Chemistry

(chemistry) a process in which one substance permeates another; a fluid permeates or is dissolved by a liquid or solid

(chemistry) the ratio of the total mass of an element in the earth's crust to the total mass of the earth's crust; expressed as a percentage or…

(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected

(chemistry) in the formation of a coordinate bond it is the compound to which electrons are donated

(chemistry) the amount of free acid present in fat as measured by the milligrams of potassium hydroxide needed to neutralize it; "as the glyceri…

(chemistry) a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium

(chemistry) the capacity of a substance to take part in a chemical reaction; "catalytic activity"

(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA

(biochemistry) a nucleoside that is a structural component of nucleic acids; it is present in all living cells in a combined form as a constitue…

(biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction

(chemistry) variability in chemical composition without variation in crystalline form

(biochemistry) interference in or inhibition of the physiological action of a chemical substance by another having a similar structure

(chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst

(chemistry) of or relating to or containing one or more benzene rings; "an aromatic organic compound"

(chemistry) theory that describes aqueous solutions in terms of acids (which dissociate to give hydrogen ions) and bases (which dissociate to gi…

(chemistry) any process of combination (especially in solution) that depends on relatively weak chemical bonding

(chemistry) the mass of an atom of a chemical element expressed in atomic mass units

(chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles; "the ancient Greek philosop…

(chemistry) the mass of an atom of a chemical element expressed in atomic mass units

(chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles; "the ancient Greek philosop…

(chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles; "the ancient Greek philosop…

(chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles; "the ancient Greek philosop…

(chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance

(chemistry) an ionic compound that resists changes in its pH

(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected

(chemistry) a series of linked atoms (generally in an organic molecule)

(chemistry) any process determined by the atomic and molecular composition and structure of the substances involved

(chemistry) a series of linked atoms (generally in an organic molecule)

(chemistry) any process determined by the atomic and molecular composition and structure of the substances involved

(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight

(chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance

(chemistry) two or more atoms bound together as a single unit and forming part of a molecule

(chemistry) any process determined by the atomic and molecular composition and structure of the substances involved

(chemistry) a process in which one or more substances are changed into others; "there was a chemical reaction of the lime with the ground water"

(chemistry) a chain of atoms in a molecule that forms a closed loop

(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight

(chemistry) The degree of structural order in a solid.; "The crystallinity of drug substances and additives is one of the fundamental physicoche…

(biochemistry) a waxy transparent material that occurs in the cuticle of plants and consists of highly polymerized esters of fatty acids

(biochemistry) a class of hemoprotein whose principal biological function is electron transfer (especially in cellular respiration)

(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…

(chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance

(chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance

(biochemistry) a long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix; associated with…

(biochemistry) a long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix; associated with…

(chemistry) the property of certain substances that enables them to exist in two distinct crystalline forms

(chemistry) a reaction in which an elementary substance displaces and sets free a constituent element from a compound

(chemistry) a reaction in which an elementary substance displaces and sets free a constituent element from a compound

(chemistry) the temporary or reversible process in which a molecule or ion is broken down into smaller molecules or ions

(chemistry) the total energy in an assembly of molecules is not distributed equally but is distributed around an average value according to a st…

(biochemistry) a long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix; associated with…

(chemistry) a chemical decomposition reaction produced by passing an electric current through a solution containing ions

(chemistry) the tendency of an atom or radical to attract electrons in the formation of an ionic bond

(chemistry) a colloid in which both phases are liquids; "an oil-in-water emulsion"

(biochemistry) of a process accompanied by or requiring the absorption of energy; the products of the process are of greater free energy than th…

(chemistry) the ratio of concentrations when equilibrium is reached in a reversible reaction (when the rate of the forward reaction equals the r…

(chemistry) the principle that (at chemical equilibrium) in a reversible reaction the ratio of the rate of the forward reaction to the rate of t…

(biochemistry) of a process accompanied by the release of energy; "diffusion is an exergonic process"

(physical chemistry) a distinct state of matter in a system; matter that is identical in chemical composition and physical state and separated f…

(chemistry) the negative univalent acyl radical CHO that occurs in aldehydes

(chemistry) the weight of an element or compound that will combine with or displace 8 grams of oxygen or 1.007 97 grams of hydrogen; the atomic…

(chemistry) two or more atoms bound together as a single unit and forming part of a molecule

(chemistry) law formulated by the English chemist William Henry; the amount of a gas that will be absorbed by water increases as the gas pressur…

