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Overview

chemical combination

The combination of elements to give compounds. There are three laws of chemical combination. (1) The law of constant composition states that the proportions of the elements in a compound ...

chemical combination

chemical combination   Quick reference

A Dictionary of Chemistry (8 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Science and technology, Chemistry
Length:
267 words

... combination The combination of elements to give compounds. There are three laws of chemical combination. (1) The law of constant composition states that the proportions of the elements in a compound are always the same, no matter how the compound is made. It is also called the law of constant proportions or definite proportions . (2) The law of multiple proportions states that when two elements A and B combine to form more than one compound, then the masses of B that combine with a fixed mass of A are in simple ratio to one another. For example,...

chemical combination

chemical combination  

The combination of elements to give compounds. There are three laws of chemical combination. (1) The law of constant composition states that the proportions of the elements in a compound are always ...
Prints

Prints   Reference library

An Oxford Companion to the Romantic Age

Reference type:
Subject Reference
Current Version:
2009
Subject:
History, modern history (1700 to 1945), Literature
Length:
4,058 words
Publisher:
Oxford University Press

...Wedgwood on porcelain supports for his paintings, produced prints of a fine-grained texture based on the free use of stipple and engraving tools. William Blake, though trained as a line-engraver, was perhaps the most far-reaching innovator of all. His main achievement was the combination of image and text on the same plate, while at the same time controlling all the processes within his workroom. He developed a process which he called, probably with reference to medieval manuscripts, ‘Illuminated Printing’. This was, strictly speaking, a form of relief etching,...

11 The Technologies of Print

11 The Technologies of Print   Reference library

James Mosley

The Oxford Companion to the Book

Reference type:
Subject Reference
Current Version:
2010
Subject:
History, Social sciences
Length:
10,250 words
Publisher:
Oxford University Press
Illustration(s):
8

...as *maps , reproductions of paintings, and satirical *prints . During the 17 th and 18 th centuries, however, intaglio prints became widely used for illustrations in books, as well as for adding ornaments and decorative initials to sheets already printed from type. The combination of intaglio and letterpress called for coordination between two different kinds of printer, because the *letterpress printer appears rarely to have had the means to print from plates. 3.3 Preserving and duplicating the text During the hand press period, type was commonly set...

In the Beginning: The Earliest History

In the Beginning: The Earliest History   Reference library

Michael D. Coogan

Oxford History of the Biblical World

Reference type:
Subject Reference
Current Version:
2022
Subject:
Religion
Length:
10,305 words
Publisher:
Oxford University Press
Illustration(s):
2

... In Sumer, as subsequently in its successors Babylonia and Assyria, the principal medium of writing was clay. Before the moistened clay had fully hardened, the symbols were inscribed on it with the sharpened point of a reed, resulting in wedge shapes; each wedge or combination of wedges represented a symbol or syllable. The tablets were then fired, like pottery, becoming essentially indestructible. The great majority of texts recovered that use this wedge-shaped, or cuneiform, writing are on clay tablets, but it was adapted for other media, such as...

chemical antagonism

chemical antagonism  

Antagonism resulting from the chemical combination of an antagonist with the substance being antagonized.
Brent Spar

Brent Spar  

Reference type:
Overview Page
Name of the redundant oil installation which Shell UK in 1995 planned for deep sea disposal; Greenpeace activists, claiming that toxic chemicals from the installation would damage the deep sea ...
ecological land type

ecological land type  

A North American term for an area of land that has a distinct combination of natural, physical, chemical, and biological properties, which cause it to respond in a predictable way to particular ...
interhalogen

interhalogen  

A chemical compound formed between two halogens. Interhalogens are highly reactive and volatile, made by direct combination of the elements. They include compounds with two atoms (C1F, IBr, etc.), ...
chelate

chelate  

The combination of nutrients in a form that is easy for plants to absorb, chemically bound to a carbon‐based substance.
LCAO

LCAO  

(linear combination of atomic orbitals)A molecular orbital formed by the linear combination of atomic orbitals. The LCAO approximation arises because with an electron that is very close to a nucleus, ...
integrated vector management

integrated vector management  

(IVM)A set of evidence-based, decision-making procedures for the planning, delivery, and evaluation of sustainable combinations of vector control measures with a measurable impact on transmission ...
association

association  

The combination of molecules of one substance with those of another to form chemical species that are held together by forces weaker than normal chemical bonds. For example, ethanol and water form a ...
getter

getter  

A substance used to remove small amounts of other substances from a system by chemical combination. For example, a metal such as magnesium may be used to remove the last traces of air when achieving ...
gulf

gulf  

Reference type:
Overview Page
Gulf War the war of January and February 1991 in which an international coalition of forces assembled in Saudi Arabia under the auspices of the United Nations forced the withdrawal of Saddam ...
boride

boride  

A compound of boron with a metal. Most metals form at least one boride of the type MB, MB2, MB4, MB6, or MB12. The compounds have a variety of structures; in particular, the hexaborides contain ...
Dalton's atomic theory

Dalton's atomic theory  

A theory of chemical combination, first stated by John Dalton in 1803. It involves the following postulates:(1) Elements consist of indivisible small particles (atoms).(2) All atoms of the same ...
maximum allowable concentration

maximum allowable concentration  

(MAC)One of several ways to display the criteria of safe levels of exposure to a hazardous or toxic process, chemical, etc., that can be used to establish the acceptability of working conditions. ...
compound

compound  

A substance formed by the combination of elements in fixed proportions. The formation of a compound involves a chemical reaction; i.e. there is a change in the configuration of the valence electrons ...
haemin

haemin  

Reference type:
Overview Page
(heem-in)a chemical derivative of haemoglobin formed by removal of the protein part of the molecule, oxidation of the iron atom, and combination with an acid to form a salt. Compare haematin.

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