Density of Unknown Substance 25
y = 0.763x+ 0
20
3 15
Mass (2)
10
5
o
0
5
10
20
25
30
15
Volume (ml)
22. KEY IDEA: You walk into the lab and find mass and volume data next to a bottle of a clear & colorless
liquid. You decide to plot the data and it results in the graph shown above with a slope of 0.763. Identify
the unknown liquid using the information below. Unknown is
Support your
answer
y =mx + b
Substance Density (g/mL)
Water 1.00
Ethanol
0.789
Ammonia 0.823
Glycerin 1.259

  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-

no, the red giant is the hottest with 2.00.000.000 degrees celsius. while the white dwarf only 25,000 degrees celsius.

can you attach the