A chemical reaction does not involve:A.Formation of new substances having entirely different properties than that of the reactantsB.Breaking of old chemical bonds and formation of new chemical bondsC.Rearrangement of the atoms of reactant to form new productD.Changing of the atoms of an element into those of another element to form new products

To determine which statement does not involve a chemical reaction, let's break down each option:

A. Formation of new substances having entirely different properties than that of the reactants

This describes a key feature of chemical reactions. In a chemical reaction, reactants are transformed into products with different properties.
B. Breaking of old chemical bonds and formation of new chemical bonds

This is also a fundamental aspect of chemical reactions. Chemical bonds in reactants are broken, and new bonds are formed in the products.
C. Rearrangement of the atoms of reactant to form new product

Chemical reactions involve the rearrangement of atoms to form new products. The atoms themselves don't change, but their arrangements and bonds do.
D. Changing of the atoms of an element into those of another element to form new products

This statement is incorrect because atoms themselves do not change into different elements during a chemical reaction. Chemical reactions only involve the rearrangement of existing atoms, not the transformation of one element into another. Changing one element into another is a process associated with nuclear reactions, not chemical reactions.
Conclusion:

The correct answer is D. In a chemical reaction, atoms do not change into different elements; rather, they rearrange to form new compounds.