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Proton affinity

Index Proton affinity

The proton affinity (PA, Epa) of an anion or of a neutral atom or molecule is the negative of the enthalpy change in the reaction between above species and proton in the gas phase: These reactions are always exothermic in the gas phase, i.e. energy is released when the reaction advances in the direction shown and enthalpy is negative, while the proton affinity is positive. [1]

33 relations: Atom, Brønsted–Lowry acid–base theory, Carbide, Dimethyl sulfoxide, Electron affinity, Enthalpy, Entropy, Exothermic process, Fluoride, Gibbs free energy, Helium, Helium hydride ion, Hydration reaction, Hydride, Hydrofluoric acid, Hydrogen, Hydroxide, Inorganic Syntheses, Ion, IUPAC books, Journal of Chemical Education, Journal of Physical and Chemical Reference Data, Journal of the American Chemical Society, Lewis acids and bases, Methane, Molecule, Organic synthesis, Ortho-Diethynylbenzene dianion, Potassium hydroxide, Proton, Proton affinity (data page), Sodium hydride, Triphenylmethane.

Atom

An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.

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Brønsted–Lowry acid–base theory

The Brønsted–Lowry theory is an acid–base reaction theory which was proposed independently by Johannes Nicolaus Brønsted and Thomas Martin Lowry in 1923.

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Carbide

In chemistry, a carbide is a compound composed of carbon and a less electronegative element.

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Dimethyl sulfoxide

Dimethyl sulfoxide (DMSO) is an organosulfur compound with the formula (CH3)2SO.

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Electron affinity

In chemistry and atomic physics, the electron affinity (Eea) of an atom or molecule is defined as the amount of energy released or spent when an electron is added to a neutral atom or molecule in the gaseous state to form a negative ion.

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Enthalpy

Enthalpy is a property of a thermodynamic system.

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Entropy

In statistical mechanics, entropy is an extensive property of a thermodynamic system.

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Exothermic process

In thermodynamics, the term exothermic process (exo-: "outside") describes a process or reaction that releases energy from the system to its surroundings, usually in the form of heat, but also in a form of light (e.g. a spark, flame, or flash), electricity (e.g. a battery), or sound (e.g. explosion heard when burning hydrogen).

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Fluoride

Fluoride.

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Gibbs free energy

In thermodynamics, the Gibbs free energy (IUPAC recommended name: Gibbs energy or Gibbs function; also known as free enthalpy to distinguish it from Helmholtz free energy) is a thermodynamic potential that can be used to calculate the maximum of reversible work that may be performed by a thermodynamic system at a constant temperature and pressure (isothermal, isobaric).

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Helium

Helium (from lit) is a chemical element with symbol He and atomic number 2.

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Helium hydride ion

The hydrohelium(1+) cation, HeH+, also known as the helium hydride ion or helium-hydride molecular ion, is a positively charged ion formed by the reaction of a proton with a helium atom in the gas phase, first produced in the laboratory in 1925.

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Hydration reaction

In chemistry, a hydration reaction is a chemical reaction in which a substance combines with water.

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Hydride

In chemistry, a hydride is the anion of hydrogen, H−, or, more commonly, it is a compound in which one or more hydrogen centres have nucleophilic, reducing, or basic properties.

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Hydrofluoric acid

Hydrofluoric acid is a solution of hydrogen fluoride (HF) in water.

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Hydrogen

Hydrogen is a chemical element with symbol H and atomic number 1.

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Hydroxide

Hydroxide is a diatomic anion with chemical formula OH−.

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Inorganic Syntheses

Inorganic Syntheses is a book series which aims to publish "detailed and foolproof" procedures for the synthesis of inorganic compounds.

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Ion

An ion is an atom or molecule that has a non-zero net electrical charge (its total number of electrons is not equal to its total number of protons).

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IUPAC books

The International Union of Pure and Applied Chemistry publishes many books, which contain its complete list of definitions.

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Journal of Chemical Education

The Journal of Chemical Education is a monthly peer-reviewed academic journal available in both print and electronic versions.

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Journal of Physical and Chemical Reference Data

The Journal of Physical and Chemical Reference Data is a quarterly peer-reviewed scientific journal published by AIP Publishing on behalf of the National Institute of Standards and Technology.

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Journal of the American Chemical Society

The Journal of the American Chemical Society (also known as JACS) is a weekly peer-reviewed scientific journal that was established in 1879 by the American Chemical Society.

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Lewis acids and bases

A Lewis acid is a chemical species that contains an empty orbital which is capable of accepting an electron pair from a Lewis base to form a Lewis adduct.

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Methane

Methane is a chemical compound with the chemical formula (one atom of carbon and four atoms of hydrogen).

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Molecule

A molecule is an electrically neutral group of two or more atoms held together by chemical bonds.

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Organic synthesis

Organic synthesis is a special branch of chemical synthesis and is concerned with the intentional construction of organic compounds.

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Ortho-Diethynylbenzene dianion

Ortho-diethynylbenzene dianion is a superbase with the chemical formula of 2−.

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Potassium hydroxide

Potassium hydroxide is an inorganic compound with the formula KOH, and is commonly called caustic potash.

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Proton

| magnetic_moment.

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Proton affinity (data page)

Proton affinities are quoted in kJ/mol, in increasing order of gas-phase basicity of the base.

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Sodium hydride

Sodium hydride is the chemical compound with the empirical formula NaH.

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Triphenylmethane

Triphenylmethane, or triphenyl methane, is the hydrocarbon with the formula (C6H5)3CH.

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Redirects here:

Gas-phase acidity, Gas-phase basicity.

References

[1] https://en.wikipedia.org/wiki/Proton_affinity

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