chem questions - e) indicate if the molecule is polar or...

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Review Session Questions Exam 4, Fall 2008 Prof. Mason 1) Which of the following bonds is more polar? C–H Si–H B–F 2) Show the direction of polarity in the Ge–O, Cl–I, and Ga–P bonds using δ + notation. 3) Order the following according to decreasing electronegativity: Na O S Mg 4) Based on Lewis structures, predict the order of N–O bond lengths in NO + , NO 2 , and NO 3 5) Complete the electron dot structure for the molecule below. C C C C C C H H H H
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6) Draw Lewis structures for the following organic compounds. Do not change the atom connectivity implied in the first two compounds. CH 3 CCH CH 2 CHCHCH 2 C 2 F 4 7) Draw the Lewis structure for PO 4 3– that obeys the octet rule. Indicate formal charges on all atoms. Also, draw the Lewis structure and resonance forms in which formal charges are minimized. 8) Which of the following N 2 F 2 molecules has a dipole moment? N N F F N N F F
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9) a) draw the electron-dot structure b) determine the number of electron pairs on the central atom c) give the arrangement of the electron pairs d) give the shape of the molecule
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Unformatted text preview: e) indicate if the molecule is polar or nonpolar CS 2 CH 2 Cl 2 ICl 4 TeF 5 BeCl 2 10) What are the expected FIF bond angles in IF 4 + ? Similarly, what are the expected bond angles in SiH 3 + ? 11) Arrange the following in order of decreasing lattice energy. CsI NaF CaO 12) Draw a Born-Haber cycle and calculate the lattice energy for formation of CaBr 2 (s) from the elements using the data below. Bond Dissociation Energy for Br 2 (g) 224 kJ/mol Energy to convert Br 2 (l) to Br 2 (g) 30.9 kJ/mol Electron Affinity for Br(g) 325 kJ/mol Sublimation energy for Ca(s) 178.2 kJ/mol First ionization energy for Ca(g) 589.8 kJ/mol Second ionization energy for Ca(g) 1145 kJ/mol Net reaction energy 658.1 kJ/mol Lattice energy for CaBr 2 (s) ? 13) Estimate H for the reaction below using average bond enthalpies in Table 9.4 on page 386. C 2 H 2 (g) + 5/2 O 2 (g) 2 CO 2 (g) + H 2 O(g) H = ?...
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chem questions - e) indicate if the molecule is polar or...

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