Terms starting with R
53 terms · page 1 of 3
Racemic Mixture
An equimolar mixture of two enantiomers, which shows no net optical rotation.
Nuclear & RadiochemistryRadiation Dose
A measure of the energy deposited in matter by ionising radiation.
Nuclear & RadiochemistryRadioactive Activity
The number of nuclear disintegrations occurring in a sample per unit time.
Nuclear & RadiochemistryRadioactive Decay Series
A sequence of successive radioactive decays leading from a long-lived parent to a stable end product.
Nuclear & RadiochemistryRadioactive Half-Life
The time required for half the nuclei in a radioactive sample to decay.
Nuclear & RadiochemistryRadioactive Tracer
A radioisotope introduced into a system so that its pathway can be followed by detecting its radiation.
Nuclear & RadiochemistryRadioactive Waste
Material containing radionuclides for which no further use is foreseen and which requires controlled disposal.
Nuclear & RadiochemistryRadioactivity
The spontaneous emission of particles or electromagnetic radiation from unstable atomic nuclei.
Nuclear & RadiochemistryRadiocarbon Dating
A dating technique that determines the age of organic material from its residual carbon-14 content.
Nuclear & RadiochemistryRadioisotope
An isotope of an element whose nucleus is unstable and undergoes radioactive decay.
Nuclear & RadiochemistryRadiolysis
The chemical decomposition of a substance caused by ionising radiation.
Nuclear & RadiochemistryRadiometric Dating
The general technique of determining the age of a sample from the decay of a radioactive nuclide it contains.
Nuclear & RadiochemistryRadiopharmaceutical
A radioactive compound administered to a patient for diagnosis or treatment.
Nuclear & RadiochemistryRadiotherapy
The medical use of ionising radiation to destroy cancerous tissue.
Analytical Chemistry & SpectroscopyRaman Spectroscopy
A vibrational technique based on the small shift in frequency of light scattered inelastically by molecules.
Analytical Chemistry & SpectroscopyRandom Error
An error that varies unpredictably in size and direction between repeated measurements.
Solutions & Colligative PropertiesRaoult's Law
The partial vapour pressure of each component of an ideal solution equals its mole fraction times its pure vapour pressure.
Chemical Kinetics & CatalysisRate Constant
The proportionality constant in a rate law, characteristic of a given reaction at a given temperature.
Chemical Kinetics & CatalysisRate Law
An experimentally determined equation expressing reaction rate as a function of reactant concentrations.
Chemical Kinetics & CatalysisRate-Determining Step
The slowest step in a reaction mechanism, which limits the overall rate.
Stoichiometry & Chemical ReactionsReactant
A starting substance that is consumed during a chemical reaction.
Chemical Kinetics & CatalysisReaction Intermediate
A species produced in one step of a mechanism and consumed in a later one, so it does not appear in the overall equation.
Chemical Kinetics & CatalysisReaction Mechanism
The detailed sequence of elementary steps by which reactants are converted into products.
Chemical EquilibriumReaction Quotient
The same ratio as the equilibrium constant but evaluated with the concentrations actually present at any moment.