# Tag Info

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This process is similar to re-cycling chromatography or recycling HPLC. In a more strict sense, it does not do any good, at least theoretically, if you keep on recycling all the eluate and transfer it back to the column. What makes more sense is that you collect fractions and choose certain fractions for recycling.

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Dipole moment refers specifically to the second moment in a multipole expansion. An electric dipole moment appears in the expression for the second moment in the multipole expansion of the electric field (or potential) produced by a distribution of electrical charges. "Dipole" is generally a casual abbreviated way to refer to the same thing$\dagger$. In ...

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The (electric) dipole moment is a mathematically clearly defined quantity, the product of charge difference and distance A dipole is anything (e.g. a molecule, or a part of a molecule), that has a non-zero dipole moment. And a polar molecule is one that has at least local dipoles. CO2 is polar if you get close (i.e. in a condensed phase). From a slightly ...

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I’m confused as to whether both terms “dipole” and “dipole moment” are the same or different, does the moment have something to do with the molecular geometry? Yes, in colloquial usage you will hear dipole, dipole moment used interchangeably. I think you will feel better if you use the full name: electric dipole moment. This is what the mother of all ...

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This is a tool to classify molecules with multiple rings. Here is an example from a PhD thesis: So even though you can find six-membered and eight-membered rings in this structure, these are made up of multiple four-membered rings, and are thus not parts of the set of rings. As the picture illustrates, it is sufficient to choose five rings to show the ...

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Beside the resources for learning chemistry Poutnik indicated, you may learn some of the chemical names and concepts from wikipedia, too. Frequently, articles are available in more than one language and sometimes a version in an other language offers additional details, too. You find the switch at the left side of the pages: Typically, you find some ...

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According to the Oxford dictionary, a machine is: An apparatus using mechanical power and having several parts, each with a definite function and together performing a particular task. Based on that definition, I think some proteins and enzymes could definitely be considered machines. A good example for that, in my opinion, would be ATP Synthase and all ...

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The term "normality" stems from the older German term for equivalent concentration (die Äquivalentkonzentration), namely die Normalität, which was coined by Karl Friedrich Mohr. According to German Wikipedia which also refers to Straube's Der historische Weg der Chemie [1, p. 220], Mohr introduced the concept of normal solution and normality (as it's known ...

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