midterm2_practice

midterm2_practice - most stable. If a structure is...

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1 Naming compounds Provide the systematic name of the following compounds: 1. AlI 3 : 4 points 2. HClO 3 : 4 points 3. Cr(MnO 4 ) 2 : 4 points 2 Electronegativity and polarity a Rank the following elements from smallest to largest electronegativity: Mg, S, Si, Cl. Answer: 5 points b Rank the following bonds from smallest to largest polarity: Al-Br, Cl-Br, P-Br Answer: 5 points c Does XeF 4 contain any polar bonds? Does the molecule have a net dipole moment? Explain your answer. Answer: 5 points 1
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3 Lewis structures Draw the most stable Lewis structure for the following compounds and indicate the formal charge on each atom. a HCOOH (7 points) b (CH 3 ) 2 OBH 3 (7 points) 4 VSEPR and valence bond theory For each of the following compounds, give the hybridization of the central atom and write down the electron geometry and molecular geometry. Discuss any deviations from ideal bond angles. a SO 2 Cl 2 (8 points) b I - 3 (8 points) 2
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5 Resonance Rank the following resonance structures in order of stability, with the highest number being the
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Unformatted text preview: most stable. If a structure is completely wrong, give it a ranking of 0. Some structures may have equal stability and therefore will have the same ranking. Although not indicated, note that all structures have a total charge of 2-. Explain your answer. CO 2-3 (7 points) 6 Lattice enthalpy and bond enthalpy a Use the bond energies to predict H for the combustion of one mole of acetylene: C 2 H 2 ( g ) + 5 2 O 2 ( g ) 2 CO 2 ( g ) + H 2 O ( g ) Answer: 8 points b Is the reaction above endothermic or exothermic? Answer: 4 points 3 7 Organic molecules a Draw the Lewis structure for this molecule. (8 points) (CH 3 ) 3 CCOOH b Write the molecular formula for this molecule. (8 points) c Draw the line structure for the following molecule: (8 points) CH 3 (CH 2 ) 4 CHCl 2 4...
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midterm2_practice - most stable. If a structure is...

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