to detect.

A common non-energetic reaction is the Maillard Reaction, named after the French chef who discovered it. You know how you can cook meat and it turns brown on the outside? That's the Maillard reaction. It's kinda boring - you cook meat over high heat, and it turns brown.


A highly energetic reaction is the production of sodium hydroxide by dropping sodium metal into water, so we get...


2Na + 2H2O -> 2NaOH + H2


then


2H2 + O2 ->2H2O plus the big explosion this experiment is famous for.


(This is NOT how they produce NaOH in industry; they electrolyze salt water - quite often seawater - to get hydrogen, chlorine and NaOH.)

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