13. The fuel tank of an airplane has a device that measures the fuel's temperature. Before the airplane took off, the temperature of the fuel was 27°C. After the airplane had been flying for one hour, the
temperature of the fuel had decreased to 3°C. Which of the following must have happened to the
molecules of the fuel?

- both b and d.

-since b and d are the closest coastlines then that makes it the most affected.

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c8h10 is your answerr

  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-

can you list the answers so i can answer