Star Trek V tends to be reviled as the worst Trek film ever made. And while there are many issues with the film, I still enjoy viewing it.
Giving you this so that not everyone winds up on the FBI watchlist for searching this:
Ammonia and iodine, mixed together, will create a fairly decent explosive, however that shit is pretty volatile and doesn’t always go off when it should, and will frequently go off when you don’t want it to.
Bleach and potassium chloride, if mixed together in an enclosed space then mixed with oxygen, makes a much smaller blast but you get a very obnoxious toxic slurry thrown everywhere so if your characters want to block something off that’ll do.
Siphoning gunpowder from fireworks and packing it into a pipe closed at both ends with a slight opening for the fuse is the ideal way of getting a pipe bomb, DO NOT try either of the above compounds for that purpose, bad things can and will happen to your characters.
If you want a molotov cocktail to have a bit more impact or burn for a real long time, have characters dissolve Styrofoam in the gas. You’ll get a fire that doesn’t spread as fast or far when the bottle breaks but burns for ages. It isn’t quite napalm but it’s close enough to make a point.
Cellphone detonation needs two phones: One as the detonator, one who’s sim card and battery you’ve cannibalized to receive the call and deliver the electric charge from the battery to the explosive.
Nail bombs are best accomplished with packages of siphoned gunpowder mixed with the cellphone detonation above being put into boxes of nails. Roofing nails are the best for this purpose, as due to a broad head they tend to land point-up even if they hit nothing, meaning that any car driven over the area in the aftermath will require a tire change.
Now, writeblrs, I got on multiple FBI watchlists looking some of these up when I was 12 and trying to make my own fireworks, make good use of it.

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