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𡗶 地 坦 舉 拮 存 群 子 𡥵 孫 𡥙 六 𦒹 三 𠀧 天 地 舉 存 子 孫 六 三 𡗶 坦 拮 群 𡥵 𡥙 𦒹 𠀧 thiên trời địa đất cử cất tồn còn tử con tôn cháu lục sáu tam ba thiên địa cử tồn tử tôn lục tam trời đất cất còn con cháu sáu ba In comparison, comprehensive translations such as the one found in Lễ ký đại ...
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, the term chemically inert is used to describe a substance that is not chemically reactive.From a thermodynamic perspective, a substance is inert, or nonlabile, if it is thermodynamically unstable (positive standard Gibbs free energy of formation) yet decomposes at a slow, or negligible rate.
Perfluoro(2-methyl-3-pentanone) is a fluorinated ketone with the structural formula CF 3 CF 2 C(=O)CF(CF 3) 2, a fully-fluorinated analog of ethyl isopropyl ketone.It is used as an electronics coolant liquid and fire protection fluid sold commercially by 3M under brand names such as Novec 1230, Novec 649, and FK-5-1-12.
Students who are enrolled in general chemistry often desire to become doctors, researchers, and educators. Because of the demands of these fields, professors believe that the level of rigor that is associated with general chemistry should be elevated from that of a typical introductory course.
A chemist (from Greek chēm(ía) alchemy; replacing chymist from Medieval Latin alchemist) [1] is a graduated scientist trained in the study of chemistry, or an officially enrolled student in the field.
Biochemistry, or biological chemistry, is the study of chemical processes within and relating to living organisms. [1] A sub-discipline of both chemistry and biology, biochemistry may be divided into three fields: structural biology, enzymology, and metabolism.
In environmental chemistry, the chemical oxygen demand (COD) is an indicative measure of the amount of oxygen that can be consumed by reactions in a measured solution.It is commonly expressed in mass of oxygen consumed over volume of solution, which in SI units is milligrams per liter (mg/L).