Workshop 2

# Workshop 2 - hydrogen in a gas discharge tube. Why are all...

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Workshop #2 Chem 1A Fall 2010 1. Calculate the mass of 0.360 moles of phosphorous (30.97g/mol)? 2. How many atoms are in 2.87 g of aluminum (molar mass = 26.98)? 3. Locate the following examples of electromagnetic radiation on the figure below. Draw a vertical line for each frequency of radiation and label it. a. The radiofrequency of 106.7 FM KROQ (106.7 MHz) b. Black light radiation (ie UVA radiation), 315-400 nm c. Yellow light, 600 nm d. The 2.5 GHz radiation of a microwave oven e. Cobalt-60 gamma radiation, approximately 3 x 10 20 Hz. f. Arrange the five examples above in order of increasing wavelength, from shortest to longest g. Arrange the five examples above in order of increasing energy, from lowest to highest 10 8 6.626 x 10 -26 10 12 10 16 10 20 6.626 x 10 -22 6.626 x 10 -18 6.626 x 10 -14 Frequency in Hz (s -1 ) Energy in kJ

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4. Four lines are observed for the line emission spectra in the visible region for
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Unformatted text preview: hydrogen in a gas discharge tube. Why are all lines seen at once if hydrogen has only one electron? 5. Calculate the E, , and of a photon that is emitted from a hydrogen atom when an electron falls from n i = 2 to n f = 1. 6. A single photon has a wavelength of 450 nm. Calculate the energy in 1.5 moles of photons. 7. The kinetic energy of an electron ejected from a sheet of Mg by a beam of light is 8.1710-19 J. The frequency of the incident light is 2.12710 15 Hz. Determine the wavelength of the incident light and the work function of Mg. Conversion Factors and Constants 1 GHz = 1 x 10 3 MHz = 1 x 10 9 Hz electron mass = 9.11 x 10 -31 kg speed of light = c = 3.00 x 10 8 m/s Plancks constant = h = 6.6310-34 Js Rydberg constant = R H = 2.1810-18 J 1 J = 1 kgm 2 s-2...
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## This note was uploaded on 11/27/2010 for the course CHEM Chem 1A taught by Professor Benhafensteiner during the Fall '10 term at UC Irvine.

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Workshop 2 - hydrogen in a gas discharge tube. Why are all...

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