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Hydrogen exhibits several series of line spectra in different spectral regions. For example the Lyman series (nf = 1 in Balmer-Rydberg equation) occurs in the ultraviolet region while the Balmer (nf = 2) series occurs in the visible range and the Paschen (nf = 3), Brackett (nf = 4) and Pfund ( nf = 5) series all occur in the infrared range. What is the longest-wavelength (in nm) in the Pfund series?
Microscopic representations for four different solutions containing bases are shown below. What are the relative strengths of the bases shown in I-IV?
Use the Boltzmann equation to calculate the excited-state and ground-state population ratio for HCl (g*/g0=1) at room temperature (25 oC). The frequency of the absorption from the ground to the excited state is 2885 cm-1. What is the population ra..
calculate the energy in joules and calories. required to heat 5.25g of water, from 55 C to 64.8 C
A balloon is filled to a volume of 5.0 102 mL at a temperature of 29.0°C. The balloon is then cooled at constant pressure to a temperature of 1.00 102 K. What is the final volume of the balloon?
Methane diffuses approximately 2.43 times as fast as an unknown gas. Which of the following could be and unknown gas?
Descrbe the pH of a buffer soluton consisting of 100mL containing 0.1M CH3COOH and 0.125 CH3COO-, both before and after the additon
A student analyzed and recorded two potassium emission spectra: 1) one using 0.10 M Potassium sulfate solution; 2) one using 0.10M Potassium nitrate solution;. Determine why will significant differences be observed in the two emission spectra.
Iron has a density of 7.9 g/ cm3. What is the mass of a cube of iron with the length of one side equal to 55.0 mm.
A 250-L tank is evacuated and connected to a 50.0-L bulb filled with compressed argon. After they are joined, the pressure in the bulb falls to 2.20 atm.
Given an equation and an enthalpy change, how much heat is involved when a certain amount of an element
How is the characteristic of line spectrum determined in an element? Does each element produces a particular color?
Write the charge balance eqtn for a saturated soln of CdCO3. Hint: there are 4 relevent chemical eqtns
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