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Unformatted text preview: Version 164 Exam 1 Lyon (52370) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. PLEASE BE SURE THAT YOUR NAME, EID AND EXAM VERSION NUMBER ARE BUBBLED ON THE ANSWER SHEET. FAILURE TO BUBBLE THIS INFORMA- TION CORRECTLY WILL RESULT IN A ZERO AS YOUR EXAM SCORE, WHICH MAY REQUIRE A WEEK OR TWO TO RESOLVE. 001 10.0 points Which of the following is named correctly and has the correct chemical formula? 1. Ag 3 P : silver phosphide correct 2. PbS : lead(IV) sulfide 3. Zn 2 S : zinc sulfide 4. Ga 3 O 2 : gallium oxide 5. NaCl : sodium chlorine Explanation: Silver has a 1+ charge and phosphorous has 3- charge. In order to balance the charges, 3 silver atoms are need for every phosphorous atom. 002 10.0 points Calculate the wavelength of a motorcycle of mass 275 kg traveling at a speed of 125 km/hr. 1. 1.93 10- 41 m 2. 2.08 10- 29 m 3. 2.41 10- 36 m 4. 6.94 10- 38 m correct 5. 1.93 10- 38 m Explanation: v = 125 km/h = 125000 m/h m = 275 kg = h m v = 6 . 626 10- 34 J s (275 kg) parenleftbigg 125000 m 3600 s parenrightbigg = 6 . 93923 10- 38 m 003 10.0 points The photoelectric effect provided strong evi- dence for 1. the particle nature of light. correct 2. quantization of energy. 3. the wave nature of matter. 4. the wave nature of light. 5. the particle nature of matter. Explanation: When electromagnetic radiation (light) of sufficient minimum energy strikes a metal cathode, electrons are knocked off its sur- face, travel to an anode, and form a current through a circuit. Two important observations were: 1) Electrons can be ejected only if the light is sufficiently energetic. Electron ejection is independent of time or intensity. The mini- mum energy varies by element. 2) The current increases with increasing intensity and is independent of color. Therefore, light is made up of photons, each having a particular amount of energy that can be transferred to an electron during a colli- sion. If the energy is equal to or greater than the amount needed to liberate the electron, it can escape to join the photoelectric current. Intensity is the number of photons hitting a surface per unit time. 004 10.0 points Each solution to the Schrodinger wavefunc- tion equation may be described in terms of 1. ionization energies. 2. photon energies. Version 164 Exam 1 Lyon (52370) 2 3. velocity and distance. 4. photoelectric effect. 5. quantum numbers. correct Explanation: 005 10.0 points For any principal energy level in an atom, there are (1, 3, 6) p orbitals; they may contain a total of (3, 6, 12) electrons. 1. 3; 3 2. 6; 12 3. 1; 6 4. 6; 6 5. 3; 6 correct Explanation: The principle energy level is n , the subshell is , and the orbital is m . For = p = 1, m can have values- 1, 0, and 1, which is a total of 3 orbitals. Each orbital can hold 2 electrons parenleftBig designated m s = + 1 2 or- 1 2 parenrightBig for...
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This note was uploaded on 10/26/2010 for the course CH 52370 taught by Professor Lyon during the Spring '09 term at University of Texas at Austin.
- Spring '09