A metallurgist begins with 1,250 grams of vanadinite (Pb5(VO4)3Cl) and ends up with 135 grams of pure vanadium and 915 grams of pure lead. The percent composition of vanadium in the ore is , and the percent composition of lead is .

Earth's axis of rotation is tilted at an angle of 23.5 degrees. what is one change you would see on earth if its axis was not tilted?

Give the set of reactants (including an alkyl halide and a nucleophile) that could be used to synthesize the following ether: draw the molecules on the canvas by choosing buttons from the tools (for bonds and charges), atoms, and templates toolbars, including charges where needed. ch3ch2och2ch2chch3 | ch3

Why do electrons further from the nucleus have more energy