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An oligomer consisting of two monomers joined by chemical bonds that may variably be strong or weak, covalent or intermolecular. A homodimer consists of two identical molecules; a heterodimer consists of two different molecules. dipolar bond. Also coordinate covalent bond, coordinate bond, dative bond, and semipolar bond.
Primarily denotes one hundred years, but occasionally used, especially in the context of competitive racing, to refer to something consisting of one hundred, as in a 100-mile race. Dozen: 12 A collection of twelve things or units from Old French dozaine "a dozen, a number of twelve" in various usages, from doze (12c.) [2] Baker's dozen: 13
A molecule consisting of atoms of only one element is therefore not a compound. A compound can be transformed into a different substance by a chemical reaction, which may involve interactions with other substances. In this process, bonds between atoms may be broken or new bonds formed or both.
Colors of a single chemical in different solvents, under visible and UV light, showing how the chemical interacts dynamically with its solvent environmentIn addition to the generic definition offered above, there are several niche fields where the term "chemical substance" may take alternate usages that are widely accepted, some of which are outlined in the sections below.
lower of two floors that are each at a different ground level due to sloping terrain (UK: lower ground floor) guard the official in charge of a railway train (US & now UK also: conductor) to watch over for security one who guards a protective device. one of two positions in basketball, usually players who are the best ball-handlers and shooters ...
The meaning of the compound may be similar to or different from the meaning of its components in isolation. The component stems of a compound may be of the same part of speech —as in the case of the English word footpath , composed of the two nouns foot and path —or they may belong to different parts of speech, as in the case of the English ...
At that time the term polymer, as introduced by Berzelius in 1832, had a different meaning from that of today: it simply was another form of isomerism for example with benzene and acetylene and had little to do with size. [6] Usage of the term to describe large molecules varies among the disciplines.
Short compounds may be written in three different forms, which do not correspond to different pronunciations, though: The spaced or open form [6] usually consisting of newer combinations or longer words, [7] such as "distance learning", "player piano", "ice cream". [8] The hyphenated form in which two or more words are connected by a hyphen ...