How to define fast reactions, Chemistry

Fast reactions are those reactions that occur instantaneously. A fast reaction depends upon the reaction rates. These reactions are so fast that they occur as soon as the reactants are bought together. Generally, these reactions involve ionic species and thus known as ionic reactions. These reactions take about 10-14 to 10-16 seconds for completion. It is very hard to determine the rates of these reactions. It is also defined as a reaction with a half-life of milliseconds or less; such reactions occur so rapidly that special experimental techniques are required to observe their rate. The rate of a reaction is defined in terms of the rates with which the products are formed and the reactants are consumed. For chemical systems it is usual to deal with the concentrations of substances, which is defined as the amount of substance per unit volume. The reaction rate can then be defined as the concentration of a substance that is consumed or produced in unit time. The half-life of a reactant is defined as the time that it takes for half of the initial amount to undergo reaction. The half-life is independent of the initial amount.  The disadvantage of fast reactions is that the time that it takes to mix reactants or to change the temperature of the system may be significant in comparison with the half-life so that the initial time cannot be measured accurately and the other is that the time it takes to measure the amounts of substances may be comparable with the half-life of the reaction.

Posted Date: 7/23/2012 4:42:12 AM | Location : United States

Related Discussions:- How to define fast reactions, Assignment Help, Ask Question on How to define fast reactions, Get Answer, Expert's Help, How to define fast reactions Discussions

Write discussion on How to define fast reactions
Your posts are moderated
Related Questions
Ammonia is a gas for which reliable analytical methods are available to explain concentration in other gases.  To measure ?ow in a 15 inch schedule 40 natural gas pipeline, pure am

what is n-factor and what is the formula for calculating it

The ratio of the concentration of the products raised to its stoichiometric coefficient to the concentration of the reactants raised to its stoichiometric coeff. Mostly, higher th

What are the Interfacial Defects  Grain boundaries are interfaces where crystals of dissimilar orientations meet. A grain boundary is a single-phase interface, with crystals on

Merits of Atomic fluorescence spectrometry: Merits of the technique involve extremely low detection limits for favourable elements and the possibility of handling solid, liqui

Q. Illustrate Ionic Bonds or electrovalent bond? Ans. An ionic bond (also called an electrovalent bond) is the attraction between oppositely charged ions. Elements from o

Name the common element present in the anode mud in electro refinig of copper. Ans) ANTOMONY ,STRONSIUM,SELENIUM,TELLURIUM,SILVER,GOLD AND PLATINUM . THESE ELELMENTS ,BEING LESS R

how to caculate n- factor in equivalent weight

which factor on electron affinity depend?

Acyclic or open-chain compounds Organic compounds where all types of the carbon atoms are associated to one another to form open chains (straight or branched) are known as acyc