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960 terms · page 31 of 40
Product
A substance formed as a result of a chemical reaction.
Chemical Kinetics & CatalysisPromoter
A substance that has little catalytic activity itself but greatly increases the effectiveness of a catalyst.
Biochemistry & Polymer ChemistryProtein
A large biomolecule made of one or more chains of amino acids folded into a specific three-dimensional shape.
Atomic Structure & PeriodicityProton
A positively charged subatomic particle found in the atomic nucleus, carrying a charge of +1 elementary unit.
Acids, Bases & SaltsProton Affinity
The energy released when a gaseous species accepts a proton, measuring intrinsic basicity free of solvent effects.
Chemical Kinetics & CatalysisPseudo-First-Order Reaction
A higher-order reaction that behaves as first order because one reactant is present in such large excess that its concentration is…
Foundations of ChemistryPure Substance
Matter with a fixed chemical composition and a definite set of physical properties, comprising either a single element or a single compound.
Foundations of ChemistryPurity
The mass fraction of the desired substance in a sample, usually expressed as a percentage of the total mass.
Stoichiometry & Chemical ReactionsPyrolysis
The thermal decomposition of a substance at high temperature in the absence of oxygen.
Analytical Chemistry & SpectroscopyQualitative Analysis
Analysis carried out to establish which species are present in a sample.
Analytical Chemistry & SpectroscopyQuantitative Analysis
Analysis carried out to determine the amount or concentration of a species in a sample.
Atomic Structure & PeriodicityQuantum Mechanical Model
The modern description of the atom in which electrons are represented by wavefunctions giving probability distributions rather than…
Biochemistry & Polymer ChemistryQuaternary Structure
The arrangement of two or more folded polypeptide chains into a functional protein complex.
Organic ChemistryRacemic 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.