Chemical reaction are changes in which some new chemical substance are formed…
Chemical reaction can be grouped in the following way:
4.Double decompression reaction
8.Oxidation and reduction.
When two or more substance combine to form one compound,a combination reaction is said to have taken place.. Combination can occur in any one of the following week
1.Element + Element ------------> Compound
Fe(s) +. S. -----------> FeS(s)
Decomposition reaction are characterized by a single compound splitting up into two or more simpler substance.When heat is needed to bring about decomposition,the reaction is known as thermal decomposition..
2Pb(NO3)2(s). ------------> 2PbO(s) + 4NO2(g) + O2(g)
In displacement,one element replaces another element in a compound i.e
A. +. BY. ---------> B + AY
The ability of an element to displace another is determined by their relative position in the electrochemical series.Thus,the more electropositive zinc will displace the less electropositive copper from aqueous solution of a copper(II) salt.
Zn(s) + CuSO4(aq) ---------> ZnSO4 +Cu
In this type of reaction,the reactants decompose to form new substance by an exchange of radicals..
AB + CD. ----------->. AD + CB
It is used in the preparation of an insoluble or volatile compound,since it can be separated from the other substances in the reaction system. The two reactants must be chosen such that each supplies one if the groups or ions of the desired Compound.
This process alters the rate of chemical reaction.