Compare hydroelectric pumped storage to standard hydroelectric. The process of pumping water to a higher elevation, is equivalent to what process in nature? *​ Link to the article https://thinkprogress. org/the-inside story-of-the-worlds-biggest-battery -and-the-future-of-renewable-energy -8984c81283c/

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  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-