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Sentences for "compounds "
Synthesizing organic compounds in chemistry is very qualitative because purity is of prime importance.
Chemical compounds which are not stable can be very dangerous.
-Meat extract thus prepared is acid in its reaction, owing to the presence of acid phosphates of potassium and sodium, weak acids of the glycolic series, and organic compounds in which the acid character predominates.
Our sun is not of prakriti, but of static ether, composed of the separate and individual elementary substances of the ether, and their compounds vibrating in the lower notes of their octaves.
The nitrogenous end-products and aromatic compounds are urea, uric and hippuric acids, benzoic acid and ethereal sulfates of phenol and cresol.
The compounds which these five elements form with each other are[Pg 12] most complex and varied, and they also admit to combination-but in smaller proportions-some of the other elements, of which phosphorus, potassium, calcium, magnesium, and iron are the most important.
”[4] It is clear if organic bodies were built up of chemical compounds of small complexity and great stability that this continuous range of chemical reactions, this unceasing metabolism, could not take place.
It is therefore a necessary condition for organic substances that they should be built up of chemical compounds that are most complex and unstable.
”[5] To sum up: the living organism, whether it be a simple cell, or the ordered community of cells making up the perfect plant or animal, is an entity, a living individual, wherein highly complex and unstable compounds are unceasingly undergoing chemical reactions, a metabolism essentially associated with protoplasm.
But these complex compounds are, nevertheless, formed by the combinations of but a few of the elements now known to us.
This being so, it is reasonable to infer that if organic life exists elsewhere than on this Earth, its essential feature, there as here, is the [Pg 39]metabolism of nitrogenous carbon compounds in association with protoplasm.
But it is objected that “we are not yet able to identify all the lines in solar or stellar spectra; may not some of these lines be due to elements of which we know nothing here, and may not such new elements form complex and unstable compounds with each other, or with some of those familiar to us, that would take the place of the five organo-generators, and so give rise to a physical basis of life, different from that we know on this Earth?
The Law as given in Mendeléeff’s own words, runs: “The properties of the elements as well as the forms and properties of their compounds are in periodic dependence on, or (expressing ourselves algebraically) form a periodic function of the atomic weights of the elements.
We are no longer at liberty, as we might have been many years ago, to call into fancied existence new elements having no relation in their properties and compounds to those with which we are acquainted.
This new vehicle must, like water, be both neutral and stable, or it would itself interfere with the highly unstable compounds that are a necessity for metabolism.
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