(chemistry) the absorption of a liquid by a solid or gel

(chemistry) not participating in a chemical reaction; chemically inert; "desired amounts of inactive chlorine"

(chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemic…

(chemistry) a surface forming a common boundary between two things (two objects or liquids or chemical phases)

(chemistry) the principle that (at chemical equilibrium) in a reversible reaction the ratio of the rate of the forward reaction to the rate of t…

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

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

(chemistry) law stating that the proportions in which two elements separately combine with a third element are also the proportions in which the…

(chemistry) the law that states the following principle: the rate of a chemical reaction is directly proportional to the molecular concentration…

(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…

(chemistry) law stating that the proportions in which two elements separately combine with a third element are also the proportions in which the…

(chemistry) a relatively long chain of atoms in a molecule

(chemistry) a relatively long chain of atoms in a molecule

(biochemistry) dissolution or destruction of cells such as blood cells or bacteria

(chemistry) the principle that chemical properties of the elements are periodic functions of their atomic numbers

(chemistry) the nonrandom movement of an atom or radical from one place to another within a molecule

(chemistry) a substance consisting of two or more substances mixed together (not in fixed proportions and not with chemical bonding)

(chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule

(chemistry) an atom having a valence of one

(chemistry) the state of having a valence greater than two

(chemistry) the state of having a valence greater than two

(chemistry) the tendency of an atom or radical to attract electrons in the formation of an ionic bond

(biochemistry) any of various macromolecules composed of nucleotide chains that are vital constituents of all living cells

(biochemistry) a polynucleotide whose molecules contain relatively few nucleotides

(biochemistry) a polynucleotide whose molecules contain relatively few nucleotides

(physical chemistry) the pressure exerted by a solution necessary to prevent osmosis into that solution when it is separated from the pure solve…

(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 colo…

(chemistry) the principle that chemical properties of the elements are periodic functions of their atomic numbers

(chemistry) a tabular arrangement of the chemical elements according to atomic number as based on the periodic law

(physical chemistry) a distinct state of matter in a system; matter that is identical in chemical composition and physical state and separated f…

(physical chemistry) a fourth state of matter distinct from solid or liquid or gas and present in stars and fusion reactors; a gas becomes a pla…

(chemistry) the existence of different kinds of crystal of the same chemical compound

(chemistry) the existence of different kinds of crystal of the same chemical compound

(biochemistry) a linear polymer whose molecule is composed of many nucleotide units constituting a section of a nucleic acid molecule

(chemistry) the state of having a valence greater than two

(chemistry) the state of having a valence greater than two

(chemistry) two or more atoms bound together as a single unit and forming part of a molecule

(chemistry) a process in which one or more substances are changed into others; "there was a chemical reaction of the lime with the ground water"

(chemistry) the process of refinement or purification of a substance by distillation

(chemistry) the mass of an atom of a chemical element expressed in atomic mass units

(chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule

(chemistry) a method of producing pure water; a solvent passes through a semipermeable membrane in a direction opposite to that for natural osmo…

(biochemistry) a long linear polymer of nucleotides found in the nucleus but mainly in the cytoplasm of a cell where it is associated with micro…

(chemistry) a chain of atoms in a molecule that forms a closed loop

(biochemistry) a long linear polymer of nucleotides found in the nucleus but mainly in the cytoplasm of a cell where it is associated with micro…

(chemistry) the stage at which a substance will receive no more of another substance in solution or in a vapor

(chemistry) a substance other than a catalyst that facilitates the start of a catalytic reaction

(chemistry) a substance other than a catalyst that facilitates the start of a catalytic reaction

(chemistry) an apparatus that can determine the sequence of monomers in a polymer

(chemistry) an apparatus that can determine the sequence of monomers in a polymer

(chemistry) a process in which one substance permeates another; a fluid permeates or is dissolved by a liquid or solid

(chemistry) the three traditional states of matter are solids (fixed shape and volume) and liquids (fixed volume and shaped by the container) an…

(chemistry) the three traditional states of matter are solids (fixed shape and volume) and liquids (fixed volume and shaped by the container) an…

(chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole intege…

(chemistry) a change directly from the solid to the gaseous state without becoming liquid

(physical chemistry) a sample of matter in which substances in different phases are in equilibrium; "in a static system, oil cannot be replaced…

(chemical analysis) a counterweight used in chemical analysis; consists of an empty container that counterbalances the weight of the container h…

(chemistry) theory that describes aqueous solutions in terms of acids (which dissociate to give hydrogen ions) and bases (which dissociate to gi…