In general terms, the standard enthalpy change of reaction determines if a chemical reaction will take place, the kinetics will then tell how fast the reaction is. A reaction can be very exothermic but will not happen in practice if the reaction is too slow. If a reactant can react to form two different products the thermodynamically most stable product will generally form except in special circumstances when the reaction is said to be under kinetic reaction control. It is possible to make predictions about reaction rate constants ...

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Chemical kinetics, Chemical kinetics - Rate of reaction, Chemical kinetics - Factors that influence the rate of a reaction, Chemical kinetics - Concentration, Chemical kinetics - Physical state, Chemical kinetics - Temperature, Chemical kinetics - Catalysts, Chemical kinetics - Equilibria, Chemical kinetics - Enthalpy

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In general terms, the standard enthalpy change of reaction determines if a chemical reaction will take place, the kinetics will then tell how fast the reaction is. A reaction can be very exothermic but will not happen in practice if the reaction is too slow. If a reactant can react to form two different products the thermodynamically most stable product will generally form except in special circumstances when the reaction is said to be under kinetic reaction control. It is possible to make predictions about reaction rate constants ...

See also:

Chemical kinetics, Chemical kinetics - Rate of reaction, Chemical kinetics - Factors that influence the rate of a reaction, Chemical kinetics - Equilibria, Chemical kinetics - Enthalpy

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A variety of other methods are known to effect nuclear fusion. Some are "cold" in the strict sense that no part of the material is hot (except for the reaction products), some are "cold" in the limited sense that the bulk of the material is at a relatively low temperature and pressure but the reactants are not, and some are "hot" fusion methods that create macroscopic regions of very high temperature and pressure. Locally cold fusion : Muon-catalyzed fusion is a well established and reproducible fusion process that o ...

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Cold fusion, Cold fusion - History of cold fusion by electrolysis, Cold fusion - Early work, Cold fusion - Pons and Fleischmann's experiment, Cold fusion - Experimental set-up and observations, Cold fusion - Continuing efforts, Cold fusion - Arguments in the controversy, Cold fusion - Current understanding of nuclear processes, Cold fusion - Reproducibility of the result, Cold fusion - Energy source vs power store, Cold fusion - Other kinds of fusion, Cold fusion - External articles, Cold fusion - Related links, Cold fusion - News, Cold fusion - Cold Fusion Commercial Developments

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A typical equilibrium situation is as below: when the forward reaction is occurring at the same rate as the reverse reaction. For simplicity in this example all reactants are aqueous, in solution, because solids and liquids do not enter the equation for the equilibrium constant as discussed in the article on solubility equilibrium (however gases do). The equation of the equilibrium constant is equal to the product of the product concentrations to the power their respective stoichiometric coeffecients divided by the product of the reactant concentrations to the powe ...

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Equilibrium constant, Equilibrium constant - Reaction conditions, Equilibrium constant - Applications, Equilibrium constant - Sources

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According to atomic theory, we could use the number of atoms, not mass, as a measure of matter. This way, the Law can expressed as a stoichometric balance, that is: The number of atoms of a particular element in the reactants must equal the number of those atoms in the products. If we believe that each atom has a specific mass, and that the sum of the atoms' masses is the equal to the total mass of the atoms; then this is the same as Lavoisier's law. This rule applies to classical mechanics. However, it does not apply to relativistic physics. At relativistic energies at ...

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Law of conservation of matter, Law of conservation of matter - Atoms, Law of conservation of matter - Nuclear Processes, Law of conservation of matter - Matter and Antimatter

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A variety of other methods are known to effect nuclear fusion. Some are "cold" in the strict sense that no part of the material is hot (except for the reaction products), some are "cold" in the limited sense that the bulk of the material is at a relatively low temperature and pressure but the reactants are not, and some are "hot" fusion methods that create macroscopic regions of very high temperature and pressure. Locally cold fusion : Muon-catalyzed fusion is a well established and reproducible fusion process that o ...

