If sodium sulfate is used to selectively precipitate one of the cations while leaving the other cation in solution, what is the maximum concentration of sodium sulfate that can be used before the second ion starts precipitating?

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

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.

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains