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Element Name: Hafnium. Hafnium Symbol: Hf. Atomic Number: 72. Atomic Weight: 178.49. Element Classification: Transition Metal. Electron Configuration: [Xe] 4f 14 5d 2 6s 2. Discovery: Dirk Coster and Georg von Hevesy 1923 (Denmark) Name Origin: Hafnia, the Latin name of Copenhagen. Density (g/cc): 13.31.
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Chemical structure: This structure is also available as a 2d Mol file or as a computed 3d SD file The 3d structure may be viewed using Java or Javascript. Isotopologues: [2H]hydrogen fluoride; Permanent link for this species. Use this link for bookmarking this species for future reference. Information on this page: Ion clustering data ...
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Some physical and chemical data of HF that were commonly used and or needed for modeling and data analysis of atmospheric HF are tabulated below in Table 1. Table 1 Properties of HF. ... P.K. (1990) Hydrogen Fluoride and Fluorine Dispersion Models Integration into the Air Force Dispersion Assessment Model (ADAM), final report …
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Hydrogen fluoride is a colorless chemical made of a hydrogen atom and a fluorine atom. When dissolved in water it is called hydrofluoric acid. As much as 60 …
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The acid consists of a diatomic molecule with strong intermolecular hydrogen bonds. The chains in the molecules are usually shorter and exist between five and six molecules on an average. Formula. HF. Molar Mass. 20.006 g·mol−1. Density.
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Hafnium (Hf) chemical structure, technical & safety data, discovery, uses. ... Thought hafnium shares many chemical and physical properties with zirconium, the two metals differ significantly in their densities (hafnium being roughly twice as dense) and their nuclear properties. Hafnium is an excellent neutron absorber with a high thermal ...
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Created by video journalist Brady Haran working with chemists at The University of Nottingham. Element Hafnium (Hf), Group 4, Atomic Number 72, d-block, Mass 178.486. …
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FLUORIDES, HYDROGEN FLUORIDE, AND FLUORINE 190 4. CHEMICAL AND PHYSICAL INFORMATION Table 4-2. Physical and Chemical Properties of Fluorine, Hydrogen Fluoride, Sodium Fluoride, Fluosilicic Acid, and Sodium Silicofluoridea Property Fluorine Hydrogen fluoride Sodium fluoride Molecular weight 37.997 20.006 42.00
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Synonyms: Hydrogen fluoride, fluoric acid, hydrofluoride, fluorine monohydride CAS No: Mol. Formula: HF Mol. Weight: 20.01 ... C. Chemical Properties Hydrofluoric acid etches glass, due to the strong bond formed between fluoride anions and the silicon molecules in glass. HF will also react with glazes, enamels, pottery, concrete, rubber,
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Molecular Formula HF. Average mass 20.006 Da. Monoisotopic mass 20.006227 Da. ChemSpider ID 14214.
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Properties F H H H H H F F F F F H. All statements and information are believed to be accurate and reliable, they are presented without guarantee or warranty of any kind, express or implied. Information ... Hydrogen Fluoride 100 120 140 160 180 200 220 240 260 280 300-50 0 50 100 150 200 250 300 350 400 450 Temperature, oF
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Hydrofluoric Acid | HF or FH | CID 14917 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and …
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Formula and structure: The chemical formula of hydrofluoric acid is HF. Its molar mass is 20.01 g/mol. Hydrogen fluoride is the gaseous form, while hydrofluoric acid is the solution of HF in water. ... Physical properties: Hydrogen fluoride is a colorless gas with a density of 1.15 g/L at room temperature, or a colorless liquid (below 20°C ...
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A different formula for higher vibrational levels (v≤19) was derived by. (v=0,J=1) = 1.82618 D = 0.7410, quadrupole moment Θ = 2.36E-26 esu cm. From photoelectron spectra Walker, Dehmer, et al., 1973 Guyon, Spohr, et al., 1976. Earlier photoionization studies yielded 16.00 Berkowitz, Chupka, et al., 1971, a value strongly affected by the ...
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Hydrofluoric acid (HF) is an aqueous solution of hydrogen fluoride gas. At room temperature, it appears as colorless transparent to light yellow smoke liquid with pungent odor. It has a specific gravity of 0.98 which is slightly lighter than water. It has a boiling point of 19.4 °C, being highly volatile.
