Solubility changes with temperature. Gases have solubility and that also changes with temperature. A demonstration is given that shows how the solubility of a solute also changes by changing the nature of the solvent. Duration: 8:04.
The mole is formally introduced in this video lesson as a large number by which atoms and molecules are counted. The concentration of solutions is often given in units of moles per liter so that the chemist is able to get a handle on the number of atoms or molecules within the solution. Duration: 8:52.