Answer
question 7 multiple choice worth 4 points)
(01.03 mc)
object a has a density of 10 g/cm and a mass of 9 g. object b has a density of 10 g/cm. and a mass of 4 g. which object has a greater volume and by how
much?
object a by 5 cubic centimeters
object a, by 0.5 cubic centimeter
object b, by 5 cubic centimeters
object b, by 0.5 cubic centimeter

  Object A, by 0.5 cubic centimeter

Explanation:

Hence volume of object A =

similarly, volume of object B =

Hence from above :  volume of A > volume of B

Difference in volume =

Hence the correct option is Object A has greater volume and  by 0.5 cubic centimeter

  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-