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Glossary |
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| Term | Definition | Article | Siehe auch |
|---|---|---|---|
| heat capacity: Wikipedia: heat capacity |
Energy that is needed to heat a certain amount of a substance (e.g. 1 mol) by 1 K. | ||
| heat of formation: Wikipedia: heat of formation |
The heat released or taken up in the process of isobaric production of one mol of a chemical substance from the elements, corresponds to enthalpy of formation. | standard enthalpy of formation | |
| heat of reaction: Wikipedia: heat of reaction |
The heat released or taken up during an isothermic reaction. It is differentiated into isobaric heat of reaction (equals reaction enthalpy) and isochoric heat of reaction (equals the change in inner energy U during a reaction with constant volume). | ||
| Henry constant: Wikipedia: Henry constant |
A measure of the distribution between water and air. It is defined here as the equilibrium partial pressure in air divided by the equilibirium solubility in water [Pa * m3 / mol]. | ||
| Hess' law: Wikipedia: Hess' law |
Basic law of thermodynamics. The heat of reaction is independent of any intermediates and dependas only on the starting point and the endpoint of the system. | heat of reaction | |
| HPLC: Wikipedia: HPLC |
High performance liquid chromatography: (also know as High pressure liquid chromatography). Separation of chemical substances that cannot be chromatographed with gas chromatography. HPLC uses a pressure pump and stainless steel columns filled with stationary phases of 3, 5 or 10 µm particle size. | liquid chromatography | |
| HPTLC: | In HPTLC (High performance thin layer chromatography) a solvent mixture or a buffer is used as the mobile phase as in TLC. The stationary phase consists of adsorption material with small grain size (approx. 10 µm). | thin layer chromatography | |
| hydrogen bond: Wikipedia: hydrogen bond |
synonymic: H-bond. Attractive interaction between an H-bond donor (color code: red) and an H-bond acceptor (non-binding electron pair) (color code: blue). | molecular interaction potential | |
| hydrophobic effect: Wikipedia: hydrophobic effect |
Also known as hydrophobic interaction. Entropic effect that causes a strong interaction between nonpolar solutes and nonpolar stationary phases in chromatography with an aqueous mobile phase. Also incremental interaction potential for substances with nonpolar and polar molecular building blocks (color code: yellow). | molecular interaction potential |