what is hf chemistry
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Chemistry: What is HF? Quora User, Chemistry Student. Views · Quora User has 360+ answers and in. Chemistry. HF(g) is a colourless gas whose aqueous solution is known as Hydrofluoric acid, which is the real danger. HF (aq) is a weird acid as it is classified as 'weak' yet it is extremely dangerous. Its danger lies in the fact that it can be absorbed by the skin, causing burns which are not immediately noticed (hence the danger!).
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Object or items made out of Hafnium (an element)... Can you help? Hafnium is a chemical element with symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in zirconium minerals.
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How to Calculate Delta H F How to Calculate Delta H F By Robert Schrader; Updated April 24, 2017 In a chemical reaction, both reactants and the products they form have what are called heats of formation. Expressed by the symbol ΔHf (delta HF), heats of formation are an important part of understanding energy transfer during chemical reactions. In order to calculate ΔHf for any product or reactant, you must have on hand the total amount of heat the reaction produces (ΔH), as well as the ΔHf value for all the other reactants and/or products, all of which your chemistry problem will provide you.
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Hydrofluoric acid From Wikipedia, the free encyclopedia. Hydrofluoric acid is a solution of hydrogen fluoride (HF) in water. It is a precursor to almost all fluorine compounds, including pharmaceuticals such as fluoxetine (Prozac), diverse materials such as PTFE (Teflon), and elemental fluorine itself.
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8.5 Bond Polarity and Electronegativity As we have just seen, there is a difference in electronegativity between H and F, which leads to a polar covalent bond in the HF molecule. As a consequence, there is a concentration of negative charge on the more electronegative F atom, leaving the less electronegative H atom at the positive end of the molecule. A molecule such as HF in which the centers of positive and negative charge do not coincide is said to be a polar molecule.
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- Hydrogen bromide is the diatomic molecule with the formula H Br. It is a colorless compound and a hydrogen halide. Hydrobromic acid is a solution of HBr in water. Both the anhydrous and aqueous solutions of HBr are common reagents in the preparation of bromide compounds. HBr is very soluble in water, forming hydrobromic acid solution, which is saturated at 68.85% HBr by weight at room temperature.
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Hydrogen chloride The compound hydrogen chloride has the chemical formula H Cl. At room temperature, it is a colorless gas, which forms white fumes of hydrochloric acid upon contact with atmospheric humidity.Hydrogen chloride gas and hydrochloric acid are important in technology and industry.ydrogen chloride is a diatomic molecule, consisting of a hydrogen atom H and a chlorine atom Cl connected by a covalent single bond. Since the chlorine atom is much more electronegative than the hydrogen atom, the covalent bond between the two atoms is quite polar.
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- In its elemental form, hafnium is a ductile gray metal with a brilliantly lustrous silver sheen. Exposure to air causes the metal to form an impenetrable oxide film on its surface which lends the metal an extremely high resistance to corrosion and attack by most acids and alkalis.
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Hydrofluoric Acid FLUORINE is a poisonous pale yellow gaseous element found in Group VIIb (i.e. the Halogen Group of elements) of the periodic table. Fluorine is the most reactive element known. It reacts violently with water liberating oxygen and forming hydrofluoric acid (HF).
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Introduction to Computational Chemistry The most common type of ab initio calculation is called a Hartree Fock calculation (abbreviated HF), in which the primary approximation is called the central field approximation.
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The Effect of Operating Conditions on Corrosion in HF Alkylation Units Several terms that are unique to HF alkylation units and that are used throughout this article are defined below. 1  Acid Concentration is the concentration of hydrofluoric acid based on its water content. For example, a solution of 98 wt% HF concentration indicates that there is 2 wt% water in the acid.
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Fluorine: the essentials Fluorine: the essentials. Fluorine is a Group 17 element. Fluorine is the most electronegative and reactive of all elements. It is a pale yellow, corrosive gas, which reacts with practically all organic and inorganic substances.Finely divided metals, glass, ceramics, carbon, and even water burn in fluorine with a bright flame.luorine may be recovered with difficulty as a highly reactive and corrosive pale yellow gas by electrolysis of hot molten mixtures (1:2) of potassium fluoride (KF) and hydrogen fluoride (HF). The electrolyte is corrosive, so is the product. Grease must be avoided because of the fire hazard.
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- 1 APPEARANCE: Hydrogen fluoride is a colorless fuming liquid below 67°F (19.4°C), or a colorless gas. 2  When hydrogen fluoride is combined with water it is known as hydrofluoric acid, a colorless liquid, which in low concentrations is visually indistinguishable from water.
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Chlorofluorocarbon Chlorofluorocarbon: Chlorofluorocarbon (CFC), any of several organic compounds composed of carbon, fluorine, and chlorine. When CFCs also contain hydrogen in place of one or more chlorines, they are called hydrochlorofluorocarbons, or HCFCs. CFCs are also called Freons, a trademark of the E.I. du Pont de Nemours & Company in Wilmington, Del. CFCs were originally developed as refrigerants during the 1930s. Some of these compounds, especially trichlorofluoromethane (CFC-11) and dichlorodifluoromethane (CFC-12), found use as aerosol-spray propellants, solvents, and foam-blowing agents.
