Before the periodic table/atomic theory was nailed down, how did anyone figure out what substances were actually elements?

It seems like it would be extremely easy to mistake a common, stable molecule like salt for something elemental. How did people break down substances to the point of purifying them, and then how did they know they couldn't purify them any further? It seems easy now to theorize what an element of a certain weight would look or act like, but before most of them were known did they have anything to go off of, or was it guesswork?

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u/graaahh — 12 days ago

Need help remembering an old movie I saw last year, details in post!

Here's what I remember:

* I think the movie is black and white. Even if it's not it's quite an old movie.

* A band of musicians is on their way to a gig at a festival or something when they're forced to stay the night at this hotel/cabin/inn/something. The woman who runs it is beautiful but secretive. The musicians are treated well but told not to go in her room.

* At one point, the leader of the band takes out his guitar in the living room to play and sing. I think maybe to prove to the secretive woman that they're really musicians or something.

* If I recall correctly, it turns out the woman is part of a small gang who are planning to do something bad (they're watching the visitors on cameras or something, thinking maybe they're there to spy on the gang and catch them.)

* The vibe isn't comedic I don't think. I remember it as being vaguely threatening, like an old 60's-ish thriller movie kind of.

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u/graaahh — 1 month ago

I opened a map showing a list of thousands of businesses and now all those pins are showing every time I open Maps. How do I turn it off?

I clicked on a map linked on reddit that showed thousands of different pins all around the country. Now when I open my regular Maps app I still see all the pins and can't figure out how to turn it off. I tried deleting it from my search history but it didn't help.

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u/graaahh — 1 month ago

Why does the drawing of the high side of this transformer show a gap in the windings? Is that a real gap, and if so, what's the purpose of it?

u/graaahh — 3 months ago

What's the best bad movie of every year? I tried to find out. Help me narrow down the list!

u/graaahh — 4 months ago

Was changing the oil on a 2012 Ford Fusion 3.0L, and I noticed this belt is not in good condition. Can you tell me what this belt is, so I can get an estimate to get it replaced?

u/graaahh — 5 months ago