what is the uncontrolled chain reaction?
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During an uncontrolled nuclear chain reaction, a radioactive substance gives off energy at a rate that increases rapidly with time, leading to large amounts of radiation and possibly an explosion. ... Fortunately, this occurs with only a few radioactive elements, and only when they are highly purified.
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The reaction is usually endothermic as heat is required to break chemical bonds in the compound undergoing decomposition. ... If decomposition is sufficiently exothermic, a positive feedback loop is created producing thermal runaway and possibly an explosion.
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First-Order Reactions. A first-order reaction is a reaction that proceeds at a rate that depends linearly on only one reactant concentration.
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The reactant that becomes consumed is called the limiting reagent. When the limiting reagent is all consumed, no more product can be formed (reaction complete). The reactant limits the amount of product that can be formed.
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['Pre-flame combustion.', 'Uncontrolled combustion.', 'Controlled combustion and.', 'After burning.']
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A photochemical reaction is a chemical reaction triggered when light energy is absorbed by a substance's molecules.
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In general, short reaction times favour kinetic control, whereas longer reaction times favour thermodynamic reaction control. ... If a reaction is under thermodynamic control at a given temperature, it will also be under thermodynamic control at a higher temperature for the same reaction time.
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Nuclear Chain Reactions. -it is when absorption of a neutron causes nucleus to break apart. ~lots of energy released. ~released neutrons can then be absorbed by other nuclei.
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sequential feedback. A control mechanism for a branched metabolic pathway. The end product of each branch inhibits the first enzymic step of its own branch, which results in an accumulation of the last metabolite of the common pathway.
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In chain reaction. Nuclear chain reactions are series of nuclear fissions (splitting of atomic nuclei), each initiated by a neutron produced in a preceding fission. For example, 21/2 neutrons on the average are released by the fission of each uranium-235 nucleus that absorbs a low-energy neutron.
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A unimolecular reaction is one in which only one reacting molecule participates in the reaction. Two reactant molecules collide with one another in a bimolecular reaction. A termolecular reaction involves three reacting molecules in one elementary step.
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Yes. Every chemical reaction obeys the law of conservation of mass.
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A first-order reaction is a reaction that proceeds at a rate that depends linearly on only one reactant concentration.
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In chemistry, a hydration reaction is a chemical reaction in which a substance combines with water. In organic chemistry, water is added to an unsaturated substrate, which is usually an alkene or an alkyne. This type of reaction is employed industrially to produce ethanol, isopropanol, and 2-butanol.
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Controllable and uncontrollable factors of international marketing. ...  Controllable factor - often called as "Marketing Mix". It includes: Product, Price, Place and Promotion.  Uncontrollable factors- often called as "Environmental Factors“ which are out of control.
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The citric acid cycle is regulated primarily by the concentration of ATP and NADH. The key control points are the enzymes isocitrate dehydrogenase and α-ketoglutarate dehydrogenase. Isocitrate dehydrogenase is allosterically stimulated by ADP, which enhances the enzyme's affinity for substrates.
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A synthesis reaction is a type of reaction in which multiple reactants combine to form a single product. Synthesis reactions release energy in the form of heat and light, so they are exothermic. An example of a synthesis reaction is the formation of water from hydrogen and oxygen.