What Do You Mean By Chemical Kinetics

Chemical kinetics is an important area of study in Physical Chemistry and essentially focuses on assisting students in comprehending the various aspects of a chemical reaction. The term "Kinetics" specifically refers to how quickly a quantity changes. 

DEFINITION 
......The Branch Of Physicochemical Under Which The Rate Of Chemical Reactions, The Factors That Affect These Rates, The Reaction Mechanisms By Which Reactions Occur, Etc. Is Studied, Is Called "Chemical Kinetics".  Chemical Kinetics Also Called "Reaction Kinetics"...........
Reaction rate varies greatly, some are very fast (example: Burning) and some are very slow (example: disintegration of plastic bottles in sunlight). There are several factors that affects the rate of reaction. Some of them are: Pressure, Temperature, Presence of catalyst, concentration of reactants, etc.
While a reaction mechanism is a step by step description of how a chemical reaction occur. Information about the mechanism of the reaction is often provided by the use of chemical kinetics to determine the rate equation and reaction order in each reactant.

Chemical dynamics basically describes everything about a chemical process. Like how does a chemical reaction happen? At what rate? What factors affect him? And in how many stages does this happen??
What Is A Chemical Reaction???? 
A chemical reaction simply define as a reaction in  which a substance (or a compound) is converted into a new one with different property. In a reaction, the substance (or a compound) which is converted into new substance (or changes their state) is called 'Reactant' and a newly formed substance is called 'Product'.
In any chemical reaction, as the reaction proceeds, the amount of reactants decreases, whereas the amount of products increases. One has to understand that the rate of the overall reaction depends on the rate at which reactants are consumed or the rate at which the products are formed.

A chemical reaction is usually written by placing an arrow symbol between the reactants and the products. 
                 A   +    B     ➝     C   +  D
              (Reactants)        (Products) 
We all are seeing many Chemical reactions around us.
For Example
A burning of candle, Burning of coal, Photosynthesis, Cooking, Digestion, Explosions, Color changes, Rusting of iron, Formation of water molecule, CO, CO₂ etc. 
          BaCl₂ + H₂SO₄ ➝ BaSO₄ + 2HCl ↓ 
                   2Mg + O₂ ➝ 2MgO

NOTE
One more thing is that when a chemical reaction occurs then some 'Physical' and 'Chemical Changes' occur within the reactant molecule to form a new substance. Sometimes only physical properties are changing and sometimes only chemical properties are changing or sometimes both the physical and chemical changes happened simultaneously. 
For understanding both physical and Chemical changes, let's take an example of a burning candle; 
.....!!!A Burning Candle Is The Best Example In Which Conversion Of Candle Into Wax Is A Physical Change While (Burning Candle) Conversion Of Heat Energy Into Light Energy Is A Chemical Change!!!....... 


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