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what makes those rocks in the party poppers pop?

i know its some kind of reactant but what?

The secret ingredient is silver fulminate, according to this Wikipedia article:

http://en.wikipedia.org/wiki/Bang_snaps

Burf2 years ago

Snap rocks are gravel impregnated with a minute quantity of silver fulminate (AgCNO). Silver fulminate is a percussive that detonates under impact. Snap rocks are considered safe because the mass of the percussive is miniscule in comparison to that of the mass of the gravel.