chem exam 2 review

chem exam 2 review - Qs for Exam 2, CHM 2045 1. The...

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Sheet1 Page 1 Q& s for Exam 2, CHM 2045 1. The following electron transition for the H atom which is most exothermic is (1) n = 2 . n = 5 (2) n = 8 . n = 4 (3) n = 25 . n = 8 (4) n = 9 . n = 3 (5) n = 3 . n = 31 2. Of the following, the atom with the largest radius is (1) Ba (2) Ar (3) Ag (4) Te (5) Au 3. In order of decreasing radius, the species Ar, Cl-, and K+ are correctly arranged as (1) Ar < Cl- < K+ (2) Cl- <Ar <K+ (3) K+ <Ar <Cl- (4) Cl- < K+ <Ar (5) Ar <Cl- <K+
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Sheet1 Page 2 in order of decreasing radius, the species Ar, Cl - and K+ are correctly arranged as Ne, O2, Al3+, Na+1, F-, Mg+2, N-3, (large s all have same e- config. . all look like neon. .. therefore N, O, F all get bigger and Mg, Na, and Al all get smaller. . trend doesnt c h 4. Identify the following species which must be paramagnetic. no electrons paired. . or the least amount of e- paired together . ... diamagnetic is when all the e- are paired or one with most p (1) N2 (2) N2+ (3) NO2- (4) N2O2 (5) N2O ( 5. The molecular geometry of O3XeCl2 is (1) trigonal bipyramidal (2) square pyramidal (3) octahedral (4) see-saw (5) distorted tetrahedral 6. The N-to-O bond order in NO2+ is (1) 1.0 (2) 1.5 (3) 2.0 (4) 2.5 (5) 3.0
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Sheet1 Page 3 7. If each Cl-to-O bond for the chlorate ion, ClO3-, has a bond order of 1.0, the formal charge on the central atom in ClO3- is (1) +1 (2) -1 (3) +2 (4) +1/2 (5) 0 8. Identify the following molecule that is nonpolar. (1) AsF5 (2) IF5 (3) SeF4 (4) SiF2Cl2 (5) XeF3Cl
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Sheet1 Page 4 9. Based on valence bond theory, what are the hybrid orbitals for the central atom in the IF2- anion? (1) sp3d2 (2) sp (3) sp2 (4) sp3 (5) sp3d 10. The second ionization energy for O2- is equal in energetic magnitude to the first electron affinity for which of the following? (1) O2+ (2) O2- (3) O (4) O+ (5) O- 11. The number of possible geometries (shapes) for a species with a
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Sheet1 Page 5 single central atom that is sp3d-hybridized is (1) two (2) six (3) four (4) eight (5) one 12. Based on acceptable Lewis structure analysis, which of the following species has the weakest N-to-O covalent bond? (1) NO2+ (2) NO+ (3) NO3- (4) NO2- (5) NO-
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Sheet1 Page 6 13. Identify the following species which does not exhibit resonance. (1) NO2+ (2) CO32- (3) NO3- (4) NO2- (5) SO32- 14. What is the number of bond angles which are at least slightly different for the HCBrF2 molecule? (1) four (2) two (3) six (4) three (5) five Chapter 9 1. Which of the following bonds is the most polar? (1) H-Br (2) N-H (3) N-O (4) P-Cl (5) C-C electronegativity difference. .. 1) H=2.1, B=2.5 2) N=3.0 H=2.1 3) O=3.5 N=3.0 4) 2.0 and 3.0 5) 2.5 and 2.5
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Sheet1 Page 7 put fingers on pairs and find where fingers get farther apart. hydrogen needs to be put above C and N on the periodic table fo r --> farther away fingers get more polar it is . .... O=3.5, F=4, Cl=3.0 2. The sulfur-to-nitrogen bond in F3SN is a (1) single bond (2) double bond (3) triple bond (4) Lewis bond (5) sulfur is not directly bound to nitrogen in this molecule
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chem exam 2 review - Qs for Exam 2, CHM 2045 1. The...

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