Question

Assignment 10, version 129 Questions 1, 2, and 5: If there are 3 elements in the molecule, the first atom is the central atom and the others are bonded to it. 1. Draw the Lewis structures for each of the following ions or molecules. For each, give (i) the molecular shape, (ii) the electron pair geometry at the central atom, and (iii) the hybridization of the central atom. (a) CIF (b) AsCl4 (C) PCI (d) AsCl3 (e) OF 2. Consider the following molecules or ions: NO CI, BrOF3, IF4, and Br20. Answer the following questions based on the Lewis structures and VSEPR theory prediction of their molecular shapes. (a) Which one has only bond angles of 109.5°? (b) Which one has only bond angles of 120°? (c) Which one has bond angles of 90 and 180°? (d) Which one has bond angles of 90, 120, and 180°? 3. Consider the four compounds NF, NCI, NBr), and NI3. Use periodic trends in bond lengths and the electronegativity table in Chang to answer the following questions: (a) Which molecule is expected to have the longest bonds? (b) Which molecule is expected to have the most polar bonds? (c) Which molecule is expected to have the least polar bonds? 4. Atom hybridization changes in many chemical reactions. In each of the following reactions, determine what change, if any, occurs to the hybridization of the underlined atom. (a) IFs + 1/2 0, -+ IOF (I is the central atom)

Answer 1

a) UF: (1) Molecular shebe : T-shaped (1) e- geometry : Trigonal dipercanidel (1) Hy ksiolisation at le: sb3d i tuo 17501 4:37 F: 6) Asli Ü: 7 li As: rü 1. (1) Molecular shape : see-saw W o-geometry on Als : tulgeral tibyseonikal (111) Hybridization : spid . c) Illy + :Ü: 74 (1) Molecular shape: Tetrahedral (11) e geomet sey on P: Tetrahedral con) nybridization on P: 183 30:9:: Ui:

d) Asllz :Ü: 1) Molecular shape: Toreigonal pyramidal w ergesretsey: Tetronethel : 0 hybu'diketi on : s83 E: AS: de: : : e) OF 2 (0) Moleu lar shape : Bent on V-shaped w e geomet sy : Tebraheel mal (0) Hybridizelion : s83 : :F: F F