See also:

Cold fusion, Cold fusion - History of cold fusion by electrolysis, Cold fusion - Early work, Cold fusion - Pons and Fleischmann's experiment, Cold fusion - Experimental set-up and observations, Cold fusion - Arguments in the controversy, Cold fusion - Current understanding of nuclear processes, Cold fusion - Reproducibility of the result, Cold fusion - Energy source vs power store, Cold fusion - Continuing efforts, Cold fusion - Other kinds of fusion, Cold fusion - Commercial developments

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There are five major classifications of chemical reactions. Some common and widely used terms are: Isomerization in which a chemical compound undergoes a structural rearrangement without any change in its net atomic composition; see stereoisomerism Direct combination or synthesis, in which two or more chemical element or compounds unite to form a more complex product; f.e. formation of water from hydrogen and oxygen Chemical decomposition or analysis, in which a compound is decomposed into smaller compounds; f. ...

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Chemical reaction, Chemical reaction - Reaction types, Chemical reaction - Thermochemistry, Chemical reaction - Chemical equilibrium, Chemical reaction - Exothermic reactions, Chemical reaction - Endothermic reactions, Chemical reaction - Chemical kinetics

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See main article: Chemical kinetics. The rate of a chemical reaction is a measure of how the concentration of the involved substances changes with time. Analysis of reaction rates is important for several applications, such as in chemical engineering or in chemical equilibrium study. Rates of reaction depends basically on: Reactant concentrations, which usually make the reaction happen at a faster rate if raised, Surface Area, the amount of the substance being used, Pressure, By increasing the pre ...

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Chemical reaction, Chemical reaction - Reaction types, Chemical reaction - Thermochemistry, Chemical reaction - Chemical equilibrium, Chemical reaction - Exothermic reactions, Chemical reaction - Endothermic reactions, Chemical reaction - Chemical kinetics

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Catalysts can be either heterogeneous or homogeneous. Heterogeneous catalysts are present in different phases from the reactants (e.g. a solid catalyst in a liquid reaction mixture), whereas homogenous catalysts are in the same phase (e.g. a dissolved catalyst in a liquid reaction mixture). A simple model for heterogeneous catalysis involves the catalyst providing a surface on which the reactants (or substrates) temporarily become adsorbed. Bonds in the substrate become weakened sufficiently for new to be created. The bonds between the products and the cat ...

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Catalyst, Catalyst - Catalysts and reaction energetics, Catalyst - Types of catalysts, Catalyst - Poisoning a Catalyst, Catalyst - Commonly used catalysts

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There are certain implications of the equilibrium constant. If the value is very large, over 1, the reaction is said to lie to the right (of the arrow) indicating a greater concentration of products; values less than 1 lie to the left higher formation rates of reactants, and values of one indicate equal concentrations. Knowledge of the equilibrium constant can help us determine, in an industrial setting f ...

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Equilibrium constant, Equilibrium constant - Reaction conditions, Equilibrium constant - Applications, Equilibrium constant - Sources

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Nuclear fusion - Astrophysical reaction chains. The most important fusion process in nature is that which powers the stars. The net result is the fusion of four protons into one alpha particle, with the release of two positrons, two neutrinos, and energy, but several individual reactions are involved, depending on the mass of the star. For stars the size of the sun or smaller, the proton-proton chain dominates. In heavier stars, the CNO cycle is more important. See stellar nucleosynthesis. Nuclear fusio ...

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Nuclear fusion, Nuclear fusion - Requirements for fusion, Nuclear fusion - Methods of fuel confinement, Nuclear fusion - Important fusion reactions, Nuclear fusion - Astrophysical reaction chains, Nuclear fusion - Criteria and candidates for terrestrial reactions, Nuclear fusion - Neutronicity, confinement requirement, and power density, Nuclear fusion - Bremsstrahlung losses

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Nuclear fusion - Astrophysical reaction chains. The most important fusion process in nature is that which powers the stars. The net result is the fusion of four protons into one alpha particle, with the release of two positrons, two neutrinos, and energy, but several individual reactions are involved, depending on the mass of the star. For stars the size of the sun or smaller, the proton-proton chain dominates. In heavier stars, the CNO cycle is more important. See stellar nucleosynthesis. Nuclear fusio ...