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Hydrogen fluoride attacks glass and decomposes it. Hydrofluosilicic acid and metal silicofluoride are formed which are soluble in water. Therefore, glass is slowly eaten up by HF. Thus glass slowly dissolves in HF acid. Hence HF solution is not stored In glass bottles. Na2SiO 3 + 6 HF → Na 2 Si F 6 + 3H 2 O.
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Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Constants of diatomic molecules, References 1. Symbols used in this document: 2. Data from NIST Standard Reference Database 69:NIST Chemistry WebBook 3. The …
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EXHIBIT 2-1 Physical/Chemical Properties of Hydrogen Fluoride Property Anhydrous HF Aqueous HF (70%) Boiling point Melting point Density at 25°C Solubility in water Vapor pressure 19.54°C -83.55°C 0.9576 g/cm3 complete 922 mm Hg at 25°C 66.4°C --„- -69°C 1 .22 g/cm3 complete 150mmHgat25°C Source: Kirk-Othmer Encyclopedia of Chemical ...
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Structure and Chemical Properties. Hydrogen fluoride is formed through covalent bonding (electron sharing) between a hydrogen atom and a fluorine atom. Hydrogen contains one electron, and fluorine ...
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Chemical Properties of Titanium – The Reaction of Titanium with Some Compounds. 1. HF and Fluoride. Hydrogen fluoride gas reacts with titanium to form TiF4 when heated, and the reaction formula is Ti + 4HF = TiF4 + 2H2 + 135.0 kcal. The non-aqueous hydrogen fluoride liquid can form a dense titanium tetrafluoride film on the titanium surface ...
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Discovery of Hafnium. Hafnium's existence was originally predicted by Russian chemist Dmitri Mendeleev. In his 1869 book "The Periodic Law of the Chemical Elements" he predicted the existence of an element with …
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Hafnium is a chemical element with atomic number 72 which means there are 72 protons in its nucleus. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs.
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Hydrogen fluoride is a chemical compound that contains fluorine. It can exist as a colorless gas or as a fuming liquid, or it can be dissolved in water. When hydrogen …
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Hydrogen fluoride is a colorless chemical made of a hydrogen atom and a fluorine atom. When dissolved in water it is called hydrofluoric acid. As much as 60 percent of hydrogen fluoride in industrial settings is used to make refrigerants. It is used in manufacturing silicon semiconductor chips and as a catalyst in oil refineries to make high ...
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1 Mol Ca = 40g and 1 Mol F = 19g. 1 Ca will bind 2 F, thus 40g Ca will bind 38g F from 40g HF. 1 ml of you body tissue contains about 0.1mg Ca, and 0.1mg HF will let it precipitate almost completely. In …
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IUPAC Standard InChIKey:KRHYYFGTRYWZRS-UHFFFAOYSA-N. CAS Registry Number: . Chemical structure: This structure is also available as a 2d Mol file 3d SD file …
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HF + NaOH → NaF + H 2 O. Physical properties: Sodium fluoride is found as an odorless, crystalline solid that is white to greenish in color, depending on its purity. Its density is 2.56 g/mL, melting point is 993 °C, and boiling point is 1,704 °C. ... It is a hygroscopic solid (absorbs moisture from air). Chemical properties: Sodium ...
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This chapter summarizes the relevant epidemiologic and toxicologic studies of hydrogen fluoride. It presents selected chemical and physical properties, toxicokinetic and mechanistic data, and inhalation-exposure levels from the National Research Council and other agencies. The committee considered all that information in its evaluation of the …
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What hydrogen fluoride is. Hydrogen fluoride is a chemical compound that contains fluorine. It can exist as a colorless gas or as a fuming liquid, or it can be dissolved in water. When hydrogen fluoride is dissolved in water, it may be called hydrofluoric acid. Hydrogen fluoride can be released when other fluoride-containing compounds such as ...
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Hydrogen fluoride is synthesized by the reaction of a fluoride salt with a concentrated acid, (10.2.1). The HF vapor may be condensed, and then subsequently purified by distillation. ... properties. The high stability of fluorocarbon compounds is a consequence of the C-F bond energy (486 kJ/mol) in comparison with that of C-H (415 kJ/mol ...
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