Based on the brønsted-lowry theory of acids and bases, which of the following species can act as both a conjugate acid and a conjugate base? hs−/search? q=n+the+reaction+between+c5h5n(aq)+ and+hcl(aq)+represented+above%2c+c5 h5n+acts+as& oq=n+the+reaction+between+c5h5n(aq) +and+hcl(aq)+represented+above%2c+c 5h5n+acts+as& aqs=chrome..69i57.409j0j7& sourceid=chrome& ie=utf-8

Asample of the male sex hormone testosterone, c19h28o2, contains 3.88×10^21 atoms of hydrogen.(a) how many atoms of carbon does it contain? (b) how many molecules of testosterone does it contain? (c) how many moles of testosterone does it contain? (d) what is the mass of this sample in grams?

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

Which compound contain an iron with a 3+ charge