What was important about the copernican revolution? A. It was the first time a new theory was published in a book.

B. The scientific community never accepted it.

C. It demonstrated that scientific understanding was always changing.

D. It caused an immediate shift in accepted ideas.

  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-

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.

it is stable as it is in group 0 which have full outer shells of electrons