- Magnetic Quantum Number (mc)
- Quantum mechanical solution to a wave equation that designates the
particular orbital within a given set (s, p, d, f ) in which a electron
- A two-armed barometer.
- A measure of the amount of matter in an object. Mass is usually measured
in grams or kilograms.
- Mass Action Expression
- For a reversible reaction, aA + bB cC + dD the product of the
concentrations of the products (species on the right), each raised to the power
that corresponds to its coefficient in the balanced chemical equation, divided
by the product of the concentrations of reactants (species on the left), each
raised to the power that corresponds to its coefficient in the balanced chemical
equation. At equilibrium the mass action expression is equal to K; at other
times it is Q.[C]c[D]d [A]a[B]b = Q, or at equilibrium K
- Mass Deficiency
- The amount of matter that would be converted into energy if an atom were
formed from constituent particles.
- Mass Number
- The sum of the numbers of protons and neutrons in an atom; an integer.
- Mass Spectrometer
- An instrument that measures the charge-to-mass ratio of charged particles.
- For further information see Mass Spectrometry
- Anything that has mass and occupies space.
- The sequence of steps by which reactants are converted into products.
- Melting Point
- The temperature at which liquid and solid coexist in equilibrium; also the
- The shape assumed by the surface of a liquid in a cylindrical container.
- An element below and to the left of the stepwise division (metalloids) in
the upper right corner of the periodic table; about 80% of the known elements
- Metallic Bonding
- Bonding within metals due to the electrical attraction of positively
charges metal ions for mobile electrons that belong to the crystal as a whole.
- Metallic Conduction
- Conduction of electrical current through a metal or along a metallic
- Elements with properties intermediate between metals and nonmetals: B, Al,
Si, Ge, As, Sb, Te, Po, and At.
- Refers to the overall processes by which metals are extracted from ores.
- Metathesis Reactions
- Reactions in which two compounds react to form two new compounds, with no
changes in oxidation number. Reactions in which the ions of two compounds
- Method of Initial Rates
- Method of determining the rate-law expression by carrying out a reaction
with different initial concentrations and analyzing the resultant changes in
- The ability of one liquid to mix with (dissolve in) another liquid.
- A sample of matter composed of two or more substances, each of which
retains its identity and properties.
- A substance such as hydrogen, deuterium, oxygen or paraffin capable of
slowing fast nuetrons upon collision.
- Concentration expressed as number of moles of solute per kilogram of
- Number of moles of solute per litre of solution.
- Molar Solubility
- Number of moles of a solute that dissolve to produce a litre of saturated
- Molecular Equation
- Equation for a chemical reaction in which all formulas are written as if
all substances existed as molecules; only complete formulas are used.
- Molecular Formula
- Formula that indicates the actual number of atoms present in a molecule of
a molecular substance.
- Molecular Geometry
- The arrangement of atoms (not lone pairs of electrons) around a central
atom of a molecule or polyatomic ion.
- Molecular Orbital
- An orbit resulting from overlap and mixing of atomic orbitals on different
atoms. An MO belongs to the molecule as a whole.
- Molecular Orbital Theory
- A theory of chemical bonding based upon the postulated existence of
- Molecular Weight
- The mass of one molecule of a nonionic substance in atomic mass units.
- The smallest particle of an element or compound capable of a stable,
- Mole Fraction
- The number of moles of a component of a mixture divided by the total number
of moles in the mixture.
- Monoprotic Acid
- Acid that can form only one hydronium ion per molecule; may be strong or
- Acid that contains one ionizable hydrogen atom per formula unit.
- Mother Nuclide
- Nuclide that undergoes nuclear decay.