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Chemical reactions and equations


                                CHAPTER-1
           CHEMICAL REACTIONS & EQUATIONS

Chemical reactions
1. Chemical reaction-
     Chemical reactions are the processes in which new substances are      formed.
Example-
Magnesium + oxygen----> Magnesium oxide
The burning of magnesium in air to form magnesium oxide is an example of chemical reaction.
Types of chemical reactions-
1.    Combination reactions
2.    Decomposition reactions
3.    Displacement reactions
4.    Double displacement reactions
5.    Oxidation and reduction reactions
Components of chemical reaction are-
1.    Reactant
2.    Product

Characteristics of chemical reaction-
1.    Evolution of gas
2.    Formation of a precipitate (ppt)
3.    Change in colour
4.    Change in temperature
5.    Change in state                                                                                                                   
                      Chemical equations
Chemical equation-
The method of representing a chemical reaction with the help of symbols and formulae of the substances involved in it is known as a chemical equation.
Example-
Mg3N2 + 3H2O ----> 3MgO + 2NH3

Some chemical equations are given below-
1) 2Fe2O3 +3C----> 4Fe+3CO2
2)H2SO4+CaCO3----> CaSO4+H2CO3
3) 2H2+02----> 2H2O
4) CH3COOH+C2H5OH---->  CH3COOC2H5+H2O
5) 1 AgNO3 + 1 LiOH ----> 1 AgOH + 1 LiNO3
6) CH4+2O2----> CO2+2H2O.
7) Sn+2H2SO4----> SnSO4+2H2O+SO2
8) CuO+H2SO4----> CuSO4+H2
9) Mg3N2 + 3H2O ---->  3MgO + 2NH3
10) N2 + O2---->  2 NO



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