How to define fast reactions, Chemistry

Assignment Help:

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.


Related Discussions:- How to define fast reactions

Physical chemisty, Calculate the ratio of d number of molecules in two ener...

Calculate the ratio of d number of molecules in two energy levels at 27''c given E2=9.75x10"-13erg/mol E1=6.95X10"-13erg/mol g1=2 g2=3

The frequency of yellow light having wavelength, The frequency of yellow li...

The frequency of yellow light having wavelength 600 nm is: (1) 5.0x10 14 Hz                 (2)  2.5 x 10 7 Hz        (3) 5.0x 10 7 Hz

Thermodynamics, Given that dH for the reaction is -92.2 kJ mol-1, which is ...

Given that dH for the reaction is -92.2 kJ mol-1, which is larger, the total bond dissociation energy of the reactants or the total bond dissociation energy of the products?

Explain valence bond theory, Q. Explain Valence Bond Theory? This conce...

Q. Explain Valence Bond Theory? This concept starts with the assumption that the bond between the metal ion and the ligand is basically covalent in nature. In order to form a c

PH, what is the pH of sodium hydroxide

what is the pH of sodium hydroxide

What are metal oxides and oxoanions?, The elements of first transition seri...

The elements of first transition series from variety of oxides of different oxidation states having general formulae  MO, M 2 O 3 , M 3 O 6 , MO 2 , MO 3 . These oxides are gene

hyperconjugation, Ask question hyperconjugation in carbine

Ask question hyperconjugation in carbines

Titration , Titration introductions,Objective,Literature,Method ,Discussion...

Titration introductions,Objective,Literature,Method ,Discussion ,Conclusion and References.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd