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Topic: Endothermic

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	Endothermic and Exothermic (Site not responding. Last check: 2007-11-02)
		In endothermic chemical reactions, the situation is reversed: more chemical energy is stored in the bonds of the product molecules than in the bonds of the reactant molecules.
		By convention + change in H indicates the heat is absorbed, or the reaction is endothermic.
		It you're at the equilibrium temperature (referring to chemical potentials), then the process is always endothermic for first order phase transitions of water (from solid up) at lower pressures, because you're trying to convert all of the solid to liquid and the system is stable.
	www.physicsforums.com /showthread.php?t=100698 (530 words)

	Endothermic cooler for electronic components - Patent 5184470
		An endothermic cooler according to claim 1 in which said segregating means comprises a water impervious membrane, and said means for rendering said segregating means ineffective comprises a membrane piercing means coupled to said solenoid.
		An endothermic cooler according to claim 1 in which said segregating means comprises a conduit coupling said source of water to said enclosure, and said means for rendering said segregating means ineffective comprises a valve in said conduit.
		Because the best endothermic solution preferably comprises a very soluble salt with a large endothermic heat of mixing, a cooling factor (CF) was calculated to serve as a guide for selecting the optimum salt-water system, that is, the system having the least weight for a given cooling requirement.
	www.freepatentsonline.com /5184470.html (2470 words)

	Endothermic fire protective material - Patent 5059637
		A water-base endothermic fire protective material comprising a heat curable thermosetting resin, inorganic fibers, an endothermic inorganic filler, and thermoplastic binder resin is disclosed.
		The present invention relates to a water-based endothermic fire protective material comprising a heat curable thermosetting resin, inorganic fibers, endothermic inorganic filler and thermoplastic resin which is particularly useful for fire stopping purposes.
		The present invention relates to water-based endothermic fire protective materials capable of withstanding prolonged flame and heat exposure and having improved resistance to degradation during the subsequent impact, erosion, and cooling effects of a hose stream.
	www.freepatentsonline.com /5059637.html (1902 words)

	Patent 7,067,580
		These endothermic agents may be micronized and added to the polymer(s) after said polymer(s) have been relaxed by either controlled heating, dissolution or suspension in a plasticizer or solvent.
		The endothermic agents are then subjected to a mixing process by which they are distributed through and suspended in the polymer(s)' interstitial spaces, or in the interstitial spaces of the outer surface of the polymer(s), and fixed therein through final curing steps which result in the inventive thermal control composite i.e.
		The polymer and endotherm combinations were then mixed thoroughly to insure the distribution, dispersal, and suspension of the endotherms in the polymers's interstitial spaces; said spaces being formed during the softening of the polymers' long chains of mostly linear molecules.
	www.pharmcast.com /Patents100/Yr2006/June2006/062706/7067580_Composite062706.htm (1143 words)

	Endothermic gas generator
		Complete separation is then achieved between the exothermic reaction in the primary circuit and the endothermic reaction in the secondary circuit retort.
		A consequence of this is the very stable operating conditions obtained in the Lo-Dew gas generator, particularly in terms of operating temperature, in contrast to the traditional endogas generator.
		In conventional endotermic gas generator, in fact, air is added in the secondary circuit and, as a consequence, both exothermic and endothermic reactions take place in the retort.
	www.fornitecnica.it /endothermic_gas_generator.htm (270 words)

	Endothermic reaction (Site not responding. Last check: 2007-11-02)
		In chemistry, an endothermic reaction is one that requires heat to break the bonds of the reactants.
		This means that when the solution in which the reaction is taking place loses heat, the reaction is endothermic.
		An endothermic reaction is the opposite of an exothermic reaction.
	www.xasa.com /wiki/en/wikipedia/e/en/endothermic_reaction.html (114 words)

	Endothermic and Exothermic Reactions
		To demonstrate an endothermic process, Barium hydroxide (octahydrate) and Ammonium nitrate are mixed (in a 2:1 ratio) in a small beaker.
		This reaction displays the endothermic process and illustrated the interaction between changes in enthalpy and entropy is spontaneous chemical reactions.
		An endothermic reaction may thus be spontaneous at constant pressure if the positive value of the heat absorbed is offset by a sufficient increase in entropy (randomness).
	www.chem.umn.edu /outreach/EndoExo.html (700 words)

