111----xm2F06

111----xm2F06 - Chemistry 111 Hour Exam#2 Fall 2006-1 Name...

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-1- Name 1. (16 points) Answer each of the following questions with the best word(s), number, symbol, or response. a. The sum of oxidation numbers for all atoms in POCl 3 is b. The bond order in N 2 is c. What type semiconductor would result from doping Si with Al ? d. How many sigma and pi bonds are in one molecule of acetylene (C 2 H2) ? e. What hybrid orbital is utilized by carbon in acetylene? f. What is the coordination number of an atom in hexagonal closest pack? g. How many atoms are in a FCC unit cell ? h. Rank the size of octahedral, cubic, and tetrahedral holes in a chloride lattice. > > 2. (10 points) Calculate the wavelength of light given off when an electron in a semiconductor having a band gap of 400 kJ/mol emits photons upon relaxing to the ground state. 3. ( 8 points) What electronic geometry and molecular geometry are predicted for each of the following molecules? Compound
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This note was uploaded on 04/12/2008 for the course CHEM 109 taught by Professor Malina during the Spring '08 term at UNL.

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111----xm2F06 - Chemistry 111 Hour Exam#2 Fall 2006-1 Name...

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