Best 313 quotes in «chemistry quotes» category

I am now convinced that we have recently become possessed of experimental evidence of the discrete or grained nature of matter, which the atomic hypothesis sought in vain for hundreds and thousands of years. The isolation and counting of gaseous ions, on the one hand, which have crowned with success the long and brilliant researches of J.J. Thomson, and, on the other, agreement of the Brownian movement with the requirements of the kinetic hypothesis, established by many investigators and most conclusively by J. Perrin, justify the most cautious scientist in now speaking of the experimental proof of the atomic nature of matter, The atomic hypothesis is thus raised to the position of a scientifically well-founded theory, and can claim a place in a text-book intended for use as an introduction to the present state of our knowledge of General Chemistry.

I call supplementing with electrolytes and metals: The Electrical Chemistry of the Human

I dashed to the library at the first opportunity; I refer to the venerable library of the University of Turin's Chemical Institute, at that time, like Mecca, impenetrable to infidels and even hard to penetrate for such faithful as I. One had to think that the administration followed the wise principle according to which it is good to discourage the arts and sciences: only someone impelled by absolute necessity, or by an overwhelming passion, would willingly subject himself to the trials of abnegation that were demanded of him in order to consult the volumes. The library's schedule was brief and irrational, the lighting dim, the file cards in disorder; in the winter, no heat; no chairs but uncomfortable and noisy metal stools; and finally, the librarian was an incompetent, insolent boor of exceeding ugliness.

I get so breathless, when you call my name, I've often wondered, do you feel the same? There's a chemistry, energy, a synchronicity When we're all alone.

If the elements are the alphabets of chemistry, then the compounds are its plays, its poems, and its novels.

If these d'Herelle bodies were really genes, fundamentally like our chromosome genes, they would give us an utterly new angle from which to attack the gene problem. They are filterable, to some extent isolable, can be handled in test-tubes, and their properties, as shown by their effects on the bacteria, can then be studied after treatment. It would be very rash to call these bodies genes, and yet at present we must confess that there is no distinction known between the genes and them. Hence we can not categorically deny that perhaps we may be able to grind genes in a mortar and cook them in a beaker after all. Must we geneticists become bacteriologists, physiological chemists and physicists, simultaneously with being zoologists and botanists? Let us hope so.

If you go very deeper you will see that you are not in freedom you are in cage made by chemistry and science.

If you want to become a chemist, you will have to ruin your health. If you don't ruin your health studying, you won't accomplish anything these days in chemistry. {Liebig's advice to August Kekulé.}

I got into magic because I got into alchemy. Which I got into because I was into chemistry, which I was learning about because I wanted to get better with botany, which I had taken up studying in an effort to grow some killer weed

I had once repeated the experiment to reassure myself that this was so, and it was. Ashes to ashes; starch to sugar. A little window into the Creation

I know of enough cases in which a close and, as it seemed, indissoluble relationship was annulled by the casual arrival of a third party, and one of the pair, previously joined so beautifully, driven out into empty space.

I have learned over the years that many formally educated corrosion professionals are either engineers or chemists by training. While those two groups represent the largest two categories of backgrounds in the oilfield corrosion control industry, they are in the minority.

I hope that in due time the chemists will justify their proceedings by some large generalisations deduced from the infinity of results which they have collected. For me I am left hopelessly behind and I will acknowledge to you that through my bad memory organic chemistry is to me a sealed book. Some of those here, Hofmann for instance, consider all this however as scaffolding, which will disappear when the structure is built. I hope the structure will be worthy of the labour. I should expect a better and a quicker result from the study of the powers of matter, but then I have a predilection that way and am probably prejudiced in judgment.

I might paraphrase Churchill and say: never have I received so much for so little. [Exemplifying humility, upon accepting the Nobel Prize in Chemistry.]

I looked for it [heavy hydrogen, deuterium] because I thought it should exist. I didn't know it would have industrial applications or be the basic for the most powerful weapon ever known [the nuclear bomb] ... I thought maybe my discovery might have the practical value of, say, neon in neon signs. [He was awarded the 1931 Nobel Prize in Chemistry for discovering deuterium.]

I'll have to jump around like sodium in the rain.

I'm even going to electrolyze my urine. That'll make for a pleasant smell in the trailer. If I survive this, I'll tell people I was pissing rocket fuel.

