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

Mass Number, What is meant by ''mass number''

What is meant by ''mass number''

How reliable are measurements, Q. How reliable are measurements? When s...

Q. How reliable are measurements? When scientists glance at measurements they want to know how accurate as well as how precise the measurements are. Accuracy demotes to how c

Uses trihydric alcohols - hydrocarbon, Uses Trihydric alcohols (a) It i...

Uses Trihydric alcohols (a) It is used as antifreeze in automobile radiator. (b) It is used in the preparation of good quality of soap-hand lotions shaving creams and tooth

Atoms.., how do i draw an atom amd label it''s components

how do i draw an atom amd label it''s components

Explain aldol condensation, Write one reaction each to exemplify the follow...

Write one reaction each to exemplify the following: (a) Aldol condensation (b) Friedel-Crafts reaction

Thermodynamics, Calculate the free energy change of following reaction at29...

Calculate the free energy change of following reaction at298 kelvin H2+I2=2HI if the enthalpy change is 51.8816kj and the entropy change is 166.15j is this reaction thermodyanamica

Illustrate ionic bonds or electrovalent bond, Q. Illustrate Ionic Bonds or ...

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

The structure of spiropentadiene, The structure of spiropentadiene The ...

The structure of spiropentadiene The structure of spiropentadiene is shown below; it undergoes a Diels-Alder reaction with two molar equivalents of 1,3-cyclopentadiene. Spirope

Stochiometry, How many grams of CO2 are produce if 42.0 mol of LiOH react?

How many grams of CO2 are produce if 42.0 mol of LiOH react?

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