Answer : The correct option is C.
Explanation :
Chemical change : It is defined as a change in which a new compounds are formed by the chemical reaction. Changes occurs in their chemical composition and properties.
The molecular structure of a substance changes in a chemical reaction is a chemical change.
- Change in molecular structure means that there is a breaking and formation of bonds in a molecule.
The example of chemical change in terms of change in molecular structure is the reaction of hydrogen with oxygen.
The reaction of hydrogen with oxygen is,

In this reaction, the H-H bond is break and O-H bond is form.
Well its Organic Chemistry... and is the Fractional Distillation of Crude Oil
Protons and neutrons have most of the mass but occupy very little of the volume of the atom.
The rotation of the Earth causes sunlight to move from east to west and then it just keeps repeating it over and over again.