In modern society, it is not enough to be an engineer, a doctor, a chemist, a biologist, or a physicist, you must be all of them to understand why human health is failing on such a massive scale.

In deriving a body from the water type I intend to express that to this body, considered as an oxide, there corresponds a chloride, a bromide, a sulphide, a nitride, etc., susceptible of double compositions, or resulting from double decompositions, analogous to those presented by hydrochloric acid, hydrobromic acid, sulphuretted hydrogen, ammonia etc., or which give rise to the same compounds. The type is thus the unit of comparison for all the bodies which, like it, are susceptible of similar changes or result from similar changes.

In describing a protein it is now common to distinguish the primary, secondary and tertiary structures. The primary structure is simply the order, or sequence, of the amino-acid residues along the polypeptide chains. This was first determined by [Frederick] Sanger using chemical techniques for the protein insulin, and has since been elucidated for a number of peptides and, in part, for one or two other small proteins. The secondary structure is the type of folding, coiling or puckering adopted by the polypeptide chain: the a-helix structure and the pleated sheet are examples. Secondary structure has been assigned in broad outline to a number of librous proteins such as silk, keratin and collagen; but we are ignorant of the nature of the secondary structure of any globular protein. True, there is suggestive evidence, though as yet no proof, that a-helices occur in globular proteins, to an extent which is difficult to gauge quantitatively in any particular case. The tertiary structure is the way in which the folded or coiled polypeptide chains are disposed to form the protein molecule as a three-dimensional object, in space. The chemical and physical properties of a protein cannot be fully interpreted until all three levels of structure are understood, for these properties depend on the spatial relationships between the amino-acids, and these in turn depend on the tertiary and secondary structures as much as on the primary. Only X-ray diffraction methods seem capable, even in principle, of unravelling the tertiary and secondary structures. [Co-author with G. Bodo, H. M. Dintzis, R. G. Parrish, H. Wyckoff, and D. C. Phillips]

In one department of his [Joseph Black's] lecture he exceeded any I have ever known, the neatness and unvarying success with which all the manipulations of his experiments were performed. His correct eye and steady hand contributed to the one; his admirable precautions, foreseeing and providing for every emergency, secured the other. I have seen him pour boiling water or boiling acid from a vessel that had no spout into a tube, holding it at such a distance as made the stream's diameter small, and so vertical that not a drop was spilt. While he poured he would mention this adaptation of the height to the diameter as a necessary condition of success. I have seen him mix two substances in a receiver into which a gas, as chlorine, had been introduced, the effect of the combustion being perhaps to produce a compound inflammable in its nascent state, and the mixture being effected by drawing some string or wire working through the receiver's sides in an air-tight socket. The long table on which the different processes had been carried on was as clean at the end of the lecture as it had been before the apparatus was planted upon it. Not a drop of liquid, not a grain of dust remained.

In the last four days I have got the (results) given by Tantalum, Chromium, Manganese, Iron , Nickel, Cobalt and Copper ... The chief result is that ... the result for any metal (is) quite easy to guess from the results for the others. This shews that the insides of all the atoms are very much alike, and from these results it will be possible to find out something of what the insides are made up of.

In the vestibule of the Manchester Town Hall are placed two life-sized marble statues facing each other. One of these is that of John Dalton ... the other that of James Prescott Joule. ... Thus the honour is done to Manchester's two greatest sons—to Dalton, the founder of modern Chemistry and of the atomic theory, and the laws of chemical-combining proportions; to Joule, the founder of modern physics and the discoverer of the Law of Conservation of Energy. One gave to the world the final proof ... that in every kind of chemical change no loss of matter occurs; the other proved that in all the varied modes of physical change, no loss of energy takes place.

[Pechblende] einer eigenthümlichen, selbstständigen metallischen Substanz bestehe. Es fallen folglich auch deren bisherige Benennungen, als: Ресhblende Eisenpecherz, hinweg, welche nun durch einen neuen ausschliessend bezeichnenden Namen zu ersetzen sind. Ich habe dazu den Namen: Uranerz (Uranium) erwählt; zu einigem Andenken, dass die chemische Ausfindung dieses neuen Metallkörpers in die Epoche der astronomischen. Entdeckung des Planeten Uranus gefallen sei. [Pitchblende] consists of a peculiar, distinct, metallic substance. Therefore its former denominations, pitch-blende, pitch-iron-ore, &c. are no longer applicable, and must be supplied by another more appropriate name.—I have chosen that of uranite, (Uranium), as a kind of memorial, that the chemical discovery of this new metal happened in the period of the astronomical discovery of the new planet Uranus.

