Dictionary of Chemistry [6th Ed.]
in a vacuum, would produce a force between the conductors of 2 × 10 –7 Nm–1. This deÜnition replaced the earlier international a ...
synthesis of anabolic precursors for amino-acid synthesis. amphiphilicDescribing a molecule that has both hydrophilic and hy- dr ...
contaminants for use in chemical analyses. analyserA device, used in the *po- larization of light, that is placed in the eyepiec ...
angstrom Symbol Å. A unit of length equal to 10–10metre. It was formerly used to measure wave- lengths and intermolecular distan ...
animal charcoal See charcoal. animal starch See glycogen. anionA negatively charged *ion, i.e. an ion that is attracted to the * ...
linked by alternating single and dou- ble bonds. Such compounds have even numbers of carbon atoms. Cyclo-octatetraene, C 8 H 8 , ...
anthocyaninOne of a group of *Ûavonoid pigments. Anthocyanins occur in various plant organs and are responsible for many of the ...
engines to lower its freezing point so that it does not solidify at sub-zero temperatures. The commonest an- tifreeze is *ethane ...
ciated with anti-Stokes radiation are called anti-Stokes lines. The quantum theory of the Raman effect provides an explanation f ...
ence of impurities may tint it grey, blue, green, or pink. arene complex A complex in which an aromatic ring is bound to a metal ...
electrolytes conduct because of the presence of ions. He also worked on kinetics and proposed the *Arrhe- nius equation. He was ...
white amorphous deliquescent solid, As 2 O 5 ; r.d. 4.32; decomposes at 315 °C. It is soluble in water and ethanol. Arsenic(V) o ...
asphaltBitumen. See petroleum. aspirin(acetylsalicylic acid)an acetylated form of *salicylic acid (1- hydroxybenzoic acid), used ...
chemistry is the way in which these molecules are formed and the way in which they interact with clouds of interstellar dust. A ...
each subshell is written as a super- script numeral to the subshell sym- bol, and the maximum number of electrons in each subshe ...
atomic mass of an element divided by its density. atomic weightSee relative atomic mass. atom-probe Üeld-ion micros- copyA techn ...
adsorbed atom is removed as an ion by a pulse of potential difference. The atom then passes in the same di- rection as the gas i ...
and absorption occurs only in the surface layer. ATRS is used in foren- sic science for analysis of thin layers (e.g. paint). at ...
number of applications, particularly in the study of living tissues and cells. auxochrome A group in a dye mol- ecule that inÛue ...
mum point is reached, at which the two liquids distil together without change in composition. The composi- tion of an azeotrope ...
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