What is the process by which pure metal (like Cu or Fe) is removed from a metal ore like chalcopyrite (CuFeS2)

Aballoon inflated with three breaths of air has a volume of 1.7 l. at the same temperature and pressure, what is the volume of the balloon if five more same-sized breaths are added to the balloon? a balloon inflated with three breaths of air has a volume of 1.7 l. at the same temperature and pressure, what is the volume of the balloon if five more same-sized breaths are added to the balloon?

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

Helium decays to form lithium. which equation correctly describes this decay?