Glossary
Isotopes: Atoms or ions of an element with different numbers of neutrons in their atomic nucleus. Isotopes have the same atomic number but different mass number. Isotopes have very similar chemical properties but sometimes differ greatly in nuclear stability.
Melting Point: The temperature at which the vapor pressure of a liquid is equal to the vapor pressure of the corresponding solid form. At this temperature a substance either becomes a solid or a liquid depending on whether the surrounding temperature decreases or increases respectively.
Mixture: A sampling of matter that contains two or more substances physically combined, i.e. no chemical process is involved in the making of it.
Molality: The number of moles of solute per 1,000 grams of solvent.
Molarity: The number of moles of solute per liter of solution.
Mole Fraction: The number of moles of solute per unit total moles of solution.
Molecule: The smallest particle of an element or compound that retains the chemical properties of the element or compound. A molecule is a collection of chemically bound atoms with characteristic composition and structure.