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Topic: Reversible reaction

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	Reversibility - Wikipedia, the free encyclopedia
		Reversible dynamics - a mathematical dynamical system, or physical laws of motion, for which time-reversed dynamics are well defined.
		A reversible process in thermodynamics, a process or cycle such that the net change at each stage in the combined entropy of the system and its surroundings is zero.
		A reversible reaction in chemistry, for which the position of the chemical equilibrium is very sensitive to the imposed physical conditions; so the reaction can be made to run either forwards or in reverse by changing those conditions.
	en.wikipedia.org /wiki/Reversible (245 words)

	Incomplete/ Reversible reaction
		A reversible reaction is a chemical reaction that may be reversed.
		An incomplete reaction is a reaction in which neither of the reactants is depleted.
		One could have a reversible reaction that is either complete or incomplete, or one could have an irreversible reaction that is complete or incomplete.
	www.physicsforums.com /showthread.php?p=928846 (1070 words)

	Biochemistry (Site not responding. Last check: 2007-10-14)
		Reaction (i) is an exchange, irreversible reaction (note that ATP is hydrolyzed) that is catalyzed by the enzyme hexokinase.
		Reaction (ii) is a reversible reaction catalyzed by the enzyme phosphoglucose isomerase.
		Reaction (iii) is another exchange, irreversible reaction (again, note that ATP is hydrolyzed) that is catalyzed by the enzyme phosphofructose kinase.
	www.mansfield.ohio-state.edu /~sabedon/biol1020.htm (2119 words)

	General Chemistry Online: Glossary:
		For example, the reaction quotient for A + B = C + D is equal to (C)(D) / ((A)(B)), where the parentheses indicate concentrations.
		In reverse osmosis, pressure is applied to the more concentrated solution to force the flow of solvent to go from more concentrated to more dilute solution.
		Reverse osmosis is used to produce fresh water from sea water.
	antoine.frostburg.edu /chem/senese/101/glossary/r.shtml (838 words)

	Exothermic heat generating apparatus - Patent 5653106
		Reversible reaction between the alkali earth oxide and the water is carried out in the closed system.
		wherein heat generated by hydration reaction of the alkali earth oxide is utilized, and said reaction control means controlling said reversible reaction between the alkali earth oxide and the water depending upon said operating state and said reaction state.
		The reaction control means controls the reversible reaction between the alkali earth oxide and the water depending upon the operating state and the reaction state.
	www.freepatentsonline.com /5653106.html (11003 words)

	Chemical Equilibrium
		When a chemical reaction takes place in a container which prevents the entry or escape of any of the substances involved in the reaction, the quantities of these components change as some are consumed and others are formed.
		As the reaction proceeds, the rate of the forward reaction diminishes while that of the reverse reaction increases.
		When a chemical reaction is at equilibrium, any disturbance of the system, such as a change in temperature, or addition or removal of one of the reaction components, will "shift" the composition to a new equilibrium state.
	www.chem1.com /acad/webtext/chemeq/Eq-01.html (2878 words)

	Thermodynamics
		In the biological setting most all reaction occur in a large excess of fluid, therefore, essentially no gases are formed during the course of the reaction.
		In a reversible reaction involving an ideal gas, DE still will equal zero, however, the pressure will be changing continuously and work (w) is a funtion of P, work done must be determined over the entire course of the reaction.
		Reversible reactions differ from irreversible in that the former always proceeds infinitely slowly through a series of intermediate steps in which the system is always in the equilibrium state.
	web.indstate.edu /thcme/mwking/thermodynamics.html (1538 words)

	chemical equilibrium - HighBeam Encyclopedia (Site not responding. Last check: 2007-10-14)
		The reason reactants in a reversible reaction are never completely converted to product is that an opposing reaction is taking place simultaneously, i.e., some of the newly formed HI is being converted back into hydrogen and iodine.
		For the reversible reaction used as an example, the equilibrium constant is K
		]; for the general reversible reaction n A + m B + · · · [double arrow] p C + q D + · · ·, the equilibrium constant is: where [A], [B], [C], [D], … are the molar concentrations of the substances and n, m, p, q, … are the coefficients of the balanced chemical equation.
	www.encyclopedia.com /doc/1E1-chem-equi.html (528 words)

	Reversible reaction - Wikipedia, the free encyclopedia
		A reversible reaction is a chemical reaction that may proceed in both the forward and reverse directions.
		Irreversible reactions are often called "spontaneous" or "favorable".
		In an irreversible reaction, there is generally a great increase in entropy.
	en.wikipedia.org /wiki/Reversible_reaction (166 words)

	an introduction to chemical equilibria
		A reversible reaction is one which can be made to go in either direction depending on the conditions.
		The reaction has reached equilibrium in the sense that there is no further change in the numbers of blue and orange squares.
		It means that you have a reversible reaction in a state of dynamic equilibrium.
	www.chemguide.co.uk /physical/equilibria/introduction.html (1405 words)

