O 2 s 2 ar na al 3 dd which of the following sketches

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O 2– S 2– Ar Na + Al 3+ dd. Which of the following sketches represents a set of sp 3 hybrids?
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Page 6 of 11 Name_______________________________ 2. (10 points; 5 points each) Use your knowledge of weak electrolytes, gas-forming reactions, and insoluble compounds to write balanced net ionic equations for each of the following, using lowest whole-number coefficients. Be sure to write any weak electrolytes or insoluble compounds in “molecular” form. a. (NH 4 ) 2 SO 4 ( aq ) + Ba(NO 3 ) 2 ( aq ) b. Na 2 CO 3 ( aq ) + CH 3 CO 2 H( aq ) 3. (8 points; 4 points each) Give the complete electronic configuration (using the usual spectroscopic notation; i.e., 1 s 2 2 s 2 ...) for the following: 34 Se 2– _______________________________________________________________________ 26 Fe 2+ _______________________________________________________________________
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Page 7 of 11 S C N Name_______________________________ 4. (12 points) The following is the principal resonance form of the thiocyanate ion: Draw Lewis structures for the two lesser contributing resonance forms (6 points), assign formal charges for each form (3 points), and name the hybrid orbitals on the carbon atom in the space below (3 points). The hybrid orbitals on the carbon atom are ______. 5. (12 points) A certain hydrocarbon with a molecular weight of 56.10 u consists of 85.63% C and 14.37 % H. What is its molecular formula? Show work to justify your answer.
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Page 8 of 11 Name_______________________________ 6. (36 points; 12 points each) For each of the following molecules or ions draw a Lewis dot diagram (5 points), draw and name the shape (3 + 2 points), and indicate whether the species is polar or nonpolar (2 points). a. H 3 O + [Lewis model] [Shape drawing] _____________________________________________ __________ (name of shape) (polar?) b. PCl 4 [Lewis model] [Shape drawing] _____________________________________________ __________ (name of shape) (polar?)
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Page 9 of 11 Name_______________________________ c. Cl 2 CO [Lewis model] [Shape drawing] _____________________________________________ __________ (name of shape) (polar?)
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Page 10 of 11 Name_______________________________ 7. (16 points) Calculate the standard enthalpy of formation of Ca(OH) 2 ( s ), given the following data: 2Ca( s ) + O 2 ( g ) 6 2CaO( s ) H o = –1271.0 kJ Ca(OH) 2 ( s ) 6 CaO( s ) + H 2 O( l ) H o = +64.9 kJ 2H 2 ( g ) + O 2 ( g ) 6 2H 2 O( l ) H o = –571.7 kJ
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