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Topic: Reaction rate

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	Reaction rate - Wikipedia, the free encyclopedia
		Pressure: The rate of gaseous reactions increases with pressure, which is, in fact, equivalent to an increase in concentration of the gas.
		For a chemical reaction n A + m B → C + D, the rate equation or rate law is a mathematical expression used in chemical kinetics to link the rate of a reaction to the concentration of each reactant.
		Reactions 1 and 3 are very rapid compared to the second, so it is the slowest reaction that is reflected in the rate equation.
	en.wikipedia.org /wiki/Reaction_rate (1167 words)

	IodineClockReaction (Site not responding. Last check: 2007-10-11)
		The rate or speed of the reaction is dependent on the concentrations of iodide ion and hydrogen peroxide.
		In the reaction where the concentration of hydrogen peroxide (a molecular compound) is varied, the difference in the total volume of solution is compensated by the equivalent amount of another molecular compound, water.
		In the reaction where the concentration of iodide ion is varied, the difference in total volume is compensated by the equivalent amount of another ion of the same charge, the chloride ion.
	www.nv.cc.va.us /alexandria/science/IodineClockReaction.html (1197 words)

	Comparing Reaction Rate
		Reaction rate usually is expressed in terms of moles per unit time.
		This rate is affected by several factors including the nature of the reactants, concentration of the reactants, temperature, pressure, and the presence of catalysts.
		A working definition of reaction rate as a change in concentration divided by time or as a function of time is necessary.
	www.usoe.k12.ut.us /curr/science/core/plans/rate.html (606 words)

	RATES OF REACTION (via CobWeb/3.1 planet03.csc.ncsu.edu) (Site not responding. Last check: 2007-10-11)
		The more concentrated the faster the rate (note in some cases the rate may be unaffected by the concentration of a particular reactant provided it is present at a minimum concentration).
		If we examine the effect on the rate of a reaction by changing the initial concentration of reactants we may be able to derive the rate law and hence the reaction order.
		Rate = k [NO The rate law is an equation that relates the rate of a reaction to the concentration of reactants raised to various powers.
	www.newi.ac.uk.cob-web.org:8888 /buckleyc/react.htm (1041 words)

	Chemical Kinetics (Site not responding. Last check: 2007-10-11)
		An interesting result is obtained when the instantaneous rate of reaction is calculated at various points along the curve in the graph in the previous section.
		Use the rate constant for the reaction between phenolphthalein and the OH ion to calculate the initial instantaneous rate of reaction for the experimental data listed in the preceding table.
		Because the reaction occurs in a single step, which involves collisions between the two reactants, the rate of this reaction is proportional to the concentration of both reactants.
	chemed.chem.purdue.edu /genchem/topicreview/bp/ch22/rate.html (2167 words)

	Chemical Kinetics: Rate of Reaction (Site not responding. Last check: 2007-10-11)
		The rate of reaction, r, is defined to be the slope of the concentration-time plot for a species divided by the stoichiometric coefficient of that species.
		Notice that this definition produces the same rate of reaction irrespective of which species in the reaction is used to perform the calculation.
		As is evident from the above example, there is a relationship between the stoichiometric coefficient of a species in a reaction, the rate of change of the concentration of that species, and the rate of reaction.
	www.chm.davidson.edu /ChemistryApplets/kinetics/RateOfReaction.html (403 words)

	CHM 1046 (Site not responding. Last check: 2007-10-11)
		This is the average reaction rate, or "rate of reaction"
		Cl, the reaction rate is the negative of the slope (i.e.
		Therefore, the instantaneous reaction rate at 350 sec for the disappearance of C
	wine1.sb.fsu.edu /chm1046/notes/Kinetics/Rxnrates/Rxnrates.htm (1285 words)

	Kinetics
		Kinetics is the area of chemistry concerned with reaction rates.
		It is possible to determine the order of a reactant, and eventually the reaction rate, using initial rate information which includes the concentration of the reactants and the rate at which the product is formed.
		Defined, a reaction mechanism is a series of elementary reactions that are proposed to account for the rate law (kinetics) of a particular reaction.
	www.shodor.org /unchem/advanced/kin/index.html (856 words)

