(10 points)what element is oxidized in the following reaction?

hno3 + cu yields cu(no3)2 + no2 + h2o

n
o
cu
h

Cu

Explanation:

HNO₃ is a strong oxidizing agent. It oxidizes the copper metal to copper ions while it is reduced to NO₂ and water.

The oxidation number of copper increases from 0 to +2

Therefore it is a redox reaction.

  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-

cytokinesis is the splitting of a cell membrane to form 2 identical daughter cells. it's similar to mitosis as both cells have identical copies of dna and cytokinesis is a step in the mitotic cycle.