Recitation 3

Recitation 3 - Fall CHEM 110

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Unformatted text preview: Fall CHEM 110 ------------------------------------------------------------------------------------------------------------------------ 1. A sodium vapor street lamp emits yellow light at wavelength = 589 nm. How much energy is released if a mole of photons are emitted? A. B. C. D. E. 2.0 105 J 5.4 108 J 7.2 1013 J 1.9 104 J 3.5 1019 J HINT 1: What is the relationship need to find the energy of a single photon? HINT 2: How many photons are in a mole of photons? ------------------------------------------------------------------------------------------------------------------------ 2. There is a red emission line at 670nm in the line spectrum of Li. What is the energy difference between the energy levels involved in the electronic transition that produces this emission line? A. B. C. D. 2.97 1019 J 6.70 107 J 4.48 1014 J 9.89 1028 J ------------------------------------------------------------------------------------------------------------------------ 3A. An emission line the hydrogen atom has a wavelength of 93.8 nm. What region in the electromagnetic spectrum is this emission found? 3B. Determine the final value of n associated with this emission? (Hint: Consider E = h and Equation below, use this to find the value of nf.) 3C. Determine the initial value of n associated with this emission. (Hint: Will this value be higher or lower than nf and why is this the case? What equation will you use to determine this value; what values do you know?) ------------------------------------------------------------------------------------------------------------------------ 4A. Which of the following electron transitions in a hydrogen atom will emit a photon, which absorb a photon? (How do you know?) A. n = 1 to n = 3 B. n = 4 to n = 3 C. n = 3 to n = 2 D. n = 3 to n = 1 E. n = 2 to n = 3 4B. Which of the above electron transitions in a hydrogen atom will result in emission of light with the longest wavelength? ------------------------------------------------------------------------------------------------------------------------ Recitation 3 Fall CHEM 110 ------------------------------------------------------------------------------------------------------------------------ 5. Use the Bohr model and determine the frequency of light that would ionize a hydrogen atom. (Hint: ionization is the removal of an electron; assume we are removing it from the n = 1 value) ------------------------------------------------------------------------------------------------------------------------ 6. Consider the rules for assigning quantum numbers. Which is not a permissible set of quantum numbers? Identify the orbital (if possible) a) n = 2, = 0, m = 0 _____ b) n = 3, = 2, m = 2 _____ c) n = 2, = 1, m = -1 _____ d) n = 3, = 3, m = 0 _____ e) n = 4, = 3, m = -3 _____ Hint: What quantum number(s) gives the electron shell? What quantum number number(s) indicate the subshell? Which quantum number(s) define the orbitals in a subshell? ------------------------------------------------------------------------------------------------------------------------7. Which of the following represents an orbital in which a 3d electron could be found? A. B. C. D. E. 1 only 2 only 4 only 1 and 5 2 and 3 ------------------------------------------------------------------------------------------------------------------------ Recitation 3 ...
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