Calculate the wavelength of the green line in the visible spectrum of excited H atoms. The green line involves transition from n = 4 to n = 2.

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

Find the mass, in grams, of 5.00*10^23 molecules of f2

Due tomorrow which would have a lower ph, a 0.1 m solution of a strong base or a weak base? why? which would have a higher ph, a 0.1 m solution of a strong base or a weak base? why?