problem set exam 3

problem set exam 3 - CHM 114A/C, Fall 2007 Pam Marks...

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Unformatted text preview: CHM 114A/C, Fall 2007 Pam Marks Preparation for Exam 3 Chapters 9, 10, 11, 12, and 13 Potentially useful information: K = C + 273.15 Avogadros Number = 6.022 x 10 23 particles/mole E = q + w H rxn = n H f (products) - n H f (reactants) q = ( Sp. Heat) m T (Specific Heat water = 4.184 J/g C) 2 2 8 34 18 1 1 ( ) (De Broglie's Equation) Constants: 3.00 10 / 6.63 10 2.18 10 photon H i f H c v hc E hv E R n n h m c x m s h x J s R x J -- = = = =- = = = = Activity Series Li (Most Active) K Ba Ca Na Mg Al Zn Fe Cd Ni Sn Pb H Cu Hg Ag 1 1 2 2 1 1 2 2 1 2 2 1 0.08206 / PV PV n T n T R L atm K mol PV nRT r MM r MM = = = = RT mu KE 2 3 2 2 1 = = Chapter 9: Geometry 1. Determine the electron-domain geometry and molecular shape (geometry) for any molecule or ion. i) which of the following molecule has a trigonal planar molecular shape . (a) CO (b) CF 4 (c) CO 3 2- (d) NH 3 ii) what is the parent structure and molecular shape for ClO 3- , respectively? (a) trigonal planar and trigonal planar (b) trigonal planar and bent (c) tetrahedral and trigonal pyramidal (d) tetrahedral and tetrahedral (e) tetrahedral and bent 2. Give approximate bond angles and predict how angles may deviate (larger or smaller) from these approximate values. Draw the Lewis Structure of water. What is the parent structure? What is the molecular shape? What approximate angle(s) do you expect for the molecular shape? 3. Identify a molecule as being polar or nonpolar. Define molecular polarity. i) Which of the following molecules is polar? (a) BCl 3 (b) SiF 4 (c) H 2 S (d) CO 2 ii) For an ABn type of molecule, indicate which of the following molecular geometries would be result in a polar molecule and which would be non-polar: Trigonal planar Tetrahedral Trigonal pyramidal Bent T-shape Linear Square planar Octahedral Trigonal bipyramidal 4. Determine the hybridization for all central atoms in a molecule Valence Electron Pair Geometry Number of Orbitals Hybrid Orbitals Linear 2 Trigonal Planar 3 Tetrahedral 4 Trigonal Bipyramidal 5 Octahedral 6 H 2 O Hybridization Involving d Orbitals Atoms in the third period and higher can utilize d orbitals to form hybrid orbitals PF 5 i) What is the electron pair geometry (EPG) for a central atom with sp 3 d hybridization? (a) Linear (b) Octahedral (c) Tetrahedral (d) Trigonal bipyramidal (e) Trigonal planar ii) For the following molecules, specify the hybrid orbitals of the central atom: AsF 5 2- , CCl 4 AsF 5 2- CCl 4 iii) Draw a Lewis Structure for the ammonium ion (NH 4 + ). Draw an orbital diagram to indicate the hybrid orbitals for the central Nitrogen iv) Draw the Lewis Structure for the SCl 5- ion. Draw an orbital diagram to indicate the hybrid orbitals for the central Sulfur 5. Determine the number of sigma and pi bonds in a molecule. How do and bonds differ? Which types of orbitals are used for each?...
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problem set exam 3 - CHM 114A/C, Fall 2007 Pam Marks...

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