constant”λ, a parameter that expresses the probability of decay per unit of time. A more intuitive view of the decay process is the amount of time required for the decaying isotope to reduce to one half of its initial abundance. This is called the half-life and denoted by the symbolt1...
Each of the chemical elements is designated by a simple symbol, for example, carbon, C, copper, Cu, chlorine, Cl, sodium, Na. When a compound occurs between elements the compound can be symbolised by a formula indicating the elemental constituents as for common salt, sodium chloride, NaCl....
Formaldehyde is a colorless, flammable gas or liquid that has a pungent, suffocating odor. It is a volatile organic compound, which is an organic compound that easily becomes a vapor or gas. It is also naturally produced in small, harmless amounts in the human body. The chemical symbol for...
Each atom with a ring closure is assigned an ID number in square brackets (e.g., “[1]”), and subsequent connections to a previously defined ring closure atom are specified with a commercial at symbol, e.g., “@1”. In addition, square brackets are also used to specify properties ...
This method works only with active halides such as allylic, benzylic, and propargillic, but primary and secondaty halides may be alkylated if the enamine is first transformed into a salt. Regioselectivity: The last problem is whether the desired side of an unsymmetric ketone may be alkylated ...
Chemical symbol, short notation derived from the scientific name of a chemical element—e.g., S for sulfur and Si for silicon. Sometimes the symbol is derived from the Latin name—e.g., Au for aurum, gold, and Na for natrium, sodium. The present chemical
If, for example, a soluble silver salt is added to a solution of cyanide that contains a trace of iodide, the solution remains clear until all the cyanide has reacted to form the soluble silver cyanide complex ion. Upon the addition of more silver, the solution becomes turbid because ...
Figure 2: Lewis dot structures for the elements in the first two periods of the periodic table. The structures are written as the element symbol surrounded by dots that represent the valence electrons. Lewis also championed the idea of ‘octets’ (groups of eight), that a filled valence shel...
The oldest known chemical identifiers are words of natural languages describing common chemicals with terms like "water", "iron" or "table salt"; they are trivial names, in modern nomenclature. Notably, trivial names exemplify the principle that a chemical identifier is not necessarily related to ...
anion (symbol and charge) c. formula What is the formula for the salt that forms? \\ HNO_3(aq) + Ba(OH)_2(aq) \rightarrow\ ? What is the correct formula for sodium chlorite? a. NaCl b. NaClO c. NaClO2 d. NaClO4 Give the name or formula of a reagent other than sodium metal...