It is not necessary that chemical reactions can be carried only in the science laboratory. A large number of reactions keep occurring in our daily life. Soaring of milk, a formation of curd, cooking of food, digestion of food, a process of respiration, fermentation of grapes, rusting of iron, burning of a candle, ripening of fruits all is chemical change. In all this case is the identity and nature of substance changes because the chemical reaction takes place in it.
What is Chemical Reaction?
Chemical reactions are the processes in which a new substance with the new properties is formed. It involves chemical changes.
Chemical Reaction (New Concept)
1. Reactant: The substance which takes part in the chemical reaction.
2.Product: The new substances produced as a result of chemical reactions.
In reactions, the substances to react, we call substances as a reactant and convert into new substance called product. During the reaction rearrangement of atoms takes place. As a result, a new substance from after the reaction has entirely different properties. A change involves breaking of old Bond and making of the new chemical bond of a new substance. During process atoms of one element do not change into another element. The only rearrangement of atoms takes place in a reaction. In a given diagram methane reacts with oxygen to form carbon dioxide and water. A change is taking place which involves the rearrangement of elements.
Characteristics of Chemical Reaction
In a chemical reaction, reactant reacts to change into the product.
1. Evolution of gas.
2.Formation of precipitation.
3.Change in color.
4.Change in temperature and
5.Change in the state.
Anyone of these general characteristics tells us whether a reaction took place or not. For example: On mixing two substance, if a gas evolves. Then we can say a chemical change has taken place. Similarly for others characteristics.
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