Chemistry

chemistry –

                    the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions.

≡chemical science

↔electronegativity, negativity - (chemistry)

                                                            the tendency of an atom or radical to attract electrons in the formation of an ionic bond.

↔atomic mass, atomic weight, relative atomic mass - (chemistry)

                                                                                          the mass of an atom of a chemical element expressed in atomic mass units.

↔molecular weight, relative molecular mass - (chemistry)

                                                                                the sum of the relative atomic masses of the constituent atoms of a molecule.

↔valence, valency - (chemistry)

                                           a property of atoms or radicals; their combining power given in terms of the number of hydrogen atoms (or the equivalent).

↔pH, pH scale - (from potential of Hydrogen)

                                                                the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and greater than 7 is more basic and less than 7 is more acidic).

↔Dalton's law of partial pressures, law of partial pressures, Dalton's law - (chemistry and physics)

                                  law stating that the pressure exerted by a mixture of gases equals the sum of the partial pressures of the gases in the mixture; the pressure of a gas in a mixture equals the pressure it would exert if it occupied the same volume alone at the same temperature.

↔distribution law - (chemistry)

                                           the total energy in an assembly of molecules is not distributed equally but is distributed around an average value according to a statistical distribution.

↔equilibrium law, law of chemical equilibrium - (chemistry)

                                                                                   the principle that (at chemical equilibrium) in a reversible reaction the ratio of the rate of the forward reaction to the rate of the reverse reaction is a constant for that reaction.

↔Henry's law - (chemistry)

                                        law formulated by the English chemist William Henry; the amount of a gas that will be absorbed by water increases as the gas pressure increases.

↔law of constant proportion, law of definite proportions - (chemistry)

                                                                                               law stating that every pure substance always contains the same elements combined in the same proportions by weight.

↔law of equivalent proportions, law of reciprocal proportions - (chemistry)

                                                                                                      law stating that the proportions in which two elements separately combine with a third element are also the proportions in which they combine together.

↔Dalton's law, law of multiple proportions - (chemistry)

                                                                               law stating that when two elements can combine to form more than one compound the amounts of one of them that combines with a fixed amount of the other will exhibit a simple multiple relation.

↔law of mass action - (chemistry)

                                                 the law that states the following principle: the rate of a chemical reaction is directly proportional to the molecular concentrations of the reacting substances.

↔Mendeleev's law, periodic law - (chemistry)

                                                               the principle that chemical properties of the elements are periodic functions of their atomic numbers .

↔natural science -

                           the sciences involved in the study of the physical world and its phenomena.

↔chemoimmunology, immunochemistry -

                                                         the field of chemistry concerned with chemical processes in immunology (such as chemical studies of antigens  and antibodies).

↔ Mendeleev's law -

                                                          the field of chemistry concerned with chemical processes in immunology (such as chemical studies of antigens and antibodies).

↔organic chemistry -

                              the chemistry of compounds containing carbon (originally defined as the chemistry of substances produced by living organisms but now extended to substances synthesized artificially).

↔inorganic chemistry -

                                 the chemistry of compounds that do not contain hydrocarbon radicals.

↔physical chemistry -

                               the branch of chemistry dealing with the physical properties of chemical substances.

↔electrochemistry -

                                branch of chemistry that deals with the chemical action of electricity and the production of electricity by chemical reactions.

↔femto chemistry - 

                           the branch of chemistry that studies elementary (often very fast) chemical reactions as they occur; the experimental methods are often based on the use of femto second laser pulses.

↔geochemistry -

                           the chemistry of the earth's crust.

↔photochemistry -

                                branch of chemistry that deals with the chemical action of light.

↔nuclear chemistry, radiochemistry -

                                                   the chemistry of radioactive substances.

↔surface chemistry -

                               the branch of chemistry that studies processes occurring at interfaces between phases (especially those between liquid and gas).

↔atomist theory, atomistic theory, atomic theory, atomism - (chemistry)

                                                                                                    any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles; "the ancient Greek philosophers Democritus and Epicurus held atomic theories of the universe".

↔Arrhenius theory of dissociation, theory of dissociation, theory of electrolytic dissociation - (chemistry)

                                       theory that describes aqueous solutions in terms of acids (which dissociate to give hydrogen ions) and bases (which dissociate to give hydroxyl ions); the product of an acid and a base is a salt and water.

↔Ostwald's theory of indicators, theory of indicators - (chemistry)

                                                                                            the theory that all indicators are either weak acids or weak bases in which the color of the ionized form is different from the color before dissociation.