Theoretically, if you start with 0.325 g of copper, after the second lab day you should recover grams of copper.

a. less than 0.325

b. 0.325

c. more than 0.325

d. twice as many

The correct answer is Option a.

Explanation:

We are given:

Mass of copper used initially = 0.325 g

When, the given amount of copper was exposed to air, copper undergoes oxidation and leads to the formation of its oxide.

The chemical equation for the formation of copper oxide follows:

During this reaction, some of the copper gets converted to its oxide.

So, after the second day of lab, copper will be found less than the initial amount taken.

Hence, the correct answer is Option a.

  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-