Students were given four cubes that are the same size as the one pictured above. Each cube is made of different metals. The masses of the four cubes were recorded in the table below. Complete the table below. Cube NumberMass (g)Volume (cm3)Density (g/cm3)
1503.68
2378.24
3191.36
4567.04
Compare the densities of the cubes to the densities on the following table and determine which cube is made of Iron.

MetalDensity (g/cm3)
Aluminum 2.70
Scandium2.99
Gallium 5.91
Iron7.87
Copper8.86
a
Cube 2
b
Cube 3
c
Cube 4
d
Cube 1

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

  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-