Metalloid
An element possessing properties intermediate between those of a metal and those of a nonmetal.
Also called a semimetal.
Micelles
Clusters of molecules possessing hydrophilic ionic heads facing the surface of a sphere where they
can interact with water, and possessing hydrophobic hydrocarbon tails in the interior. Soaps form
micelles, facilitating the dissolution of oils and fats.
Miscible
Able to mix in any proportion.
Molality (m)
A concentration unit equal to the number of moles of solute per kilogram of solvent.
Molarity (M)
A concentration unit equal to the number of moles of solute per liter of solution.
Molar mass
The mass in grams of one mole of an element or compound.
Mole (mol)
One mole of a substance contains Avogadro’s number of molecules or atoms. The mass of one mole
of substance in grams is the same as the mass of one molecule or atom in atomic mass units.
Mole fraction (χ)
A unit of concentration equal to the ratio of the number of moles of a particular component to the
total number of moles for all species in the system.