Is there something to the notion "Let me sleep on it."? Mountains of data says there is. For example, Mendeleyev - the creator of the Periodic Table of Elements - says that he came up with this idea in his sleep. Contemplating the nature of the universe while playing Solitaire one evening, he nodded off. When he awoke, he knew how all the atoms in the universe were organised, and he promptly created his famous table. Interestingly, he organised the atoms in repeating groups of seven, just the way you play Solitaire.

I studied calculus for the first time, which to me was an amazingly empowering experience which I could really see how you could understand all sorts of things, and I decided that chemistry and biology just had too much memory for me to be interested. Physics was very easy.

I think it just says a lot about our chemistry! -Dan

it is urgent that my chemical alter ego, so in love with digressions, get back on the rails, which is that of fornicating with matter in order to support myself

I took a glass retort, capable of containing eight ounces of water, and distilled fuming spirit of nitre according to the usual method. In the beginning the acid passed over red, then it became colourless, and lastly again all red: no sooner did this happen, then I took away the receiver; and tied to the mouth of the retort a bladder emptied of air, which I had moistened in its inside with milk of lime lac calcis, (i.e. lime-water, containing more quicklime than water can dissolve) to prevent its being corroded by the acid. Then I continued the distillation, and the bladder gradually expanded. Here-upon I left every thing to cool, tied up the bladder, and took it off from the mouth of the retort.— I filled a ten-ounce glass with this air and put a small burning candle into it; when immediately the candle burnt with a large flame, of so vivid a light that it dazzled the eyes. I mixed one part of this air with three parts of air, wherein fire would not burn; and this mixture afforded air, in every respect familiar to the common sort. Since this air is absolutely necessary for the generation of fire, and makes about one-third of our common air, I shall henceforth, for shortness sake call it empyreal air, [literally fire-air] the air which is unserviceable for the fiery phenomenon, and which makes abut two-thirds of common air, I shall for the future call foul air [literally corrupted air].

It was the colors that had initially attracted her, the vibrant blue of the Bunsen flame and the dusty red of copper and the deep violet of permanganate. It was the logic of balanced equations, the certainty that when element A mixed with element B, compound C would appear. It was like predicting the future; it was like magic. Most of all, it was being: of having to be so careful with the hydrochloric acid, of accidentally burning herself while lighting a match, of discovering.

It was the first time! Just because there weren’t fireworks the first time doesn’t mean there will never be fireworks. We’re human; we’re adults; we teach each other; we communicate; fireworks don’t just go off, wham-bang; fireworks evolve!’ Awestruck by the utter, asinine nonsense of this metaphor, everyone is still. Into the stillness, the ample woman drops the word ‘Wrong.’ Then she says it again. ‘Wrong…I’m talking about science…Pheromones.’ The woman turns to Cornelia. ‘The chemicals in his body call out. The chemicals in your body answer. It either happens or it doesn’t.’ On top of being dumb, Cornelia is dumbfounded.

It would not be out of order to remark here that a chemist's work is never done. Those choosing it asa profession ought to know at the outset that most of their lives will be spent washing up.

I wasn’t aware of just how close he’d moved to me until now. So many details came into focus. The shape of his lips, the line of his neck. “I’m not dangerous,” I breathed. He brought his face toward mine. “You are to me.” And somehow, against all reason, we were kissing. I closed my eyes, and the world around me faded. The noise, the smoke . . . it was gone. All that mattered was the taste of his mouth, a mix of cloves and mints. There was a fierceness in his kiss, a desperation . . . and I answered, just as hungry for him. I didn’t stop him when he pulled me closer, so that I almost sat on his lap. I’d never been wrapped around someone’s body like that, and I was shocked at how eagerly mine responded. His arm went around my waist, pulling me onto him further, and his other hand slid up the back of my neck, getting entangled in my hair. He took his lips away from my mouth, gently trailing kisses down to my neck. I tipped my head back, gasping when the intensity returned to his mouth. There was an animalistic quality that sent shock waves through the rest of my body.

The discovery of an interaction among the four hemes made it obvious that they must be touching, but in science what is obvious is not necessarily true. When the structure of hemoglobin was finally solved, the hemes were found to lie in isolated pockets on the surface of the subunits. Without contact between them how could one of them sense whether the others had combined with oxygen? And how could as heterogeneous a collection of chemical agents as protons, chloride ions, carbon dioxide, and diphosphoglycerate influence the oxygen equilibrium curve in a similar way? It did not seem plausible that any of them could bind directly to the hemes or that all of them could bind at any other common site, although there again it turned out we were wrong. To add to the mystery, none of these agents affected the oxygen equilibrium of myoglobin or of isolated subunits of hemoglobin. We now know that all the cooperative effects disappear if the hemoglobin molecule is merely split in half, but this vital clue was missed. Like Agatha Christie, Nature kept it to the last to make the story more exciting. There are two ways out of an impasse in science: to experiment or to think. By temperament, perhaps, I experimented, whereas Jacques Monod thought.

The dogma of the impossibility of determining the atomic constitution of substances, which until recently was advocated with such fervor by the most able chemists, is beginning to be abandoned and forgotten; and one can predict that the day is not far in the future when a sufficient collection of facts will permit determination of the internal architecture of molecules. A series of experiments directed toward such a goal is the object of this paper.

The first rule of chem lab is to never heat a closed system or it will explode.

The human mind adjusts itself to a certain point of view, and those who have regarded nature from one angle, during a portion of their life, can adopt new ideas only with difficulty.

The Kiss. It seemed like more than a kiss. It felt more like alchemy.

THE MAXIMS OF MEDICINE Before you examine the body of a patient, Be patient to learn his story. For once you learn his story, You will also come to know His body. Before you diagnose any sickness, Make sure there is no sickness in the mind or heart. For the emotions in a man’s moon or sun, Can point to the sickness in Any one of his other parts. Before you treat a man with a condition, Know that not all cures can heal all people. For the chemistry that works on one patient, May not work for the next, Because even medicine has its own Conditions. Before asserting a prognosis on any patient, Always be objective and never subjective. For telling a man that he will win the treasure of life, But then later discovering that he will lose, Will harm him more than by telling him That he may lose, But then he wins. THE MAXIMS OF MEDICINE by Suzy Kassem

In using the present in order to reveal the past, we assume that the forces in the world are essentially the same through all time; for these forces are based on the very nature of matter, and could not have changed. The ocean has always had its waves, and those waves have always acted in the same manner. Running water on the land has ever had the same power of wear and transportation and mathematical value to its force. The laws of chemistry, heat, electricity, and mechanics have been the same through time. The plan of living structures has been fundamentally one, for the whole series belongs to one system, as much almost as the parts of an animal to the one body; and the relations of life to light and heat, and to the atmosphere, have ever been the same as now.

I saw this thing on ITV the other week Said, that if she played with her hair, she's probably keen She's playin' with her hair, well regularly So I reckon I could well be in.

It cannot, of course, be stated with absolute certainty that no elements can combine with argon; but it appears at least improbable that any compounds will be formed. [This held true for a century, until in Aug 2000, the first argon compound was formed, argon fluorohydride, HArF, but stable only below 40 K (−233 °C).]

I think it just says a lot about our chemistry!

It is, of course, extremely toxic, but that’s the least of the problem. It is hypergolic with every known fuel, and so rapidly hypergolic that no ignition delay has ever been measured. It is also hypergolic with such things as cloth, wood, and test engineers, not to mention asbestos, sand, and water-with which it reacts explosively. It can be kept in some of the ordinary structural metals-steel, copper, aluminium, etc.-because of the formation of a thin film of insoluble metal fluoride which protects the bulk of the metal, just as the invisible coat of oxide on aluminium keeps it from burning up in the atmosphere. If, however, this coat is melted or scrubbed off, and has no chance to reform, the operator is confronted with the problem of coping with a metal-fluorine fire. For dealing with this situation, I have always recommended a good pair of running shoes.

It's the in-between, the sustenance, not just the gears and bolts that make a human. When you forget to find out how the person was built—the oil, chemistry, and the craft—you miss all the beauty.

It's weird I don't know anything about you," "What are you talking about? We just spent the whole day together." "Yes, but we drank loads and chatted about - I don't even know what we chatted about," "I like conversations like that," Tom said. "Much less hard work. with my ex, it was like pulling teeth sometimes. We had loads in common but we didn't see the world the same way." He stopped. "Oh, that sounds good. I should write it down." He got out his phone. "You're writing that down?" "Yep" Tom said, fiddling with his phone She stared at him, trying not to laugh. "Wow. You are weird, do you know that," she said. "Most of the time you're almost normal, but occasionally your super-weird side comes out.

