Calculate the number of molecules in 6.00 moles H2S?

Which substances have the lowest melting points: ionic covalent, or metallic

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

What is the independent variable in this investigation? mass volume sample number substance density