One of these substances is water, which has a density of 1.0 g/mL. You also have oil with a density of 0.92 g/mL, and ethanol with a density of 0.85 g/mL. When all 3 substances are mixed together which one is in the middle? A. Water
B. ethanol
C. oil
D. None of the above

Option C. Oil.

Explanation:

The following data were obtained from the question:

Density of water = 1 g/mL

Density of oil = 0.92 g/mL

Density of ethanol = 0.85 g/mL

If all three substances are mixed together, the one with the highest density will be at the bottom, the one with the second highest density will be at the middle while the one with the least density will be at the top.

When we arrange the substance in ascending or descending order according to their density, oil will be at the middle.

Now, we shall arrange in ascending order as shown below:

Position >>> Substance >>>> Density

Top >>>>>>> Ethanol >>>>>> 0.85 g/mL

Middle >>>> Oil >>>>>>>>>>> 0.92 g/mL

Bottom >>>> Water >>>>>>>> 1 g/mL

  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-