What are two elements scientists should investigate, which could substitute for two of the five other elements (O, C, H, N, S) we know to be essential for life?

a. Si, Na
b. SK
c. As, Si
d. S,F

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm

What statement goes against the kinetic theory of gases