What is activation energy, Chemistry

Assignment Help:

Q. What is Activation Energy?

Ans.

Colliding molecules which overcome the activation energy form an activated complex. In the activated complex, original bonds are partially broken, and new bonds are partially formed. The activated complex is unstable and may change to the products or back to the reactants.

For a reaction with low activation energy (see Ea' in above graph), a higher proportion of molecules will have the necessary energy. Hence the reaction rate will be faster. Conversely, for a reaction with high activation energy, reaction rate will be slower.

For example, let us consider the reaction NO2 + CO -> NO + CO2

There are two activation energies for this reaction, as shown in the graph below. Eaf is the activation energy for the forward reaction. Ear is the activation energy for the reverse reaction. In this reaction, the difference between Eaf and Ear is 226 kJ/mol and is called the heat of reaction.

The heat of reaction can also be defined as the difference between the heat content of the reactants and the heat content of the products.

The activation energy for a reaction is usually positive since there is an energy barrier to overcome.


Related Discussions:- What is activation energy

Stuructural proteins, what is the role of structural protein, their types, ...

what is the role of structural protein, their types, how are they formed, significance.

Polymers, any information of polymers

any information of polymers

What are the chemical properties of halogens, Q. What are the Chemical Prop...

Q. What are the Chemical Properties of Halogens? Ans. he halogens have 7 valence electrons in their outermost shell. Note that 7 is one electron short of the octet.

Molar concentration of a saturated solution, The K sp of the phosphate fer...

The K sp of the phosphate fertilizer CaHPO 4 .2 H2O is 2.7 x 10 -7 at 25 o C.  What is the molar concentration of a saturated solution?  What mass of this compound will dissolve

Reaction, how analysis of iodine value

how analysis of iodine value

Hybrid propellants - types of rocket propellants, Hybrid propellants: T...

Hybrid propellants: These propellants are the propellants which contain solid fuel & a liquid oxidiser. For instance, liquid N 2 O 4 or liquid oxidizer and acrylic rubber (s

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