Mixture:
A mix of two substances like salt and water, or the air in the atmosphere
A mixture is a PHYSICAL change and can be undone physically.
ALSO, the properties of the components are retained.
The composition can vary if more stuff is just added, whereas a compound can’t just add more stuff.

Heterogeneous Mixture:
Two different substances combined, like salt and water.
The components are big enough to separate them.

Homogeneous Mixtures AKA Solutions:
One or more substances dissolved together into one mixture.
Gaseous mixtures DON’T really count here
The molecules are so well mixed that you can’t see separate components, AKA Uniform

Solvent:
The dominant substance that the solutes mix with

Solute:
The stuff added that then mixed with the solvent
A solid can ALSO be SOLID, like copper and zinc, or gold and copper to make a wedding ring.

Crystallization:
When the solute comes out of the solvent as crystals, like salt in water, when the water evaporates.

Molarity/molar concentration:
Moles of solute divided by the total volume of the solution in Liters.

Stock Solution:
A state in where the solution is just itself, and then you can add water to make it less strong.
C1 and V1

Dilution:
Use this easy equation to find either needed concentration or volume, usually V1.

Example of what Dilution looks like: