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Az se zanimavam v kachestvoto si na mlad pensioner, zashtoto se pensionirah
na 29 kato me vze myja mi - ot grajdanskoto i hop, napravo v pensia
Hobi mi e da se rovia v PubMed Nikakvo PHD ne mi triabva, ne myrdam
ot moia stol i ot kuhniata, az sym pensioner chovek, neka mladite da se uchat i da se
razvivat Az imam mnogo skromna cel tazi zima - iskam da usvoia materiala
po himia za 9-ti klas. Postavila sym si srok da go napravia za edna godina
Tova e zashtoto ne iskam da se izlagam - sledvashtata svekyrva moje da e dete
na goliamata himia i iskam da sym na nivo
Sledvashtia /potencialen svekyr, dali sha moga da go nadsmiatam, triabva da
proveria, sha si organizirame olimpiadi
Vij za sledvashtiat mi/ potencialen syprug znam, che moga da go nadmina po
rovene v Internet, slushane na muzika, no po sreshtane s priateli ... ne znam
Vsichko e v rycete na myja mi - dyrji klyucha kym vsichki potenciali i vyzmojnosti,
a te ne sa malko ...
Sega kato pensionerka v kuhniata, siakash hich ne mi e mnogo zle, no tova zavisi
izcialo ot lyubovta, blagovolenieto, zdraveto i bydeshteto na myja mi, a az si
predstaviam druga jena v negovoto bydeshte, zashtoto vijdam che lyubovta i
blagovolenieto mu namaliavat s vseki izminal den, i sys vseki izminal den az
obryshtam glava nazad i spomenite mi letiat kym vsichki nedovyrsheni,
neizkonsumirani, nerealizirani lyubovi ...
Ebru Gundes - Seni Seviyorum -
Statisticheski poglednato ima goliama veroiatnost bydeshtata mi svekyrva da e
dete na gioliamata himia, zashtoto az izrastnah igraeiki si s epruvetki, a ne s
kukli Sreda! Huliganska sreda pylna s epruvetki
Niamashe "cherveni shapchici" pri mene, a tuhli po neorganichna himia i v kyshti
mnogo chesto se chuvaha edni duumichki, koito i do den dneshen, ne sa mi
syvsem iasni - polimeri, izomeri, fenoli!
Polymer
From Wikipedia, the free encyclopedia
Appearance of real linear polymer chains as recorded using an atomic force microscope on surface under liquid medium. Chain contour length for this polymer is ~204 nm; thickness is ~0.4 nm.[1]
A polymer is a large molecule (macromolecule) composed of repeating structural units. These sub-units are typically connected by covalent chemical bonds. Although the term polymer is sometimes taken to refer to plastics, it actually encompasses a large class of compounds comprising both natural and synthetic materials with a wide variety of properties.
Because of the extraordinary range of properties of polymeric materials,[2] they play an essential and ubiquitous role in everyday life.[3] This role ranges from familiar synthetic plastics and elastomers to natural biopolymers such as nucleic acids and proteins that are essential for life.
Natural polymeric materials such as shellac, amber, wool, silk and natural rubber have been used for centuries. A variety of other natural polymers exist, such as cellulose, which is the main constituent of wood and paper. The list of synthetic polymers includes synthetic rubber, Bakelite, neoprene, nylon, PVC, polystyrene, polyethylene, polypropylene, polyacrylonitrile, PVB, silicone, and many more.
Most commonly, the continuously linked backbone of a polymer used for the preparation of plastics consists mainly of carbon atoms. A simple example is polyethylene ('polythene' in British English), whose repeating unit is based on ethylene monomer. However, other structures do exist; for example, elements such as silicon form familiar materials such as silicones, examples being Silly Putty and waterproof plumbing sealant. Oxygen is also commonly present in polymer backbones, such as those of polyethylene glycol, polysaccharides (in glycosidic bonds), and DNA (in phosphodiester bonds).
Polymers are studied in the fields of polymer chemistry, polymer physics, and polymer science.
Isomer
From Wikipedia, the free encyclopedia
This article is about the chemical concept. For "isomerism" of atomic nuclei, see nuclear isomer.
In chemistry, isomers ( isos = "equal", meros = "part") are compounds with the same molecular formula but different structural formulas.[1] Isomers do not necessarily share similar properties, unless they also have the same functional groups. There are many different classes of isomers, like stereoisomers, enantiomers, geometrical isomers, etc. (see chart below). There are two main forms of isomerism: structural isomerism and stereoisomerism (spatial isomerism).
Isomerisation is the process by which one molecule is transformed into another molecule which has exactly the same atoms, but the atoms are rearranged[5]. In some molecules and under some conditions, isomerisation occurs spontaneously. Many isomers are equal or roughly equal in bond energy, and so exist in roughly equal amounts, provided that they can interconvert relatively freely, that is the energy barrier between the two isomers is not too high. When the isomerisation occurs intramolecularly it is considered a rearrangement reaction.
Phenol
Phenol, also known as carbolic acid and phenic acid, is an organic compound with the chemical formula C6H5OH. It is a white crystalline solid at room temperature. The molecule consists of a phenyl group (-C6H5) bonded to a hydroxyl group (-OH). It is mildly acidic, but requires careful handling due to its propensity to cause burns.
Phenol was first extracted from coal tar, but today is produced on a large scale (about 7 billion kg/year) using a series of industrial processes starting with crude oil. It is an important industrial commodity as a precursor to many materials and useful compounds.[4] Its major uses involve its conversion to plastics or related materials. Phenol and its chemical derivatives are key for building polycarbonates, epoxies, Bakelite, nylon, detergents, herbicides such as phenoxy herbicides, and a large collection of pharmaceutical drugs.
Elvis Presley - Don't be cruel
Baby, if I made you mad
For something I might have said,
Please, let's forget the past,
The future looks bright ahead,
Don't be cruel to a heart that's true.
I don't want no other love,
Baby it's just you I'm thinking of.
Редактирано от dorka14 на 29.08.12 22:44.
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Re: дорка sloji DTaP dnes :) [re: izz]
