Exothermic Reaction


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Exothermic Reaction

 

a chemical reaction in which heat is given off. Examples of exothermic reactions are combustion, neutralization, and most of the reactions involving the formation of chemical compounds from elements. The amount of heat liberated during an exothermic reaction depends on the type of reaction, the mass and nature of the reagents, the phase of the products and reactants, and the specific conditions under which the reaction occurs (for instance, temperature and pressure). The heat of reaction of an exothermic reaction is equal in absolute value but opposite in sign to that of the corresponding endothermic reaction.

References in periodicals archive ?
From the results obtained, the following may be concluded: In-situ composites Al/Ti[B.sub.2] were produced with an exothermic reaction in the Al-[K.sub.2]Ti[F.sub.6]-KB[F.sub.4] system, at 750-950 [degrees]C.
Although substantial amounts of aluminum were also recovered by a poor flux practice, aluminum is wasted when an excessive exothermic reaction occurs.
In the DSC test, a TA Instruments DSC 2010 (the calorimetric precision of DSC is [plus or minus] 0.1%) was used to obtain the exothermic reaction curves of the SMC (sheet molding compound) paste samples.
Finally, the reaction rate would be indicative of an exothermic reaction, and could be related to potentially reducing cure time since time and temperature are key elements when evaluating reactivity.
The bottle and foam feel warm because this is an exothermic reaction in which energy is given off in the form of heat.
12CaO*7[Al.sub.2][O.sub.3] and 3CaO*[Al.sub.2][O.sub.3] produced a rapid exothermic reaction against water to form xCaO-y[Al.sub.2][O.sub.3]-z[H.sub.2]O [22-26].
Considering the overall operating cost, the regeneration process has to be operated at high temperature with diluted oxygen to avoid the exothermic reaction and further causes a deactivation of metal oxides.
Quadratic heat profile is assumed to be generated internally by the exothermic reaction. An exothermic reaction is a chemical reaction that releases energy by light or heat and the typical application of this process occurs in chemical industry.
The parameters enthalpy of activation energy and free energy obtained negative results that indicated exothermic reaction and spontaneous nature of the sorption of metal ions.
The purpose of the exothermic reaction is twofold: it allows larger pockets of entrapped aluminum to coalesce and fall back into the molten bath, and it facilitates reactions between aluminum and fluorides.