How many moles of CaCl2 will be produced from 3.572g of Ca(OH)2 reacting with HCl

Classify each statement about effective nuclear charge, zeff, as true or false.

Tell me the iupac name of the following compounds:

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?