The chemical formula of a compound is a symbolic representation of its chemical composition. Chemical formulae provide insight into the elements that constitute the molecules of a compound and also the ratio in which the atoms of these elements combine to form such molecules. For example, the ...
(ˈkɛm ɪ kəl) n. 1.a substance produced by or used in chemistry. 2.chemicals,Slang.narcotic or mind-altering drugs or substances. adj. 3.of, used in, produced by, or concerned with chemistry or chemicals:a chemical formula. ...
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The compound's formula must therefore indicate one Mg2+ cation and two Br- anions. The symbol for the cation is written first. Ions combined: Mg2+, Br-, Br- Chemical formula: MgBr2 Note that the 2 in Br2 is written as a subscript. The charges of the ions are not included in the...
摘要: Compounds of the formula (I): (I) and bioprecursors and pharmaceutically acceptable salts thereof are described as .beta.3-adrenoceptor agonists having anti-obesity, hypoglycaemic and related therapeutic utilities. Processes for their preparation are described as are compositions containing them....
化学分子式(Chemical formula) 化学分子式(Chemical formula) By category Sulfates 1. goslarite: ZnSO4 7H2O? 2. barium meal, barite: BaSO4 3. melanterite, melanterite, melanterite: FeSO4 7H2O? 4. mirabilite, nitre, mirabilite: Na2SO4 10H2O? 5. alum: KAl (SO4) 2? 12H2O 6. raw ...
The molecular formula of compound1was determined to be C15H22O3by the HREIMS atm/z250.1579 [M]+(calcd. 250.1569), indicating five degrees of unsaturation. The13C NMR and DEPT spectroscopic data exhibited 15 carbon signals for three methyls atδC26.8 (q), 27.6 (q), 21.4 (q), four me...
K+ same configuration as [Ar] Br- same configuration as [Kr] * Formation of Ionic Compounds Write the Lewis dot formula representation for the reaction of K and Br. * Formation of Ionic Compounds There is a general trend ...
Reduction and oxidation occur together in redox reactions. K.2 Oxidation Numbers The loss or gain of electrons is easy to identify for monatomic ions, because the charges of the species are easy to monitor. Thus, when Br 2 ions are converted into bromine atoms (which go on to form Br 2...
Moreover, if polishing starts under such initial polishing conditions that the shape of both surfaces are expressed in a mathematical formula, the relationship between the behaviors of both surfaces and pressure distributions can be obtained with the following assumptions: 1. The abrasives and machined...