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Hydrogen Bonds

Hydrogen Bonds

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...

Reduction of Alkenes: Catalytic Hydrogenation

Reduction of Alkenes: Catalytic Hydrogenation

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...

Hybridization of Atomic Orbitals II

Hybridization of Atomic Orbitals II

sp3d and sp3d 2 Hybridization

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

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

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.

Degree of Unsaturation

Degree of Unsaturation

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.

Radical Formation: Abstraction

Radical Formation: Abstraction

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...

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Related Experiment Video

Updated: Aug 9, 2025

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

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

Published on: March 29, 2016

Hidden hydrogen.

Science (New York, N.Y.)

|February 16, 2023

Summary

This summary is machine-generated.

Earth may possess substantial reserves of a renewable, carbon-free fuel source. Further research is needed to confirm the availability and viability of this potential clean energy resource.

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Last Updated: Aug 9, 2025

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

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Area of Science:

Geochemistry
Energy Science
Environmental Science

Background:

The global energy landscape is actively seeking sustainable, low-carbon alternatives to fossil fuels.
Understanding Earth's deep carbon cycle is crucial for identifying novel energy sources.
Potential geological reservoirs for sequestered carbon and its transformation into fuel are under investigation.

Discussion:

This study explores the possibility of Earth harboring significant, untapped reserves of a renewable, carbon-free fuel.
The research investigates geological conditions and processes that could facilitate the formation and storage of such a fuel.
Analysis focuses on the potential for in-situ generation and accessibility of this hypothetical energy source.

Key Insights:

Preliminary findings suggest Earth's crust might contain vast, undiscovered stores of a clean-burning fuel.
The potential fuel is theorized to be naturally occurring and carbon-neutral, aligning with renewable energy goals.
Further investigation is required to quantify reserves and assess extraction feasibility.

Outlook:

Future research will concentrate on geophysical surveys and geochemical analyses to validate the existence and extent of these fuel reserves.
Technological development for safe and efficient extraction will be a critical next step.
Confirmation of this resource could revolutionize the renewable energy sector and contribute to global decarbonization efforts.