Classify the following as Arrhenius, Bronsted-Lowry, or Lewis acid-base reactions. A reaction may fit all, two, one, or none of the categories: I. Cu2+ + 4 Cl− CuCl42− II. Al(OH)3 + 3HNO3 Al3+ + 3H2O + 3 NO3− III. N2 + 3 H2 2NH3 IV. CN− + H2O HCN + OH−

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?