Astudent records the temperature of a mixture of ice and rubbing alcohol as -3.8 k. is this a valid measurement? explain your answer.

No it is not a valid observation as the lowest temperature that can be achieved is 0 K.

a temperature below 0 K is practically not possible hence based on reported temperature of a mixture of ice and rubbing alcohol it can be said that this is not a correct measurement.

So it is suggested that student should repeat the experiment.

  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-

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