	Haber Process Research
		The reverse is also correct if you remove a reactant, the equilibrium will adjust to make more reactant, this is not useful.
		Running the reaction at 200 atm is the highest pressure with the greatest return value.
		With a reversible reaction, a catalyst which increases the rate will increase the rate of both the forward and the backward reaction.
	haberchemistry.tripod.com (876 words)

	Equilibrium Equations and Equilibrium Constants
		Reactions that are nonreversible are said to go to completion.
		The expression for an equilibrium reaction is determined by the coefficients in the balanced equation.
		Ultimately there comes a time when the forward reaction rate and the reverse reaction rate are equal.
	www.800mainstreet.com /7/0007-007-Equi_exp_k.html (874 words)

	Physics and Chemistry of the Alanates (Site not responding. Last check: 2007-10-14)
		Bogdanovic and Schwickardi showed that, by doping the alanates with an acceptable catalyst, the reaction kinetics at lower temperatures and pressures were increased significantly enough to consider the alanates as a reversible hydrogen storage solution.
		By extrapolating the data, it can be seen that the reversible reaction is predicted to occur at mid- to low temperatures required for safe operation of fuel cells.
		The key characteristic is that the above reaction is reversible under acceptable reaction conditions, and thus further studies to improve the reaction kinetics to achieve the reaction under these theoretically possible conditions should be pursued.
	cobweb.ecn.purdue.edu /~ericjri/physics_and_chemistry_of_the_ala.htm (1264 words)

	#1 Site For Learning Chemistry
		A chemical reaction in which substances react together to produce resultants and the resultants in turn react with one another to produce the original substances is known as an reversible chemical reaction.
		Each chemical reaction is characterized by a reaction rate, which is the rate at which the reactants are combining to produce the final product.
		In a reversible chemical reaction, if the rate of forward reaction and the rate of backward reaction are same, we say that the reaction has reached equilibrium.
	home.att.net /~cat6a/chem_reac.htm (505 words)

	libSBML: Reaction class Reference (Site not responding. Last check: 2007-10-14)
		Moves the id field of this Reaction to its name field (iff name is not already set).
		Moves the name field of this Reaction to its id field (iff id is not already set).
		In SBML L1, a Reaction name is required and therefore should always be set.
	sbml.org /software/libsbml/docs/libsbml-api-ref/classReaction.html (633 words)

	[No title]
		If this reaction were not reversible, the concentrations of hydrogen and iodine would have continued to decrease and the concentration of hydrogen iodide to increase.
		At equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction.
		Neither the forward nor the reverse reaction is spontaneous and neither is favored.
	genchem.chem.wisc.edu /sstutorial/Text13/Tx134/tx134.html (1064 words)

	Typical Examination Questions
		Calculate the rate of reaction when the fructose concentration is 0.5 M. Write an illustrated account of the use of enzymes in the laundry and clothing industries.
		It is found that acetate competitively inhibits the forward reaction with respect to propionate but shows mixed inhibition with respect to ethyl acetate, Also ethyl propionate competitively inhibits the forward reaction with respect to ethyl acetate but shows mixed inhibition with respect to propionate.
		Show how the kinetic equations for a reversible reaction may be developed, stating the assumptions that need to be made.
	www.umdnj.edu /biochweb/education/bioweb/EnzymeQuizzes.htm (1132 words)

	Chemical Energetics (Site not responding. Last check: 2007-10-14)
		All reversible reactions tend to proceed in the direction that decreases the energy of the participants.
		If a reaction A + B = C + D is reversible, the direction in which it goes must depend on the properties of A,B,C,D and on how much of each there is. The more A and B one adds, the more C and D are formed, and vice versa.
		When a cell needs to make a reaction go in an energetically unfavorable (endergonic) direction, it uses the mechanism called coupling: it converts the substrate to something with higher chemical potential by using another reaction that is energetically favorable, that is, exergonic.
	web.mit.edu /esgbio/www/eb/chem/energetics.html (1667 words)

	BBC - GCSE Bitesize - Chemistry \| Chemical reactions \| What is a reversible reaction?
		Many reactions, such as fuels burning, are irreversible - they go to completion and cannot easily be reversed.
		In an endothermic reaction, energy is taken in from the surroundings.
		Reversible reactions are chemical reactions which can go both ways.
	www.bbc.co.uk /schools/gcsebitesize/chemistry/chemicalreactions/3reversiblereactionsrev2.shtml (285 words)

