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109Exam 3.3-05

109Exam 3.3-05 - CHEM 109 EXAM 3 FALL 2005 – SHOW ALL...

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CHEM 109 EXAM 3 FALL 2005 – SHOW ALL WORK – NO WORK – NO CREDIT 1. (10 pts) (a) We spend quite a bit of time staring at the red and green lights in a traffic signals. While that image is in your mind, decide which would have the longer wavelength a red light with a 4.41 x 10 14 Hz frequency or a green light with a 6.00 x 10 14 Hz frequency?. (no calculation necessary, just circle your answer below) Red Green wavelength can not be determined Both are the same (b) Talking on a cell phone is possible because of the electromagnetic signals sent and received. What is the energy of one photon in a signal that is sent at 850 MHz ? ******NOTE DESIGNATED SIG DIG PROBLEM (b) & (c) ****** ___________ Joules (c) What is the energy, in kilojoules , of a one mole of photons from part b? ___________ kJ (d) To answer this question, select only one of the following observations. Name the scientist that used the observation to make new conclusions about quantized energy, and describe how explaining that selected observation helped scientists decide that energy is quantized : UV Catastrophe: Photoelectric Effect: Discontinuous Line Spectra: Make your selection by circling one of the above diagrams. Your written answer must fit inside this box: Scientist’s name: ______________________: Explanation: 2. (10pts) (a) The energy levels in atoms are often depicted as spaced lines representing the quantum energy levels. Using the following energy level diagram for an atom of hydrogen, select the transition, among these choices, that would release the largest quantum of energy. _______ n =4 _______ n =3 (i) n = 3 to n = 1; (ii) n = 4 to n = 3; (iii) n = 1 to n = 4; (iv) n = 2 to n =1 _______ n =2 (b) Compare the energy released from your selection in part (a) to the energy that would be released in a transition from n = 6 to n = 5. Circle the description of the wavelength that would make the following sentence accurate. “The amount of energy released in your choice from part (a) would have a ( longer or shorter ) wavelength when compared to the energy released from _______ n =1 a n = 6 to n = 5 transition.” (c) How much energy would be released when an excited electron in hydrogen’s n = 5 level falls to the n = 1 level?
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