I was hoping to be able to get into the Queen's Chamber while I was in Egypt in 1986 to get a sample of the salt for analysis. I had speculated that the salt on the walls of the chamber was an unwanted, though significant, residual substance caused by a chemical reaction where hot hydrogen reacted with the limestone. Unfortunately, I was unable to get into the chamber because a French team was already inside the Horizontal Passage, boring holes into what they hoped were additional chambers. (It was discovered, after I left Egypt, that the spaces contained only sand.) As it turned out, my research would have been redundant. Noone reported in his book that another individual had already had the same idea and done the work. In 1978, Dr. Patrick Flanagan asked the Arizona Bureau of Geology and Mineral Technology to analyze a sample of this salt. They found it to be a mixture of calcium carbonate (limestone), sodium chloride (halite or salt), and calcium sulfate (gypsum, also known as plaster of paris). These are precisely the minerals that would be produced by the reaction of hot, hydrogen-bearing gas with the limestone walls and ceiling of the Queen's Chamber. [...] The interior chambers of the Great Pyramid have the appearance of being subjected to extreme temperatures; and [...] the broken corner on the granite box shows signs of being melted, rather than simply being chipped away.

I woan let you go back to that boy--not until you give me one bec doux." A sweet kiss. Then he reached forward, unlacing the ribbon from my hair. "What are you doing?" I murmured. "Souvenir." He put it in his pocket, and for some reason that struck me as the sexiest thing I'd ever seen.

Look here, I have succeeded at last in fetching some gold from the sun. {After his banker questioned the value of investigating gold in the Fraunhofer lines of the sun and Kirchhoff handing him over a medal he was awarded for his investigations.}

Mapenzi, kama ilivyo kwa vitu vyote hapa ulimwenguni, hayawezi kuwepo bila kujumuishwa na fizikia na kemia yake! Bila kemia hakuna mapenzi ya kudumu. Tamaa ya ngono kimsingi huanza pindi unapokutana na mtu. Tamaa hiyo huweza kukua na kuwa kitu kingine kadiri muda unavyokwenda lakini chanzo kinakuwepo toka siku ya kwanza mlipokutana. Kemikali inayosababisha tamaa ya ngono na hata kuikuza tamaa hiyo ni 'phenyl ethylamine' ('fino itholamine') au PEA ambayo ni kemikali ya mapenzi ndani ya ubongo. Husisimua watu na huongeza nguvu za kimwili (fizikia) na kihisia (kemia). Tamaa husababisha mtu azalishe PEA nyingi zaidi, kitu kinachosababisha kujisikia kizunguzungu (cha hisia za kimapenzi) na dalili zingine kama magoti kutetemeka, jasho kutoka viganjani na kutokutulia. Kemikali hii inapozalishwa kwa kiwango kikubwa, hutuma alamu ('signals') kutoka kwenye ubongo mpaka kwenye viungo vingine vya mwili na kutumika kama 'dopamine' au 'amphetamine' ambazo ni kemikali za ulevi ndani ya ubongo. Iwapo unajiuliza kwa nini wewe au mtu mwingine unavutiwa na mtu ambaye hamwendani kimapenzi, inaweza kuwa ni kwa sababu una kiwango kikubwa cha kemikali hizo kuliko mwenzako, kitu ambacho huzidi uwezo wa kutumia kichwa na kutoa maamuzi bora kulingana na akili ya kuzaliwa. Kwa jumla, mapenzi yote ya kweli uhitaji angalau kiwango kidogo cha PEA kwa wale wanaopendana. Cha msingi kukumbuka ni kwamba kemikali hizi huja kwa vituo, nikiwa simaanishi kwamba tamaa ya ngono hupotea pale mtu anapoelekea kwenye uhusiano wa kudumu. Lakini mambo hubadilika. Hatuwezi kuvumilia zile hisia kali kadiri tunavyozidi kusafiri kuelekea kwenye uhusiano wa kudumu na kwenye maisha ya pamoja yenye furaha. Katika uhusiano wenye afya hata hivyo matatizo hutokea hapa na pale. Chanzo cha Murphy na Debbie kupendana kilikuwa kemia zaidi kuliko fizikia. Kama hakuna kemia hakuna mapenzi.