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Chemistry sets may have been the first American toys marketed toward parents with the goal of "improving" children for success in later life. [10] Gilbert Lab Technician Set for Girls, 1958, at the Science History Institute Johnny Horizon Environmental Test Kit, 1971, at the Science History Institute. The target market for chemistry sets was ...
If an atom, A, is double-bonded to another atom, then atom A should be treated as though it is "connected to the same atom twice". [11] An atom that is double-bonded has a higher priority than an atom that is single bonded. [11] When dealing with double bonded priority groups, one is allowed to visit the same atom twice as one creates an arc. [12]
Chemical Agent Identification Sets (CAIS), known by several other names, were sets of glass vials or bottles that contained small amounts of chemical agents. They were employed by all branches of the United States Armed Forces from 1928-1969 for the purpose of training in detection, handling and familiarization with chemical warfare .
Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.
In chemistry and spectroscopy, ℓ = 0 is called s orbital, ℓ = 1, p orbital, ℓ = 2, d orbital, and ℓ = 3, f orbital. The value of ℓ ranges from 0 to n − 1 , so the first p orbital ( ℓ = 1 ) appears in the second electron shell ( n = 2 ), the first d orbital ( ℓ = 2 ) appears in the third shell ( n = 3 ), and so on: [ 13 ]
The 1,3-dipolar cycloaddition is a chemical reaction between a 1,3-dipole and a dipolarophile to form a five-membered ring. The earliest 1,3-dipolar cycloadditions were described in the late 19th century to the early 20th century, following the discovery of 1,3-dipoles.
[10] [11] Exopolysaccharides are widely used in the food industry as thickeners and gelling additives, which improve food quality and texture. [ 12 ] Currently, exopolysaccharides have received much attention for their antibacterial , anti-oxidative, and anticancer properties, which lead to the development of promising pharmaceutical candidates.
Chulmleigh College, Devon is a coeducational comprehensive secondary school with academy status.. A comprehensive school is a secondary school for pupils aged 11–16 or 11–18, that does not select its intake on the basis of academic achievement or aptitude, in contrast to a selective school system where admission is restricted on the basis of selection criteria, usually academic performance.