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Important Points of Chemical Reaction *Chemical reaction involve breaking of old bonds and formation of new bonds. *To equalise the number of atoms, we cannot alter the formulae of the compounds or element involved in the reactions. This is a partly balanced equation as the number of oxygen are not balanced. *The reaction between calcium oxide with water to form slaked lime is used for white washing walls. The reaction taking place is: *The reaction between most metals and acids is also a displacement reaction as the metal displaces hydrogen from the acid. . *The hydrogen gas is collected by the downwards displacement of water as it is lighter then water. Moreover, it is also insoluble in water. *A physical change does not produce a new substance although the initial and final substance appear different and it is reversible. *During a chemical change, the chemical composition of the substance change and new substance with new properties are formed. Energy is either and it is irreversib