Hmwk3 - Chem2070 Homework #3: Fall 2011 Due September 16 1....

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Unformatted text preview: Chem2070 Homework #3: Fall 2011 Due September 16 1. The figure below gives the first 4 ionization energies for 4 different elements which occupy positions next to one another in the periodic table. Assume that the four elements are found in period 3 of the table; which atoms do you believe correspond to atom 1, 2, 3 and 4? (They’re not necessary in sequence from 1 to 2 to 3 to 4.) 2. Wave A has a frequency of ν = 107.1 MHz (1 MHz =106 /s). Wave B has wavelength λ = 2.12 × 10−10 m. Wave C has photons with energy 3.97 × 10−19 J/photon. Identify the type of radiation (e.g. x-ray, ultraviolet, visible, infrared, etc) for each of the three waves, and order them from left to right representing lowest to highest energies. 3. For each of the following pairs of atoms, state which you expect to have the higher first ionization energy: (a) Rb or Sr (b) Po or Rn (c) Se or Te 4. For each of the following pairs of atoms, state which you expect to have the higher second ionization energy: (a) Rb or Sr (b) Po or Rn (c) Ba or Ca 1 5. Do problem 4-11 from our text. 6. Do problem 4-27 from our text. 7. The speed of sound in dry air is 345.3 m/sec, and the frequency of middle C on a piano is 261.6/sec. Calculate the wavelength λ of this sound wave, and find the time required to travel acroos a 30.0 m long concert hall. 8. In 5.0 sec, a 75 watt light source emits 9.91 × 1020 photons of a single wavelength radiation. Assuming that the light source is 100% efficient, so that all 75 watts are used to produce the light, what is the color of the emitted light? 9. The minimum energy required to cause the photoelectric effect in potassium metal is 3.69 × 10−19 joules. (a) Will photoelectrons be produce when we shine green light on the surface of K metal? (b) If radiation with λ = 400 nm is shone on potassium, what is the velocity of the ejected electrons? 2 ...
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Hmwk3 - Chem2070 Homework #3: Fall 2011 Due September 16 1....

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