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Hydrogen Bonds01:04

Hydrogen Bonds

8.9K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
8.9K
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

12.3K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
12.3K
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

32.7K
sp3d and sp3d 2 Hybridization
32.7K
¹H NMR of Labile Protons: Deuterium (²H) Substitution00:48

¹H NMR of Labile Protons: Deuterium (²H) Substitution

944
This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
944
Degree of Unsaturation02:05

Degree of Unsaturation

8.1K
The degree of unsaturation (U), or index of hydrogen deficiency (IHD), is defined as the difference in the number of pairs of hydrogen atoms between the compound and the acyclic alkane with the same number of carbon atoms. Each double bond or ring costs two hydrogen atoms compared to a saturated analog and results in one degree of unsaturation.
The degree of unsaturation for hydrocarbons is U = (2C + 2 − H) / 2, where C is the number of carbon atoms and H is the number of hydrogen atoms.
8.1K
Radical Formation: Abstraction00:47

Radical Formation: Abstraction

3.5K
The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
Even though homolysis produces radicals, it is different from radical...
3.5K

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Video Experimental Relacionado

Updated: Aug 9, 2025

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
14:11

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

Published on: March 29, 2016

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Hidrógeno oculto

Eric Hand

    Science (New York, N.Y.)
    |February 16, 2023
    PubMed
    Resumen
    Este resumen es generado por máquina.

    La Tierra puede poseer reservas sustanciales de una fuente de combustible renovable y libre de carbono. Se necesita más investigación para confirmar la disponibilidad y viabilidad de este potencial recurso de energía limpia.

    Área de la Ciencia:

    • Geoquímica
    • Ciencias de la energía
    • Ciencias del medio ambiente

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    Sus antecedentes:

    • El panorama energético mundial está buscando activamente alternativas sostenibles y bajas en carbono a los combustibles fósiles.
    • Comprender el ciclo profundo del carbono de la Tierra es crucial para identificar nuevas fuentes de energía.
    • Se están investigando los posibles depósitos geológicos de carbono secuestrado y su transformación en combustible.