Why does a newly opened can of warm soda have less carbonation than a newly opened can of cold soda? a. at a constant pressure, gases  are less soluble in liquids at higher temperatures. b. at a constant pressure, gases are more soluble in liquids at higher temperatures. c. liquids expand at higher temperatures, leaving less room for gases. d. liquids contract at higher temperatures, making more room for gases.

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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-