	Endothermic Reactions
		One example of an endothermic reaction is the dissolving of ammonium
		When an athlete or sportsperson hurts themselves they mix the contents of the bag together and put it on the painful part of their body.
		One example of an endothermic reaction is the dissolving of
	www.ewart.org.uk /science/patterns/pat10.htm (342 words)

	Endogas® Endothermic Gas Generators for Hardening, Brazing, Sintering & Carburizing
		An endothermic atmosphere is produced at a low cost from any regular fuel gas such as natural gas, propane or butane.
		Endogas atmosphere generators are used with heat treating furnaces of suitable design for the protection of surfaces being treated or as a carrier for carburizing.
		An endothermic atmosphere is used effectively as a carrier gas in gas carburizing applications with small amounts of propane or natural gas being added to the product gas to supply the hydrocarbons.
	www.secowarwick.com /thermal/bulletins/endogas.htm (729 words)

	Unit A Technology Idea
		Exothermic reactions release heat energy during the reaction - because of this, the surroundings gain heat energy and a temperature increase of the surroundings can be recorded.
		Endothermic reactions absorb heat energy - because of this, the surroundings lose heat energy to the reaction and a temperature decrease can be recorded.
		In short, a chemical reaction that feels "cooler" is called an endothermic reaction.
	www.scienceman.com /science10/pgs/techid_u1_11.html (630 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: 2007-11-02)
		The opposite of an endothermic process is an exothermic process, one that releases energy in the form of heat.
		Endothermic, also known as endergonic, refers to a transformation in which a system receives heat from the surroundings:
		If the surroundings do not supply heat (e.g., when the system is adiabatic), an endothermic transformation leads to a drop in the temperature of the system.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=endothermic (222 words)

	ATP-induced Reverse Temperature Effect in Isohemoglobins from the Endothermic Porbeagle Shark (Lamna nasus) -- Larsen ...
		ATP-induced Reverse Temperature Effect in Isohemoglobins from the Endothermic Porbeagle Shark (Lamna nasus) -- Larsen et al.
		The evolutionary convergence of endothermic tunas and lamnid
		in the bluefin tuna (Thunnus thynnus), an endothermic teleost,
	www.jbc.org /cgi/content/abstract/278/33/30741 (292 words)

	endothermic and exothermic reactions (Site not responding. Last check: 2007-11-02)
		Endothermic reaction can be cold enough to cause frost bite.
		Use a insulated glove for the endothermic reaction.
		Endothermic: Using funnel, add the ammonium thiocyanate into the flask containing the barium hydroxide.
	chemlearn.chem.indiana.edu /demos/Endother.htm (388 words)

	GK-12 Sensors!
		An exothermic reaction produces heat, and endothermic reactions absorb heat from the surroundings.
		During an exothermic reaction, more energy is produced from the formation of new bonds than energy is required to break existing bonds.
		The opposite is generally true for a reaction which is endothermic.
	www.eece.maine.edu /research/gk12/endothermicexothermicreations.htm (210 words)

	Endoexothermic
		Neutralization reactions are usually exothermic but when you add baking soda to vinegar it is slightly endothermic.
		You would think at first this would be a heat absorbing (endothermic) process, because it looks like the bond between H and Cl is broken.
		Tell whether each of the following is a chemical or physical change and further describe each chemical change as endothermic or exothermic and the physical changes as absorbing or releasing energy.
	www.sciencebyjones.com /endoexothermic.htm (706 words)

	Endothermic heat production in honeybee winter clusters -- Stabentheiner et al. 206 (2): 353 -- Journal of Experimental ...
		Endothermic heat production in honeybee winter clusters -- Stabentheiner et al.
		Note the warm thorax (yellow and white spots) of the endothermic bees with shivering thermogenesis.
		Bees that visited the surface are visible at the lower left end of the cluster.
	jeb.biologists.org /cgi/content/full/206/2/353 (2650 words)

	Urban Dictionary: endothermic
		endothermic isn't defined yet, but these are pretty close:
		Substances which swell as a result of heat exposure thus increasing in volume and decreasing in density.
		Intumescents are typically endothermic to varying degrees, as they can contain chemically bound water.
	www.urbandictionary.com /define.php?term=endothermic (233 words)

	[No title]
		The answer by one student was so "profound" that the professor shared it with colleagues, via the Internet, which is, of course, why we now have the pleasure of enjoying it as well.
		Most of the students wrote proofs of their beliefs using Boyle's Law (gas cools when it expands and heats when it is compressed) or some variant.
		If hell is endothermic, money will be made by using hell as a giant refridgerator.
	www.strategypage.com /militaryforums/89-17384.aspx (857 words)

