What chemical is it that combust into flames when you apply watter to it?

I would like to say that I am not planning any thing bad with this info. I am acctuly trying to figger this out for a story I am wrighting and I need a dry chemical that would burn skin when water is applyed. I have seen something simeler in another movie, I think it was fight club. Any how I don't own that movie and am having a hard time trying to figger this out.

Any alkali metal will burn when reacted with water. These include (from smallest to biggest explosion) Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Ru), and Cesium (Cs) (if you had this you would probably want to drop it off a high bridge into water...that big of a blast).

These substances are very reactive and have to be stored in a jelly.
sodium explodes when water is put on it

if you want something that burns your skin when you touch it...dry ice does that.
First, yes it was Fight Club that you saw the famous "Chemical Burn" scene. Second, potassium burns on contact with water, actually it bursts into violently hot and bright flames.
Na, Aka sodium reacts violently with watter how to get? it i dont know, but any ideas would be apreciated if it worked for lighting underwatter fuses.
Sodium metallic (Na), Highly concentrated acids H2SO4, HNO3, also anhydrous alkalies NaOH, KOH. There are many others substances.
Potassium K - is very reactive with water - the reaction is the same as for sodium but is faster and highly exothermic.
The hydrogen ignites.
This reaction with cold water forms the alkali potassium hydroxide and hydrogen gas.
2K(s) + 2H2O(l) → 2KOH(aq) + H2(g)
Lots of alkali metals will start to burn with water. Lots of organics will do the same. Components of some of the batteries such as hydride batteries will burst into flame. If you want to say the chemical 'burned' the skin without actually catching fire, just plain lye (sodium hydroxide) (from drain cleaner) would do the trick . Sulfuric acid (burns) skin. Concentrated acetic acid (3% makes vinegar) will do nasty things to skin. Phosphorus of the correct variety will stick to skin and cause terrible burns. All sides used this in WW2 to start fires and when people got enough of it on themselves, they had to be shot to prevent the agony of being burned to death because there was no way to extinguish the flames and remove the material. (Jumping into water was a temporary soln.)

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