Search results
Results From The WOW.Com Content Network
Thegn. Ivory seal of Godwin, an unknown thegn – first half of eleventh century, British Museum. In later Anglo-Saxon England, a thegn ( pronounced / θeɪn /; Old English: þeġn) or thane[ 1] (or thayn in Shakespearean English) was an aristocrat who owned substantial land in one or more counties. Thanes ranked at the third level in lay ...
Mary Engle Pennington (1872–1952), American chemist. Agnes Pockels (1862–1935), German chemist. Anna Sundström (1785–1871), Swedish chemist. Clara Immerwahr (1870–1915), First woman to get her doctorate in chemistry in Germany. Ellen Swallow Richards (1842–1911), American industrial and environmental chemist.
Chemistry. The 1871 periodic table constructed by Dmitri Mendeleev. The periodic table is one of the most potent icons in science, lying at the core of chemistry and embodying the most fundamental principles of the field. The history of chemistry represents a time span from ancient history to the present.
Chemical nomenclature. Chemical nomenclature is a set of rules to generate systematic names for chemical compounds. The nomenclature used most frequently worldwide is the one created and developed by the International Union of Pure and Applied Chemistry (IUPAC). IUPAC Nomenclature ensures that each compound (and its various isomers) have only ...
Category. v. t. e. Organic chemistry is a subdiscipline within chemistry involving the scientific study of the structure, properties, and reactions of organic compounds and organic materials, i.e., matter in its various forms that contain carbon atoms. [ 1] Study of structure determines their structural formula.
The history of the periodic table is also a history of the discovery of the chemical elements. The first person in recorded history to discover a new element was Hennig Brand, a bankrupt German merchant. Brand tried to discover the philosopher's stone —a mythical object that was supposed to turn inexpensive base metals into gold.
Chirality (chemistry) Two enantiomers of a generic amino acid that are chiral. ( S )-Alanine (left) and ( R )-alanine (right) in zwitterionic form at neutral pH. In chemistry, a molecule or ion is called chiral ( / ˈkaɪrəl /) if it cannot be superposed on its mirror image by any combination of rotations, translations, and some conformational ...
Physical chemistry involves the use of infinitesimal calculus in deriving equations. It is usually associated with quantum chemistry and theoretical chemistry. Physical chemistry is a distinct discipline from chemical physics, but again, there is very strong overlap. Chemical kinetics – study of rates of chemical processes.