	Bergen International: Processing Tips
		Endothermic chemical foaming agents are chemicals that take heat away from the chemical reaction; thus Endothermic.
		And, Foamazol™ Endothermic chemical foaming agents contain no hazardous materials so they are environmentally friendly, safe to process and grades are available for applications where contact with food occurs.
		Today, there are blends of both endothermic and exothermic chemical foaming agents.
	www.bergeninternational.com /html/process.htm (389 words)

	Exothermic and Endothermic Reactions (Site not responding. Last check: 2007-11-02)
		If the heat content of the product(s) is higher than that of the reactants, the reaction is endothermic.
		If, on the other hand, the heat content of the product's is less than that of the reactants, the reaction is called exothermic.
		The change in heat content, ΔH, is the difference between the heat content of the products and that of the reactants.
	members.aol.com /chemman41/exo_and_endothermic_reactions.htm (299 words)

	Decomposition Always Endothermic
		Note the change in word choice: "Endoenergetic" and "exoenergetic" are preferred to "endothermic" and "exothermic." Not all reactions are "thermic" -- some produce things like light and electricity etc. Regards, ProfHoff 587 ==================================================== I do not think that all decomposition reactions are endothermic.
		However, it is possible for the reactions to be spontaneous (favorable) even if they are endothermic by virtue of great entropy increase resulting from the release of gases.
		There is one kind of decomposition reaction which is always endothermic; the decomposition of a gas-phase diatomic molecule (or for that matter a polyatomic molecule) into gas-phase atoms.
	www.newton.dep.anl.gov /askasci/chem00/chem00987.htm (526 words)

	Endothermic reaction process (US5565009) (Site not responding. Last check: 2007-11-02)
		An endothermic reaction furnace includes one or more elongated tubes defining therein an endothermic reaction flow path and a combustion flow path for providing heat to drive the endothermic reaction.
		A process for carrying out an endothermic reaction in an endothermic reaction apparatus comprising a vessel, in which process an endothermic reactant is heated by exothermic reaction of two exothermic reactants in an exothermic reaction flow path to thereby convert the endothermic reactant into an endothermic product, comprising
		causing the endothermic reactant to flow through a plurality of endothermic reaction tubes wherein the endothermic reactant is to undergo the endothermic reaction, the endothermic reaction tubes extending through an exothermic reaction chamber,
	www.delphion.com /details?pn10=US05565009 (528 words)

	The MSDS HyperGlossary: Exothermic and Endothermic
		An endothermic process is one in which heat has to be supplied to the system from the surroundings.
		Endothermic reactions are usually not a great safety hazard.
		However, because the reaction draws heat from its surroundings, the reaction container may become cold and cause condensation or ice to form.
	www.ilpi.com /msds/ref/exothermic.html (544 words)

	Exothermic and Endothermic Reactions
		A endothermic reaction absorbs energy from its surroundings, resulting in a fall in temperature.
		endothermic reactions the temperature of the surroundings decreases.
		Endothermic reactions take in energy from their surroundings.
	www.patana.ac.th /parents/curriculum/Chemistry/units/LR1403.html (631 words)

	Endothermic Gas Control Paenl -l - L&L Special Furnace Co., Inc.
		Endothermic gas provides a base atmosphere of 40% nitrogen, 40 % hydrogen and 20% carbon monoxide.
		Endothermic gas flow system includes manual shut off valve, pressure gauge, solenoid for automatic shut off, Waukee flowmeter with regulating valve (specifically calibrated for endothermic gas at your inlet pressure), and low flow detection system.
		Endothermic gas line has a differential pressure switch and adjustable orifice valve which will indicate low flow condition even at low pressures.
	www.hotfurnace.com /pages/furnaces/en.htm (1267 words)

	Endothermic Products (Site not responding. Last check: 2007-11-02)
		The classic fire protection whistleblower case known all over the world, and particularly in the nuclear business, has to do with inoperable endothermic fire barriers used to protect safe-shutdown wiring between control rooms and reactors in nuclear generating stations in the US.
		This was and remains the mother of all fire protection bamboozles, the result of which underlines the complete indifference our society harbours towards fire protection.
		The reason why, is because Thermo-Lag 330-1 was never used over there and no problems with any of their own endothermic products were known.
	www.geocities.com /astximw/endothermic.html (2125 words)

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