Adenosine triphosphate (ATP) is the main \"energy currency\" used in cells. ATP hydrolysis is coupled with unfavorable reactions, making the net change in energy for the set of reactions less than zero (favorable). Although ATP is the main energy currency, other molecules can fulfill this role and take part in coupled reactions. Thioesters, notably acetyl-CoA, release free energy upon hydrolysis. Modify the structure of acetyl-CoA, below, to reflect its structure after hydrolysis. Use the eraser tool to delete the bond that is broken. Add H and O atoms where appropriate. Add charges, if needed.

answer; i believe the correct answer is (solid gold);

  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-

i think the answer is terrae but not 100 percent sure. ▓▬▬ §