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quiz5_raiders_key

quiz5_raiders_key - Chem 124 Spring 2008 Quiz#5 Raiders of...

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Chem 124 Quiz #5 Raiders of Lost Ark Dr. Retsek Spring 2008 NAME: _ KEY ______________________ Computer #: ________ (9 points, 3 points each) For the following multiple choice questions, clearly circle the best answer for each question. There is only one correct answer for each question. 1.. If the band gap is 2.2 eV, the frequency of light required to jump the band gap is 2.2 eV x 1.602 x 10 -19 J = 3.52 x 10 -19 J 1 eV E= h ν = 3.52 x 10 -19 J = (6.626 x 10 -34 J s)( ν ) ν = 5.32 x 10 14 s -1 a. 5.6 x 10 -7 s -1 b. 5.3 x 10 14 s -1 c. 3.3 x 10 33 s -1 d. none of the above 2. If the band gap of a substance is ~ 5 eV, then the material is most likely a a. insulator b. semiconductor c. conductor d. none of the above 3. Chemical bonding between metals and nonmetals primarily involve: a. interactions between protons, electrons, and neutrons b. an electron “sea” c. sharing of electrons d. transfer of electrons 4. (5 points, 1 points each) Check ( 9 ) whether the statement is true or false. Statement True False a. The valence and conduction bands are made up of atomic orbitals. Made up of molecular orbitals (atomic orbitals are for individual atoms) 9 b. The element with the electron configuration [Ar] 4s 2 3d 10 4p 4 is a metalloid or semi-metal. needs to touch two sides of the box to staircase to be metalloid
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