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Nuclear fusion, Nuclear fusion - Requirements for fusion, Nuclear fusion - Methods of fuel confinement, Nuclear fusion - Important fusion reactions, Nuclear fusion - Astrophysical reaction chains, Nuclear fusion - Criteria and candidates for terrestrial reactions, Nuclear fusion - Neutronicity confinement requirement and power density, Nuclear fusion - Bremsstrahlung losses

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Nuclear fuel - Fusion fuels. Most fusion fuels fit in here. They include tritium (3H) and deuterium (2H) as well as helium three (3He). Many other elements can be fused together if they can be forced close enough to each other at high enough temperatures. In general, fusion fuels are expected to have at least three generations based on the ease of fusing light atomic nuclei together. Deuterium and tritium are both considered first-generation fusion fuels; with three permutations in which they can be fused together. See also:

Nuclear fuel, Nuclear fuel - Production of common nuclear fuels, Nuclear fuel - Common chemical forms of nuclear fuel, Nuclear fuel - UOX, Nuclear fuel - MOX, Nuclear fuel - Spent fuel, Nuclear fuel - Common physical forms of nuclear fuel, Nuclear fuel - PWR fuel, Nuclear fuel - BWR fuel, Nuclear fuel - CANDU fuel, Nuclear fuel - Less common nuclear fuel forms, Nuclear fuel - RBMK fuel, Nuclear fuel - TRISO fuel compact, Nuclear fuel - CerMet fuel, Nuclear fuel - Plate type fuel, Nuclear fuel - TRIGA fuel, Nuclear fuel - Rarely used nuclear fuel, Nuclear fuel - Radioisotope Heating Units, Nuclear fuel - Liquid fuels, Nuclear fuel - Uranium Nitride, Nuclear fuel - Uranium Carbide, Nuclear fuel - Theoretically possible nuclear fuels, Nuclear fuel - Fusion fuels

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When the solution above the transformation point is solid, rather than liquid, an analogous eutectoid transformation can occur. For instance, in the iron-carbon system, the austenite phase can undergo a eutectoid transformation to produce ferrite and cementite (iron carbide), often in lamellar structures such as pearlite and bainite. This eutectoid point is at about 0.6% carbon; alloys of nearly this composition are called high-carbon steel, while those which do not undergo eutectoid transformation are termed mild steel. The process an ...

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Eutectic, Eutectic - Metallic eutectics, Eutectic - Other eutectic mixtures, Eutectic - Other critical points: eutectoid and peritectic

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Aromatic nitrations to form nitro compounds take place by generating a nitronium ion from nitric acid and sulfuric acid. Aromatic sulfonation of benzene with fuming sulfuric acid gives benzenesulfonic acid. Aromatic halogenation of benzene with bromine, chlorine or iodine gives the corresponding aryl halogen compounds catalyzed by iron tribromide. The Friedel-Crafts reaction exists as an acylation and an alkylation with as reactants ac ...

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Electrophilic aromatic substitution, Electrophilic aromatic substitution - Basic reactions, Electrophilic aromatic substitution - Other reactions, Electrophilic aromatic substitution - Basic reaction mechanism, Electrophilic aromatic substitution - Substituted aromatic rings, Electrophilic aromatic substitution - Ortho/para directors, Electrophilic aromatic substitution - Meta directors, Electrophilic aromatic substitution - Five membered heterocyclic compounds

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MMC manufacturing can be broken into three types: solid, liquid, and vapor. Solid Powder blending and consolidation: Powdered metal and dicontinuous reinforcement are mixed and then bonded through a process of compaction, air extraction, and heating (possibly via hot isostatic pressing (HIP) or extruding). Foil diffusion bonding: Layers of metal foil are sandwiched with long fibers, and then pressed through to form a matrix. Liquid Stir casting: Discontinuous reinforcement is stirred in ...

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Metal matrix composite, Metal matrix composite - Composition, Metal matrix composite - Matrix, Metal matrix composite - Reinforcement, Metal matrix composite - Manufacturing and forming methods, Metal matrix composite - Applications

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Despite many efforts a definitive reaction mechanism for the Fries rearrangement is not available. Evidence for inter- and intramolecular mechanisms have been obtained by so-called cross-experiments with mixed reactants. Reaction progress is not dependent on solvent or substrate. A widely accepted mechanism involves a carbocation intermediate. In the first reaction step a lewis acid for instance aluminium chloride AlCl3 attacks the carbonyl oxygen atom of the acyl group. This oxygen atom is more electron deficient than the ...

