Which of the following is fact-based science rather than part of a belief system
a. astrology
b. paranormal investigation c. chemistry
d. philosophy
e. cultural rituals

c. chemistry

Explanation:

it uses science and math which are based on facts.

The correct answer will be option-C.

Explanation:

The aim of scientific investigations is to understand and explain the natural phenomenon. This aim can be achieved by using the scientific methods which provide the pieces of evidence to explain and understand the natural events.

The scientific investigation is not based on the belief system, personal opinions and the co-incidences which cannot explain the natural phenomenon. They are considered as a part of the pseudoscience practice as they lack evidence.

Since chemistry is the field of study which can explain any natural phenomenon by performing an experiment which provides evidence, therefore, Option-C is the correct answer.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-