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Unformatted text preview: padilla (tp5647) – Homework 6 – Sutcliffe – (53770) 1 This print-out should have 26 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Bonding orbitals 1. hold non-bonding electrons. 2. are filled after anti-bonding orbitals. 3. are lower in energy than anti-bonding orbitals correct 4. are less stable than anti-bonding or- bitals. 5. hold all valence electrons. Explanation: Bonding orbitals are lower in energy and more stable than anti-bonding orbitals. 002 10.0 points Which of the following is TRUE about non- bonding orbitals of the molecular orbital the- ory? 1. Nonbonding orbitals give added stability to the molecule. 2. Nonbonding orbitals do not overlap other atomic orbitals. correct 3. Shared electrons are placed in nonbonding orbitals. 4. Nonbonding orbitals are made from the overlap of bonding and antibonding orbitals. 5. Nonbonding orbitals are higher in energy than their corresponding bonding orbitals. Explanation: Nonbonding orbitals maintain the charac- teristics of the original atomic orbitals. They are not molecular orbitals and do not arise from the overlapping of atomic orbitals. 003 10.0 points Which of the following statements is true about a molecule with a bond order of one? 1. The molecule has a single bond. correct 2. Two side-by-side p orbitals combine to form pi bond and pi antibond orbitals; there- fore the bond order is 1. 3. The molecule is as stable as molecules with bond orders of two and three. 4. The molecule has no electrons in anti- bonding orbitals. Explanation: The bond order corresponds to the number of bonds between two atoms. 004 10.0 points The bond order 1. shows the bond strength in the absence of anti-bonds. 2. can range from two to six for a diatomic molecule. 3. can be calculated after placing the bond- ing and nonbonding electrons on a molecular orbital ladder. 4. relates to the hybridization of the molecule. 5. reflects the net bond strength of a molecule. correct Explanation: The higher the bond order the stronger the bond. 005 10.0 points A node on an antibonding molecular orbital 1. is the region in which the probability of finding an electron is zero. correct 2. always passes through the atomic nu- padilla (tp5647) – Homework 6 – Sutcliffe – (53770) 2 cleus. 3. is the region in which the probability of finding an electron is the highest. 4. only exists for a σ ⋆ 1 s . Explanation: The electron density is zero in the nodal plane of antibonding molecular orbitals. /* If you use any of these, fix the comment symbols. 006 10.0 points Simple molecular orbital theory predicts at least the transient existence of which of the species Li 2 , B 2 , C 2 , N 2 , Ne 2 in the gas phase?...
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This note was uploaded on 02/03/2009 for the course CH 301 taught by Professor Sutcliffe during the Spring '08 term at University of Texas-Tyler.
- Spring '08