	Reaction Rate of - Search Results - MSN Encarta (Site not responding. Last check: 2007-10-11)
		Reaction, Rate of, amount of a substance that takes part in a chemical reaction in a given time.
		As she frequently remarked when she made any such mistake, it would be all the same a hundred years hence.
		Today it is even possible to distinguish how atoms and molecules move during a chemical reaction by illuminating them with bursts of laser light that...
	uk.encarta.msn.com /Reaction_Rate_of.html (121 words)

	CHEMICAL KINETICS-RATE OF A CHEMICAL REACTION-VELOCITY OF REACTION-RATE CONSTANT-CHARACTERISTICS OF RATE CONSTANT-ORDER ...
		The rate of reaction is not constant through out the activity but decreases with time due to decrease in the concentration of reactants.
		Since the rate of reaction is not constant through out the reaction, therefore, we can not determine the uniform rate of reaction precisely.
		Thus velocity of reaction may be defined as the rate of reaction at a particular given moment i.e.
	www.citycollegiate.com /chemical_kineticsXIa.htm (421 words)

	R
		In the formalism of "transition-state theory", the reaction coordinate is that coordinate in a set of curvilinear coordinates obtained from the conventional ones for the reactants which, for each reaction step, leads smoothly from the configuration of the reactants through that of the transition state to the configuration of the products.
		An elementary reaction, constituting one of the stages of a stepwise reaction in which a reaction intermediate (or, for the first step, the reactants) is converted into the next reaction intermediate (or, for the last step, the products) in the sequence of intermediates between reactants and products.
		A measure of the susceptibility to the influence of substituent groups on the rate constant or equilibrium constant of a particular organic reaction involving a family of related substrates.
	www.chem.qmul.ac.uk /iupac/gtpoc/R.html (2950 words)

	Rates of Reaction and Collision Theory - GCSE Chemistry - Sciencepages.co.uk
		The rate of a reaction is the speed of the reaction.
		In a less concentrated acid, the number of collisions is low, so the rate of the reaction is slower.
		Some reactions have catalysts that can speed them up, but for many reactions there is no catalyst that works.
	www.sciencepages.co.uk /keystage4/GCSEChemistry/m3ratesofreaction.php (1080 words)

	Determination of a Rate Law (Site not responding. Last check: 2007-10-11)
		The rate of a chemical reaction can be measured in terms of the rate of disappearance of one of the reactants or in terms of the rate of the appearance of one of the products.
		The reaction rate constant (k) will be determined by substituting the values of p, and q back into the rate equation, calculating k for each trial and averaging the results.
		The rate of the reaction can be found by dividing 0.1 mmols iodine by the time in seconds it takes for the blue color to appear.
	chem.lapeer.org /Chem2Docs/Rate.Eq.html (840 words)

	Factors Affecting Reaction Rates
		The factors which affect the rate of a reaction are the surface area, nature of the reactants, concentration, temperature, and catalysts.
		The rate of the entire reaction can be determined by timing the interval between the time the two solutions are mixed and the appearance of the blue color.
		C. The rate of the reaction varies exponentially with the concentration of the reactants.
	www.usoe.k12.ut.us /curr/science/core/plans/rate2.html (1131 words)

	Rate Constants and Reaction Mechanisms
		= 9 because the rate is proportional to the square of the concentration of A. b)
		The rate expression can rarely be predicted from the overall reaction, because the overall reaction does not reveal how the reaction actually takes place.
		It’s like if you take 2 seconds to wolf down your burger and fries but another 35 minutes to eat the rest of your meal: the yucky brussel sprouts and other vegetables, then the rate at which you finish your meal is determined by the rate at which you eat the yucky stuff.
	www.emsb.qc.ca /laurenhill/science/rate7.html (661 words)

	orders of reaction and rate equations
		For the purposes of rate equations and orders of reaction, the rate of a reaction is measured in terms of how fast the concentration of one of the reactants is falling.
		This reaction is zero order with respect to A because the concentration of A doesn't affect the rate of the reaction.
		This reaction is first order with respect to A and zero order with respect to B, because the concentration of B doesn't affect the rate of the reaction.
	www.chemguide.co.uk /physical/basicrates/orders.html (1313 words)

	Reaction Rate and Chemical EquliibriaTest (Site not responding. Last check: 2007-10-11)
		Increasing the temperature of a reaction always increases the rate of reaction.
		The rate of a reaction depends on the rate of the slowest step in its mechanism.
		Reaction rates are affected by concentration, collision geometry, and the presence of a catalyst.
	ths.sps.lane.edu /chemweb/unit11/tests/index.htm (640 words)