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Fries rearrangement, Fries rearrangement - Mechanism, Fries rearrangement - Scope, Fries rearrangement - Limits, Fries rearrangement - Photo Fries rearrangement

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These two steps lead to a basic description of the system and its boundaries, in chemical engineering called a reactor model. The three most simple reactor models are: Ideal (continuosly stirred) Batch reactor Ideal tank reactor, also named Continuously Stirred Tank Reactor (CSTR) Ideal Plug Flow Reactor (PFR) Mass balance - Ideal Batch reactor. A closed system. Many chemistry textbooks implicitly assumes that the studied system can be described as a batch reactor when they write about reaction kinetics and chem ...

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Mass balance, Mass balance - Introduction, Mass balance - Differential mass balances, Mass balance - Ideal Batch reactor, Mass balance - Ideal tank reactor/Continuously stirred tank reactor, Mass balance - Ideal Plug Flow Reactor PFR, Mass balance - More complex problems

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Amino acids are the basic structural building units of proteins. They form short polymer chains called peptides or polypeptides which in turn form structures called proteins. Twenty amino acids are encoded by the standard genetic code and are called proteinogenic or standard amino acids. At least two others are also coded by DNA in a non-standard manner as follows: Selenocysteine is incorporated into some proteins at a UGA codon, which is normally a stop codon. Pyrrolysine is used by some methanogens in enzymes that they use to produce methane. It is coded for similarly to selenocysteine ...

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Amino acid, Amino acid - Overview, Amino acid - General structure, Amino acid - Isomerism, Amino acid - Reactions, Amino acid - List of standard amino acids, Amino acid - Structures, Amino acid - Chemical properties, Amino acid - Hydrophilic and hydrophobic amino acids, Amino acid - Nonstandard amino acids, Amino acid - Uses of substances derived from amino acids

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HCCI - Methods. A mixture of fuel and air will ignite when the concentration and temperature of reactants is sufficiently high. The concentration and/or temperature can be increased several different ways: High compression ratio Pre-heat induction gases Forced induction Retain or reinduct exhaust Once ignited, combustion occurs very quickly. When auto-ignition occurs too early or with too much chemical energy combustion is too fast. In such cases, high in-cylinder pressures can destroy an engine. For this reason, HCCI is typically opera ...

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HCCI, HCCI - History, HCCI - Operation, HCCI - Methods, HCCI - Advantages, HCCI - Disadvantages, HCCI - Control, HCCI - High peak pressures and heat release rates, HCCI - Power, HCCI - Carbon Monoxide and Hydrocarbon emissions, HCCI - Difference from Knock

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Methamphetamine is structurally similar to methcathinone, amphetamine, and other stimulants, and it may be produced from ephedrine or pseudoephedrine by chemical reduction. Most of the necessary chemicals are readily available in household products or over-the-counter medicines. This makes methamphetamine appear unusually easy to make, unlike cannabis and cocaine, which are both harvested directly from plants. Pseudoephedrine hydrochloride and ephedrine hydrochloride are commonly available decongestant drugs without strong euphoric ef ...

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Methamphetamine, Methamphetamine - Production, Methamphetamine - History, Methamphetamine - Current controversy, Methamphetamine - Effects, Methamphetamine - Addiction, Methamphetamine - Undesirable effects, Methamphetamine - Physical and chemical properties of Methamphetamine, Methamphetamine - Methods of use, Methamphetamine - Legality, Methamphetamine - Books

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Methamphetamine is structurally similar to methcathinone, amphetamine, and other stimulants, and it may be produced from ephedrine or pseudoephedrine by chemical reduction. Most of the necessary chemicals are readily available in household products or over-the-counter medicines. This makes methamphetamine appear unusually easy to make, unlike cannabis and cocaine, which are both harvested directly from plants. Pseudoephedrine hydrochloride and ephedrine hydrochloride are commonly available decongestant drugs without strong euphoric ef ...

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Methamphetamine, Methamphetamine - Production, Methamphetamine - History, Methamphetamine - Current controversy, Methamphetamine - Effects, Methamphetamine - Addiction, Methamphetamine - Effects, Methamphetamine - Physical and chemical properties of Methamphetamine, Methamphetamine - Methods of use, Methamphetamine - Legality, Methamphetamine - Books

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