Yes, if you take a massive amount of particles of a given substance, it makes that substance.

And when I say “a massive amount”, chemists used Avogadro’s Number, 6.022x10^23 units, to represent a mole of a substance.

The mass of Moles are generally measured in grams per mole.

So, that’s 602,200,000,000,000,000,000 units of something weighted in grams.

About 4 peas equal 1 gram.

It does depend a lot on the substance though. Like water, as a fluid. Flows together as looks very homogenous.

But if you’re talking about a mixture of various particles that may not blend it makes things very different. You’d likely see a few different substances (like when you smashed different colors of playdough together).