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Page "Le Chatelier's principle" ¶ 16
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exothermic and reactions
Combustion () or burning is the sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat and conversion of chemical species.
Typical examples of exothermic reactions are precipitation and crystallization, in which ordered solids are formed from disordered gaseous or liquid phases.
On the contrary, many exothermic reactions such as crystallization occur at low temperatures.
Engines of similar ( or even identical ) configuration and operation may use a supply of heat from other sources such as nuclear, solar, geothermal or exothermic reactions not involving combustion ; but are not then strictly classed as external combustion engines, but as external thermal engines.
Explosions are some of the most violent exothermic reactions.
This is the physical understanding of exothermic and endothermic reactions within solution.
Chemical exothermic reactions are generally more spontaneous than their counterparts, endothermic reactions.
* http :// chemistry. about. com / b / a / 184556. htm Observe exothermic reactions in a simple experiment
The change ΔH is positive in endothermic reactions, and negative in heat-releasing exothermic processes.
"</ ref > Although this efficiency limitation can be a drawback, an advantage of heat engines is that most forms of energy can be easily converted to heat by processes like exothermic reactions ( such as combustion ), absorption of light or energetic particles, friction, dissipation and resistance.
In confinement, a series of reflective shock waves are generated, which maintain the fireball and can extend its duration to between 10 and 50 msec as exothermic recombination reactions occur.
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.
By definition, the combustion reactions are always particularly exothermic and so enthalpies of combustion are always negative, although the values for individual combustions may vary.
* Rocket engine, using exothermic chemical reactions of the propellant ( s )
There are two different conventions: exothermic reactions in the sample shown with a positive or negative peak, depending on the kind of technology used in the experiment.
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.
Pyrotechnics is the science of using materials capable of undergoing self-contained and self-sustained exothermic chemical reactions for the production of heat, light, gas, smoke and / or sound.
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 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.
In practice, virtually all solid or liquid substances start to glow around, with a very dull red color, when no chemical reactions take place that produce light as a result of an exothermic process.
Engines of similar ( or even identical ) configuration and operation may use a supply of heat from other sources such as nuclear, solar, geothermal or exothermic reactions not involving combustion ; but are not then strictly classed as external combustion engines, but as external thermal engines.

exothermic and increase
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.
The increase in temperature, as created by a match, allows the reaction to start and then it heats itself, because it is exothermic.
* Where an exothermic reaction causes heating of the reaction vessel which is not controlled, the rate of reaction can increase, in turn causing heat to be evolved even more quickly.
When N < sub > 2 </ sub > O breaks down in the engine's combustion phase, the oxygen atoms are freed from their bond to the nitrogen atoms in an exothermic reaction, contributing to the overall power increase.
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.
In a star in which thermal pressure is in equilibrium with overlying pressure, initiation of a new exothermic reaction would cause an increase in temperature and thermal pressure, to which the star would respond by expanding and cooling.

exothermic and temperature
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.
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.
Although the reactants are stable at room temperature, they burn with an extremely intense exothermic reaction when they are heated to ignition temperature.
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.
The temperature of the system in NVE is naturally raised when macromolecules such as proteins undergo exothermic conformational changes and binding.
When combined, the reactants undergo a violent exothermic chemical reaction, raising the temperature to near the boiling point of water.
The exothermic oxidation reaction maintains the temperature of the reburn tunnels.
* 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.

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