Explain the following observations: (1) Helium exhibits more visible emission lines than hydrogen; and (2) the emission wavelengths for helium and hydrogen are different. Please consider the following terms when writing this section: shielding, splitting degeneracies, s-orbital, p-orbital, spin, singlet, triplet, electronic transition.

Blank allows you to do calculations for situations in which only the amount of gas is constant a)boyle's law b)combined gas law c)ideal gas law d)dalton's law

Base your answer on the information below and on your knowledge of chemistry. nitrogen dioxide, no2, is a dark brown gas that is used to make nitric acid and to bleach flour. nitrogen dioxide has a boiling point of 294 k at 101.3 kpa. in a rigid cylinder with a movable piston, nitrogen dioxide can be in equilibrium with colorless dinitrogen tetroxide, n2o4. this equilibrium is represented by the equation below. 2no2(g) n2o4(g) + 58kj at standard pressure, compare the strength of intermolecular forces in no2(g) to the strength of intermolecular forces in n2(g).

How many atoms are there in 5.70 mol of mg