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Unformatted text preview: Cheung, Anthony Homework 6 Due: Oct 16 2006, 5:00 pm Inst: McCord 1 This print-out should have 14 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points An antibonding orbital is formed when 1. a free electron is present in the molecule. 2. an s-orbital overlaps a p-orbital. 3. the corresponding atomic orbitals are out of phase. correct 4. a p x-orbital overlaps a p z-orbital. 5. None of these is correct. Explanation: In-phase overlap of two atomic orbitals re- sults in molecular bonding orbitals; out-of- phase overlap of two atomic orbitals results in molecular antibonding orbitals. 002 (part 1 of 1) 10 points Which of the following is TRUE about anti- bonding orbitals of the molecular orbital the- ory? 1. Unshared electrons are placed in anti- bonding orbitals. 2. Antibonding orbitals are higher in energy than their corresponding bonding orbitals. correct 3. Antibonding orbitals are made from the overlap of sigma and pi orbitals. 4. Although antibonding orbitals may ac- cept electrons, the electrons never remain for long. 5. The strongest bonds between atoms have no electrons in antibonding orbitals. Explanation: Antibonding orbitals are higher in energy than their corresponding bonding orbitals. Molecules can exist with electrons in anti- bonding orbitals, as long as the molecule does not place as many electrons in antibonding orbitals as there are in bonding orbitals....
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- Fall '07