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Unformatted text preview: Version 009 Exam 1 Lyon (52380) 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 The three quantum numbers for an electron in a hydrogen atom in a certain state are n = 4, = 1, m = 1. The electron is located in what type of orbital? 1. 4 p correct 2. 3 p 3. 3 d 4. 4 d 5. 4 s Explanation: The notation is n , where n = 1 , 2 , 3 , 4 , 5 , ... , = 0 , 1 , 2 , ..., ( n- 1) represented as a letter: 0 1 2 3 4 5 etc. orbital s p d f g h and m =- ,- ( - 1) ,- ( - 2) , ..., , ..., +( - 2) , +( - 1) , . The value of m is not needed to determine the orbital type, as long as it is valid. 002 10.0 points Experimental support for the idea that the electrons in atoms are arranged in distinct energy levels is based primarily upon 1. Daltons atomic theory. 2. the observation of line spectra from gas discharge tubes. correct 3. observation of diamagnetic behavior. 4. the law of conservation of energy. 5. Rutherfords gold foil experiment. Explanation: When an electric discharge passes through a gas discharge tube, some of the gas atoms are energized. These excited atoms give off energy as light. If we pass this light through a slit and prism, we observe only a few images of the slit. These images appear as narrow colored lines separated by dark regions. Each line corresponds to electromagnetic radiation of a specific energy and wavelength. Each line also corresponds to a specific transition that an electron may undergo within the atom. Since each element has a unique line spectrum that is always repeated, each atom must have electrons arranged in distinct energy levels. 003 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. 1; 6 2. 6; 12 3. 6; 6 4. 3; 6 correct 5. 3; 3 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 a total of 6 electrons per subshell. 004 10.0 points Which of the following is named correctly and has the correct chemical formula? 1. Zn 2 S : zinc sulfide Version 009 Exam 1 Lyon (52380) 2 2. PbS : lead(IV) sulfide 3. Ag 3 P : silver phosphide correct 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....
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This note was uploaded on 01/30/2010 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.
- Spring '07