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Exam 2 - Version 164 Exam 2 Lyon(52370 This print-out...

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Version 164 – Exam 2 – Lyon – (52370) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. BE SURE YOU BUBBLE YOUR NAME, EID AND EXAM VERSION NUM- BER CORRECTLY ON YOUR ANSWER SHEET. 001 10.0 points Which of the following has the highest lattice energy? 1. CaO 2. MgO correct 3. NaCl 4. KI 5. BaO Explanation: Mg 2+ and O 2 have the highest charge den- sities. 002 10.0 points The bond angles associated with sp 3 d 2 hy- bridization are 1. 90 and 120 . 2. 109.5 . 3. 90 , 120 and 180 . 4. 120 . 5. 90 and 180 . correct Explanation: sp 3 d 2 hybridized molecules have 6 regions of HED and octahedral electronic geometry with bond angles of 90 and 180 . 003 10.0 points Which of the following statements is true? 1. The electronegativity of an atom depends only on the value of the ionization energy of the atom. 2. Atoms with high ionization energies and high electron affinities have low electronega- tivities. 3. The electronegativity of an atom is de- fined as 1 2 (Electron Affinity) of the atom. 4. Atoms with high ionization energies and high electron affinities are highly electronega- tive. correct 5. Atoms with low ionization energies and low electron affinities have high electronega- tivities. Explanation: Atoms with high ionization energies do not readily give up electrons to form positive ions. For these atoms it is usually favorable to gain electrons to form negative ions, so electron affinities and electronegativities tend to be large. In Mulliken’s scale, electronegativity = 1 2 (First Ionization Energy + Electron Affin- ity). 004 10.0 points Let X be a hypothetical element. Which of the following would be largest? 1. X 2. X 2 correct 3. X + 4. X 5. X 2+ Explanation: X 2 would be largest as it has 2 more electrons than protons, and the protons here would be at the greatest disadvantage when trying to draw the electrons towards the nu- cleus. 005 10.0 points
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Version 164 – Exam 2 – Lyon – (52370) 2 List in order of increasing atomic size (small- est to largest) the atoms whose atomic num- bers are 6, 32, 7. 1. 32, 6, 7 2. 7, 6, 32 correct 3. 6, 7, 32 4. 32, 7, 6 Explanation: Element Electronic configuration 6 2 · 4 [He] ↑↓ 2 s 2 p Group 4, Period 2 Valence electrons in period 2 7 2 · 5 [He] ↑↓ 2 s 2 p Group 5, Period 2 Valence electrons in period 2 32 2 · 8 · 18 · 4 [Ar] ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ 4 s 3 d 4 p Group 4, Period 4 Valence electrons in period 4 Period 4 is farther from the nucleus than period 2. The half-filled 2 p orbital of ele- ment #7 is energetically more stable and has greater effective nuclear charge than that of element #6. 006 10.0 points The PF 5 molecule exists, whereas NF 5 does not. Which one of the following is the BEST explanation for this fact?
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