What is the concept of activation energy?
admin Concept of activation energy: The minimum extra amount of energy absorbed by the reactant molecules so that their energy becomes equal to threshold value is called activation energy. In other…
chemistry
What will be the effect of temperature on reaction rate?
Effect of temperature on reaction rate: Temperature has marked effect on the rate of reaction. For most of the reactions the rates of reaction becomes nearly double or even more…
Explain how the collision frequency Z and fraction f of molecules varies with temperature?
The rate of reaction having collision frequency Z and fraction f of molecules will be: Rate of reaction = – dx / dt = Z x f The collision frequency…
Discuss the Kinetic Stability of Fuels.
The combustion of fuels like coal in the presence of air or oxygen is thermodynamically feasible (C + O2 ———–> CO2) because ∆G is negative, yet the fuels are quite…
The rate constant of a reaction is 1.2 x 10-3 sec-1 at 300 C and 2.1 x 10-3 sec-1 at 400 C. calculate the energy of activation of the reaction.
We are given that: k1 = 1.2 x 10-3 sec-1 T1 = 30 + 273 = 303 K k2 = 2.1 x 10-3 sec-1 T2 = 40 + 273 =…
The rate of a particular reaction doubles when temperature changes from 270 C to 370 C. Calculate the energy of activation of the reaction.
We are given that: When T1 = 27 + 273 = 300 K Let k1 = k When T2 = 37 + 273 = 310 K k2 = 2 k…
Define Photochemical Reactions with example.
Some reactions do not take place in the dark but take place only in the presence of light or some other radiation. Such reactions are known as ‘photochemical reactions’. For…
What do you mean by Luminiscence? What are its types?
Luminiscence: The emission of light during a process other than by the action of heat i.e. emission of cold light is called Luminiscence. This can be of following different types:…
What is role of photochemistry in everyday life? Discuss the damaging effects of photochemistry.
Photochemistry plays an important role in everyday life. Some of the examples are given below: 1. In vision 2. In photosynthesis 3. In the manufacture of many inorganic compounds. For…
What do you mean by Chemical Bonding?
A chemical bonding is an attraction between atoms or molecules and allows the formation of chemical compounds, which contain two or more atoms. It is caused due to redistribution of…