Fire is the rapid oxidation of a material in the exothermic chemical process of combustion, releasing heat, light, and various reaction products .< ref >

The oxidation reaction is very exothermic ( ΔH = − 202. 8 kJ / mol ) which rapidly heats the mixture to the boiling point.

The energy required to sustain the high temperature pyrometallurgical processes may come entirely from the exothermic nature of the chemical reactions taking place, usually oxidation reactions.

SOFC power systems can increase efficiency by using the heat given off by the exothermic electrochemical oxidation within the fuel cell for endothermic steam reforming process.

A fire is a self sustaining, exothermic oxidation reaction that emits heat and light.

Oxidation of an organic compound by Fenton ’ s reagent is rapid and exothermic ( heat-producing ) and results in the oxidation of contaminants to primarily carbon dioxide and water.

This is a strongly exothermic free-flame total oxidation of hydrogen sulfide generating sulfur dioxide that reacts away in subsequent reactions.

Basically, this means that simpler processing equipment ( the mixture has good flowing characteristics ) and less external heat ( the foaming reaction is exothermic and develops internal heat ) are required in one-shot foaming, although, at the same time, the problems of controlling the conditions of one-shot foaming are critical ones.

When scratched with a sharp implement, an exothermic reaction occurs and white fumes are given off as metallic antimony is formed ; when rubbed with a pestle in a mortar, a strong detonation occurs.

If ΔS and / or T are small, the condition ΔG < 0 may imply that ΔH < 0, which would indicate an exothermic reaction.

Reactions with chalcogens are highly exothermic ( release energy ); the reaction with oxygen or air occurs at room temperature, and therefore barium is stored under oil or inert gas atmosphere.

Generic potential energy diagram showing the effect of a catalyst in a hypothetical exothermic chemical reaction X + Y to give Z.

This reaction between carbon dioxide and carbon to form carbon monoxide is endothermic at temperatures above approximately 800 ° C and is exothermic below this temperature.

An explosion is a type of spontaneous chemical reaction that, once initiated, is driven by both a large exothermic change ( great release of heat ) and a large positive entropy change ( great quantities of gases are released ) in going from reactants to products, thereby constituting a thermodynamically favorable process in addition to one that propagates very rapidly.

In thermodynamics, the term exothermic (" outside heating ") describes a process or reaction that releases energy from the system, usually in the form of heat, but also in the form of light ( e. g. a spark, flame, or explosion ), electricity ( e. g. a battery ), or sound ( e. g. burning hydrogen ).

Therefore in an exothermic reaction the energy needed for the reaction to occur is less than the total energy released.

An exothermic thermite reaction using iron ( III ) oxide.

In a thermochemical reaction that is exothermic, the heat may be listed among the products of the reaction.

For an exothermic reaction at constant pressure, the system's change in enthalpy equals the energy released in the reaction, including the energy retained in the system and lost through expansion against its surroundings.

A relatively easy way to determine whether or not a reaction is exothermic or endothermic is to determine the sign of ΔH.

On the other hand if ΔH is negative, the reaction is exothermic, that is the overall decrease in enthalpy is achieved by the generation of heat.

Thus in each term ( endothermic & exothermic ) the prefix refers to where heat goes as the reaction occurs.

This is particularly challenging as the 2H < sub > 2 </ sub > + O < sub > 2 </ sub > -> 2H < sub > 2 </ sub > O reaction is highly exothermic, so a large quantity of heat is generated within the fuel cell.

Iron's very common presence in rocky planets like Earth is due to its abundant production as a result of fusion in high-mass stars, where the production of nickel-56 ( which decays to the most common isotope of iron ) is the last nuclear fusion reaction that is exothermic.

Ionic bonding will occur only if the overall energy change for the reaction is favourable – when the reaction is exothermic.

It is an exothermic reaction which can release large amounts of energy both as electromagnetic radiation and as kinetic energy of the fragments ( heating the bulk material where fission takes place ).

For example, the two diatomic gases, hydrogen and oxygen, can combine to form a liquid, water, in an exothermic reaction, as described by the following equation:

In an adiabatic system ( e. g. a system that does not give off heat to the surroundings ), an exothermic process results in an increase in temperature.

In exothermic reactions, increase in temperature decreases the equilibrium constant, K, whereas, in endothermic reactions, increase in temperature increases the K value.

Although the reactants are stable at room temperature, they burn with an extremely intense exothermic reaction when they are heated to ignition temperature.

The value of the pK < sub > a </ sub > changes with temperature and can be understood qualitatively based on Le Chatelier's principle: when the reaction is endothermic, the pK < sub > a </ sub > decreases with increasing temperature ; the opposite is true for exothermic reactions.

In accordance with Le Chatelier's Principle, when the dissolution process is endothermic ( heat is absorbed ), solubility increases with rising temperature, but when the process is exothermic ( heat is released ) solubility decreases with rising temperature.

Likewise, as the sample undergoes exothermic processes ( such as crystallization ) less heat is required to raise the sample temperature.

The resulting exothermic reaction increased the temperature inside the tank to over and raised the pressure.

After enough of this material accumulates on the surface of the neutron star, thermal instabilities set off exothermic nuclear fusion reactions, which causes an increase in temperature ( greater than 1 x 10 < sup > 9 </ sup > kelvins ), eventually giving rise to a runaway thermonuclear explosion.

The temperature of the system in NVE is naturally raised when macromolecules such as proteins undergo exothermic conformational changes and binding.

The second and third reactions then take place, producing an exothermic reaction-forming initially carbon dioxide-raising the temperature of the coke bed-followed by the second endothermic reaction, in which the latter is converted to carbon monoxide, CO.

When combined, the reactants undergo a violent exothermic chemical reaction, raising the temperature to near the boiling point of water.

The increase in temperature, as created by a match, allows the reaction to start and then it heats itself, because it is exothermic.

* Change in temperature or energy, such as the production ( exothermic ) or loss ( endothermic ) of heat.

More recent snowmelters use other salts, such as calcium chloride and magnesium chloride, which not only depress the freezing point of water to a much lower temperature, but also produce an exothermic reaction.

More recent snowmelters use other salts, such as calcium chloride and magnesium chloride, which not only depress the freezing point of water to a much lower temperature, but also produce an exothermic reaction.

Depending on whether the reaction between the titrant and analyte is exothermic or endothermic, the temperature will either rise or fall during the titration.

When enough material is present in the feed to sustain the process temperature solely by exothermic reaction ( i. e. without the addition of fuel or electrical heat ), the process is said to be " autogenous.