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Line spectra from all regions of the electromagnetic spectrum, including the Paschen series of infrared lines for hydrogen, are used by astronomers to identify elements present in the atmospheres of stars. Calculate the wavelength of the photon emitted when the hydrogen atom undergoes a transition from n = 5 to n = 3. (R = 2.179 x 10-18 J R = 1.096776 x 10^7 m-1)
A. 205.1 nm B. 384.6 nm C. 683.8 nm D. 1282 nm E. > 1500 nm
The total pressure of a mixture of gases is: dependent only upon the pressure of the gas which is present to the greatest extent. obtained by multiplying the individual pressures by the number of moles and averaging.
If the Ecell measures 1.40 V, what is a more accurate molar concentration of Cr3+, assuming the molar concentration of Ag+ is accurate. What is the sign of the cathode in a galvanic cell. What type of reaction occurs at the cathode.
Assume that the octet rule is followed for the N atom when you draw your structure(s). Pick the correct statement from the choices below.
Briefly explain why it was not necessary for you to determine the mass of unknown liquid that you transferred to the flask before heating.
Calculate P,V and T for initial and final states of each process and produce a plot of the two processes on a P,V diagram. Without resorting to equations, explain why the result for part (b) is greater than or less than the result for part (a).
If 842 pounds of Moon samples have been collected from lunar landings, what is the mass expressed in kilograms? (Given: 1 kilogram= 2.20 pounds).
Suppose a system of three particles, represented by circles, have the possibility of occupying energy states with 0, 10, or 20 . Collectively, the particles must have 30 of total energy. One way the three particles can distribute themselves is sho..
at 710. mm hg a sample of nitrogen gas occupies 625 ml. what volume does the gas occupy if the temperature remains
It is estimated that more than 5 billion metric tons of CO2 is added to the atmosphere each year. Assume that CO2 is an Ideal gas at 25 oC and 1 atm.
C2H4 is emitted by fruits and is responsible for their ripening. Explain why a bunch of bananas ripen faster when placed in a paper bag.
A solution of potassium permaganate is standardized with iron metal, a primary standard. The iron is dissolved in acid, reduced to Fe(II), and titrated with permanganate.
The half-equivalence point of a titration occurs half way to the end point, where half of the analyte has reacted to form its conjugate, and the other half still remains unreacted.
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