The chemical substance that is used to make glass is ___. A. silica B. calcium carbonate C. sodium carbonate D. magnesium oxide 相关知识点: 试题来源: 解析 A。制造玻璃的化学物质是二氧化硅,即 silica。选项 B 是碳酸钙,选项 C 是碳酸钠,选项 D 是氧化镁。所以答案是 silica。反馈...
The sinkage silica product is suitable although it uses for the tooth polishing medicine which includes especially chloridation sechirupirijiniumu. And, significant level cannot come in contact with the surface area silica product low, this way it can continue to utilize in anti-bacterial action. ...
chemical compound,compound- (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight silicone,silicone polymer- any of a large class of siloxanes that are unusually stable over a wide range of temperatures; used in lubricants and adhe...
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Ease of processing of wood is affected by density, occurrence of reaction wood and in some species the presence of silica (especially tropical hardwoods). In general, softwoods are easier to process than hardwoods, which is a major factor affecting the speed at which the cladding boards are pr...
Imaging of humic substance macromolecular structures in water and soils. Science 286, 1335–1337 (1999). Google Scholar Denton, J. K. et al. Molecular-level origin of the carboxylate head group response to divalent metal ion complexation at the air–water interface. Proc. Natl Acad. Sci. ...
Researchers in Russia report the discovery of one such creation - an unusual mineral never before documented by scientists: an alluring, vibrantly blue-and-green crystallized substance the team have called petrovite. Volcanic eruptions have more effect in summer PhysOrg - November 18, 2020 Detailed...
Chemical tracers are used to measure the concentration of a chemical substance in a fluid, while physical tracers are used to measure temperature. Active tracers change the flow of the fluid dynamically by changing fluid parameters that appear in the equation of motion, such as density or ...
Venoms are generally seen as a source of death; however, scientifically venom is a complex biochemical substance having a specific pharmacologic action which can also be used as agents to cure a variety of diseases in humans. Venom peptides along with nanoparticles can evolve as the new era for...
Solubility was measured at room temperature by slurrying the solid drug substance in deionized water and pH buffers for 48 h, passing the slurry through a 0.2 µm filter, and analyzing the filtrate using LC-UV spectrometry. Solution state NMR was used to measure the chemical shift of...