Freezing point depression is: A. When a substance does not need to be as cold as normal in order to freeze.
B. When a substance freezes and then quickly drops in temperature.
C. When a substance drops in temperature until it freezes, then quickly rises in
temperature but stays frozen.
D. When a substance must be colder than normal in order to freeze.
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b is the correct answer

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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-

the right answer is c i just did the question.

you need to have a picture of the atom that way we can answer it