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An astrophysicist working at an observatory is interested in finding clouds of hydrogen in the galaxy. Usually hydrogen is detected by looking for the Balmer series of spectral lines in the visible spectrum. Unfortunately, the instrument that detects hydrogen emission spectra at this particular observatory is not working very well and only detects spectra in the infrared region of electromagnetic radiation. Therefore the astrophysicist decides to check for hydrogen by looking at the Paschen series, which produces spectral lines in the infrared part of the spectrum. The Paschen series describes the wavelengths of light emitted by the decay of electrons from higher orbits to the n=3 level. What wavelength lambda should the astrophysicist look for to detect a transition of an electron from the n= 7 to the n=3 level?
how much energy is needed to heat 24.8g water from 64 degrees to 123 degrees celsius?
After the resulting reaction was complete, back titration required 10.40 mL of 0.1212 M NaOH. Assuming that the tablet contained only calcium carbonate and an inert binder calculate the mass of calcium carbonate and mass percent of calcium carbona..
At this temperature, calculate the number of moles of NO2(g) that must be added to 2.76 mol of SO2(g) in order to form 1.20 mol of SO3(g) at equilibrium.
The temp rises to 17.9 degrees celsius. Neglecting heat capacity of container, what is the specific heat of the metal? The specific heat of H2O(l) is 4.18 J/(g*degree Celsius)
The remaining solid residue dissolved when 6 M NH3 was added but no precipitate was formed. The solution was then acidified with 6M HCl and a white precipitate formed. Based on this info
Calculate the bond order for one carbon-carbon bond in benzene molecule, taking a and pi bonds
A balloon contains 0.128 mol of gas and has a volume of 2.76L. If an additional 0.073 mol of gas is added to the balloon (at the same temperature and pressure), what will its final volume be.?
What is the approximate pH of a solution of the salt NH4(O2CCH3) Ammonium Acetate? No calculations, only reasoning needed.
The charges of the ions in an ionic compound affect the strength of the electrostatic attraction holding that compound together. Based on ion charges, rank these ionic compounds by their expected melting points.
concentration was dissolved in HCl and diluted to 100.0 mL. Aliquots of 10.00 mL of this unknown solution were added to different volumes of a 2.08 ÃŽ¼g/mL Ca standard solution and diluted to 200.0 mL. Find the weight percent of Ca in the rock sam..
Cv and Cp denote the molar specific heat capacities of a gas at constant volume and constant pressure, respectively. Then (A) Cp âˆ' Cv is larger for a diatomic ideal gas than for a monoatomic ideal gas.
which compound has lowest soulubility in water?
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