.An electron in the hydrogen atom makes a transition from a principal energy state ni to an energy state n=4. If the photon emitted has a wavelength of 734 nm, calculate the initial energy state ni? Constants: h= 6.63x10-34 J. S, C= 3x10 8 m/s and RH = 2.18x10-18 J.

1.aluminum chloride (alcl3), and sodium hydroxide (naoh) can react to form aluminum hydroxide (al(oh)3) and sodium chloride (nacl).    you have 13.4 g of aluminum chloride and 10.0 g of sodium hydroxide. answer the following questions: •what is the balanced equation for this reaction? •if you use all 13.4 g of aluminum chloride, how many grams of aluminum hydroxide can be formed? work must be shown to earn credit •if you use all 10.0 g of sodium hydroxide, how many grams of aluminum hydroxide can be formed? work must be shown to earn credit •how many grams of aluminum hydroxide will actually be made?     which reagent is limiting? explain your answer.

1. list three scientific reasons cockroaches may fly.

What is i fracture in the crust called when land move up, down or sideways