Hydrogen burden

If one would ask a chemist not burdened with any knowledge about the peculiar thermodynamics that characterise hydrophobic hydration, what would happen upon transfer of a nonpolar molecule from the gas phase to water, he or she would probably predict that this process is entropy driven and enthalpically highly unfavourable. This opinion, he or she wo ild support with the suggestion that in order to create room for the nonpolar solute in the aqueous solution, hydrogen bonds between water molecules would have to be sacrificed. 

Winkler and Burden [47] Topological, constitutional, hydrogen-bonding, and descriptors based on adjacency matrices... 

Even small increases in efficiency can help. If fuel cell vehicles ever become the predominate means of transportation, hydrogen demand will soar. Advances in hydrogen production and purification will ease the burden and help make these processes as environmentally friendly as possible. 

This is one of the better party tricks you can perform for any willing dinner host burdened with a cabinet full of tarnished silver pieces. Forewarn, however, that many pieces coming out of the treatment are still in need of some buffing with silver polish. Lively conversation is guaranteed, especially concerning the source of the tarnishing hydrogen sulfide gas. 

Alkenes with H atoms in the allyl position are also perfectly capable of a Heck reaction. Depending on their precise structure—among other things, e. g., on whether their C=C double bond is part of a ring system or not—the C=C double bond, however, need not necessarily occupy the same position in the coupling product as in the initial alkene, and in some cases cannot do so at all. We will not burden ourselves with this problem here and rather restrict our attention to the alkenes without allylic hydrogens as participants in Heck reactions. 

If hydrogen-based fuel cells were put to use generating electricity on a small scale close to areas where electricity is needed, the burden on the current electric grid—the system that generates and distributes electricity—could be eased. 

Participants pointed out that other technologies can decrease nations dependence on oil, reduce pollution, relieve the burden on the electric grid, or provide opportunities for rural development. But hydrogen-based applications can provide all of these benefits. This is one characteristic of hydrogen that might differentiate it from other energy sources or technologies. 

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