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dalton
used to express atomic and molecular masses, it is the approximate mass of a hydrogen atom, a proton, or a neutron and is one-twelfth of the mass of an unbound carbon-12 atom at rest; it is equivalent to the atomic mass unit
Dalton’s atomic theory
the first scientific theory to relate chemical changes to the structure, properties, and behavior of the atom
Dalton's law of partial pressures
states that for a mixture of gases in a container, the total pressure exerted is the sum of the pressures that each gas would exert if it were alone
decomposition reaction
a reaction in which one reactant breaks down to form two or more products
delocalized electrons
electrons that are free to move between the bond (in multiple bonding)
derived units
units that are defined in terms of other SI base units
diatomic molecule
a molecule containing exactly two atoms
diffraction
the bending of waves around a barrier
diffusion
the movement of particles from areas of higher concentration to areas of lower concentration
dilute
a solution in which there is a small amount of solute in a given amount of solvent
dimensional analysis
a technique that involves the study of the dimensions (units) of physical quantities
dipeptide
two amino acids joined together
distillation
the evaporation and subsequent collection of a liquid by condensation as a means of purification
DNA (deoxyribonucleic acid)
DNA is a polynucleotide that carries our genetic coding; its function is to direct the body in the synthesis of proteins
double bond
a bond in which two pairs of electrons are shared
double replacement reaction
a reaction in which two reactants form products by having the cations exchange places
ductile
can be drawn out into thin wires
dynamic equilibrium
a state of equilibrium where change is still occurring on a molecular level even though the macroscopic properties remain constant; occurs when the rate of the forward reaction is equal to the rate of the reverse reaction

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Feb 23, 2012

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CK.SCI.ENG.SE.2.Chemistry-Glossary.26.4

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