	Dynamic Equilibrium (Site not responding. Last check: 2007-10-14)
		Such a reversible reaction at equilibrium is indicated by a double arrow in the equation.
		The discerning student may note that in our derivation we assumed that the form of the rate law followed the stoichiometry of the reaction, that is the forward and reverse reactions were elementary.
		For a reversible reaction if it is exothermic in one direction it will be endothermic to the same amount in the opposite direction.
	home.att.net /~v.d.singleton/genchem/equilib.htm (3103 words)

	Reaction Mechanisms
		We emphasize that the reaction velocity for each elementary reaction step IS determined by the reaction step and, later on, we will string a sequence of elementary reaction steps together to form what is called a mechanism.
		It is probably easiest to describe the elementary reaction steps and their associated rate laws by just telling you what they are.
		A reaction mechanism is a combination of one or more elementary reaction steps which start with the appropriate reactants and end with the appropriate product(s).
	www.chem.arizona.edu /~salzmanr/480a/480ants/reacmech/reacmech.html (650 words)

	GCSE Notes on Reversible reactions, Ammonia, its Synthesis and Uses at Doc Brown's Chemistry Clinic for chemical ...
		Reversing the reaction conditions reverses the direction of chemical change, typical of a reversible reaction.
		The reverse reaction is used as a simple chemical test for water i.e.
		The synthesis equation for this reversible reaction is...
	www.wpbschoolhouse.btinternet.co.uk /page04/4_74revNH3.htm (3120 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		You have to understand the distinction between the overall reaction vs. the many reversible reactions that are possible in a given problem.
		Now we should look for 16 stoichiometric reversible reactions that are possible and for which the equilibrium constant K_p are known.
		Depending on the complexity the reaction is called single order, second order etc. The reactions that obey the law of mass action in its pure form are called elementary steps.
	eng.sdsu.edu /courses/me696/s94/Lectures.txt (1335 words)

	The enzyme kinetics of reversible reactions
		Both equations (1.59) and (1.68) are useful when modelling reversible reactions, particularly the technologically important reaction catalysed by glucose isomerase.
		The enzyme is bound up with the reactant(s), encouraging their reaction, leaving little free to catalyse the reaction in the reverse direction.
		It is unlikely, therefore, that the same enzyme preparation would be optimum for catalysing a reversible reaction in both directions.
	www.lsbu.ac.uk /biology/enztech/reversible.html (525 words)

	METABOLISM: ENERGY, ENZYMES, AND METABOLIC PATHWAYS (Chap
		Be able to describe the roles of ATP synthesis/hydrolysis and NAD oxidation-reduction reactions in the capture/storage of energy and its utilization for driving anabolic metabolism in living organisms.
		Be able to explain the role of energy changes in chemical reactions; define reaction rate, activation energy, and equilibrium in a reversible reaction.
		-this is because the self-ionization of water is a reversible reaction and rapidly
	www.bios.niu.edu /lotshaw/bios103/enzymes.html (1476 words)

	CHEMICAL EQUILIBRIUM
		In a reversible reaction a state is acxhieved at which the rate of forward reaction becomes equal to the rate of backward reaction.
		Now C and D react each other to reproduce A and B and the reaction now proceeds in both forward and backward directions but the rate of forward reaction and the rate of backward reaction are different.
		Finally a state is established at which the rate of backward reaction becomes equal to the rate of forward reaction.
	www.citycollegiate.com /chemical_equilibrium6.htm (231 words)

	reversible reaction (Site not responding. Last check: 2007-10-14)
		Chemical reaction that proceeds in both directions at the same time, as the product decomposes back into reactants as it is being produced.
		Such reactions do not run to completion, provided that no substance leaves the system.
		Examples include the manufacture of ammonia from hydrogen and nitrogen, and the oxidation of sulphur dioxide to sulphur trioxide.
	www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0030571.html (211 words)

	Chapter 4 Summary Notes
		To determine the conversion or reactor volume for reversible reactions, one must first calculate the maximum conversion that can be achieved at the isothermal reaction temperature, which is the equilibrium conversion.
		Could now solve for X given W, or for W given X. For gas phase reactions, as the pressure drop increases, the concentration decreases, resulting in a decreased rate of reaction, hence a lower conversion when compared to a reactor without a pressure drop.
		Equilibrium Conversion in Semibatch Reactors with Reversible Reactions
	www.engin.umich.edu /~cre/course/lectures/four/index.htm (1186 words)

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