The chemical combination is that “A chemical compounds is made of same or different elements or combine with same. Or different elements in a fixed proportion or ratio by mass.”
A chemical reactions in a process in which one or more substances that is
reactant chemically combine together and converted to one or more new substance that is product.
Example: Reactant A and B chemically react together or chemically combine together
and form a compound AB that is new product.
The combination of elements to form compound governed by following laws which is
proposed by two scientists Lavoisier and joseph L. Proust.
I) Law of conservation of Mass.
II) Law of constant proportion