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Object or items made out of Hafnium (an element)... Can you help? Best Answer: Hafnium is a chemical element with the symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in zirconium minerals... Hafnium is used in filaments and electrodes. Some semiconductor fabrication processes use its oxide for integrated circuits at 45 nm and smaller feature lengths. Some superalloys used for special applications contain hafnium in combination with niobium, titanium, or tungsten... Hafnium's large neutron capture cross-section makes hafnium a good material for neutron absorption in control rods in nuclear power plants. Most of the hafnium produced is used in the production of control rods for nuclear reactors....
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Lesson 9: Polarity - Simple Cases HF is the only molecule that contains an H-F bond. There are many molecules that contain H-O or H-N bonds. It is not just the H-O and H-N bonds that make these molecules polar. The unbonded pairs of electrons on the nitrogen or oxygen atoms also contribute to the polarity of the molecules.
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Hydrogen chloride The compound hydrogen chloride has the chemical formula H Cl. At room temperature, it is a colorless gas, which forms white fumes of hydrochloric acid upon contact with atmospheric humidity. Hydrogen chloride gas and hydrochloric acid are important in technology and industry.Hydrochloric acid, the aqueous solution of hydrogen chloride, is also commonly given the formula HCl.ydrogen chloride is a diatomic molecule, consisting of a hydrogen atom H and a chlorine atom Cl connected by a covalent single bond.
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Overview of Intermolecular Forces A hydrogen bond is the attractive force between the hydrogen attached to an electronegative atom of one molecule and an electronegative atom of a different molecule. Usually the electronegative atom is oxygen, nitrogen, or fluorine, which has a partial negative charge. The hydrogen then has the partial positive charge.
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Polytetrafluoroethylene PTFE is a fluorocarbon solid, as it is a high-molecular-weight compound consisting wholly of carbon and fluorine. PTFE is hydrophobic: neither water nor water-containing substances wet PTFE, as fluorocarbons demonstrate mitigated London dispersion forces due to the high electronegativity of fluorine.
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2,3,3,3-Tetrafluoropropene 2,3,3,3-Tetrafluoropropene, or HFO-1234yf, is a hydrofluoroolefin with the formula CH2=CFCF3. This colorless gas has been proposed as a replacement for R-134a as a refrigerant in automobile air conditioners. HFO-1234yf is the first in a new class of refrigerants acquiring a global warming potential rating 1⁄335 that of R-134a and only 4 times higher than carbon dioxide.
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- The Bond Type and Structure of HF. Hydrogen fluoride is a polar covalently bonded molecule consisting of one hydrogen atom and one atom of fluorine.Hydrogen's electronegativity number is 2.1 and fluorine's is 4.0, meaning the bond is very polar and nearly ionic.Because of this, the area around the fluorine atom has a slight negative charge, while the area around the hydrogen has a slight positive one.he Bond Type and Structure of HF. Hydrogen fluoride is a polar covalently bonded molecule consisting of one hydrogen atom and one atom of fluorine.
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Lesson 7: Acid & Base Strength In this reaction, HF is the species losing the proton (H+), making it the acid. Water is. the species accepting the proton, to form the hydronium ion, H. 3O. +, making it the base. The F- (aq) is called the conjugate base of HF. It can gain a proton in the reverse. reaction.
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Reducing Agent Stronger the reducing agent the weaker is its corresponding oxidizing agent. The fluorine gas is a strong oxidizing agent and F-is a weak reducing agent. It is known that weaker an acid the stronger is its conjugate base. Similarly the weaker an oxidizing agent the stronger is its corresponding reducing agent.
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HFO Refrigerants HFO Refrigerants. HFO (hydrofluoro-olefin) refrigerants are the fourth generation of fluorine-based refrigerants. HFC refrigerants are composed of hydrogen, fluorine and carbon atoms connected by single bonds between the atoms.
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- HF And H 2o removAl From orgAnic electrolytes Author: C. Herriot, Ph.D. Purpose One of the problems faced by the lithium ion battery (LIB) industry is the contamination of the electrolyte by H 2O which generates HF, thus impacting the cycling life of the battery. Entegris developed an H 2O purifier and an HF
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Hydrogen fluoride ionic or molecular? It is still HF. Because of hydrogen bonding the molecules in the gas phase form pairs. It is still one hydrogen atom bonded to one fluorine atom, and that molecule is hydrogen bonded to another HF molecule in the gas phase. When dissolved in water, the HF molecule completely dissociates.onic bonds are generally between a metal and a nonmetal. When determining whether a bond is covalent or ionic I usually check to see if it is between a metal and a nonmetal or two nonmetals.