	Rate Laws (Site not responding. Last check: 2007-10-11)
		The rate of a reaction is a function of temperature (through the rate constant) and concentration.
		The net rate of formation of any species is equal to its rate of formation in the forward reaction plus its rate of formation in the reverse reaction:
		0 and the rate law must reduce to an equation that is thermodynamically consistent with the equilibrium constant for the reaction.
	www.engin.umich.edu /~cre/asyLearn/bits/ratelaws (263 words)

	Chemical kinetics - Wikipedia, the free encyclopedia (via CobWeb/3.1 planet03.csc.ncsu.edu) (Site not responding. Last check: 2007-10-11)
		The main factors that influence the reaction rate include: the physical state of the reactants, the concentrations of the reactants, the temperature at which the reaction occurs, and whether or not any catalysts are present in the reaction.
		In a reversible reaction, chemical equilibrium is reached when the reaction rate of the forward reaction is equal to the rate of the reverse reaction and the concentrations of the reactants and products no longer change.
		The kinetic isotope effect is a difference in the rate of a chemical reaction when an atom in one of the reactants is replaced by one of its isotopes.
	en.wikipedia.org.cob-web.org:8888 /wiki/Chemical_kinetics (1159 words)

	Reaction rate theory
		Kramers reaction rate theory predicts that the solvent dynamics will always decrease the reaction rate, or that in the most favorable situation no barrier recrossings take place and the rate constant corresponds with that of Rice-Ramsperger-Kassel-Marcus (RRKM) rate theory, which gives the TST rate as a function of the collision rate for independent polyatomic molecules.
		Performing the reaction in solution affects the reaction rate constant in two ways: 1) the static energy barrier is changed, due to different energies of solvation for the reactant state and the transition state (on the same ground the equilibrium constant
		By separating the rate constant in terms of the probability to reach the barrier top, the crossing velocity and the transmission coefficient, solvent effects on the reaction rate constant can be studied with molecular dynamics techniques.
	www.cmm.upenn.edu /~ensing/thesis/node9.html (1613 words)

	Reaction rate (via CobWeb/3.1 planet03.csc.ncsu.edu) (Site not responding. Last check: 2007-10-11)
		et:Reaktsiooni kiirus The reaction rate for a reactant or product in a particular reaction is defined as the amount (in moles or mass units) per unit time per unit volume that is formed or removed.
		The order of a Reaction is found experimentally, and, for most basic reactions, is an integer value.
		A catalyst: The presence of a catalyst increases the Reaction rate in both the forward and reverse reactions by lowering the activation energy of the reaction.
	reaction-rate.iqnaut.net.cob-web.org:8888 (406 words)

	SparkNotes: Reaction Rate Laws: Terms
		Method of Initial Rates - A series of experiments wherein the concentration of one reagent at a time is varied and the initial rate (rate at time zero) of the reaction is measured.
		By comparing the change in concentration to the change in rate, it is possible to determine the order of the reaction in each reagent.
		Rate Law - An expression of the dependence of the rate of a reaction on the concentrations of reactants.
	www.sparknotes.com /chemistry/kinetics/ratelaws/terms.html (342 words)

	GCSE Rates of Chemical Reaction Notes at Doc Brown's GCSE Chemistry Clinic. help ideas on factors affecting speed: ...
		If the reaction is allowed to go on, you can measure the final maximum volume of gas and the time at which the reaction stops, though this a very poor measure of rate, because the reaction just goes slower and slower as the reactant amounts/concentrations are decreasing.
		The rate of a reaction that produces a gas can also be measured by following the mass loss as the gas is formed and escapes from the reaction flask.
		It does not matter whether the reaction is an exothermic or an endothermic in terms of energy change, its the activation energy which is the most important factor in terms of temperature and reaction speed.
	www.wpbschoolhouse.btinternet.co.uk /page03/3_31rates.htm (3933 words)

	Determining Reaction Order
		The first step is to control the conditions under which a reaction occurs, and then determine the rate of that reaction.
		An experimenter prepares a reaction mixture of 1.00 M of each of the reactants and measures the rate of reaction initially (at very early times, i.e.
		So the reaction is Third Order in reagent C! To continue, we pick another pair of runs that have a change in the initial concetration of C and just one other reactant.
	itl.chem.ufl.edu /2041_f00/lectures/lec_l.html (1045 words)

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