5) An electron is promoted from the n=2 to the n= 3 energy level in a hydrogen atom.
a. Does the electron release or absorb energy during this transition?

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?

How many moles of oxygen gas are produced from the decomposition of six moles of potassium

How many valence electrons are in atom of radon?