Chemistry Review
Practice problems for CHE 101 final
Approximate breakdown of points:
Old
Ch. 2: 10
Ch. 3: 15
Ch. 4: 15
Ch. 5: 15
Ch. 6: 15
Ch. 7: 15
Ch. 10: 15
New
Ch. 8: 40
Ch. 9: 40
Ch. 11: 20
Final: May 3 at 11:45 am. Rooms posted on UBlearns
Check your points entered on posted grade point totals. Keep all assignments.
1) For the following molecules, give the Lewis structures, the molecular geometry, hybridization, and whether the molecule is polar or nonpolar. Where appropriate, indicate resonance structures.
A) XeF4
B) BrF3
C) CO3-2
2) Give Lewis structures for the following. Use formal charges to determine the best ones.
A) NCO-
B) ClO3-
2. The molecular geometry of the hydronium cation (H3O+) is …?
A. trigonal B. trigonal pyramidal C. tetrahedral D. trigonal bipyramidal E. bent triatomic
3. Based upon its Lewis structure, how many σ- (“sigma”) and π- (“pi”) bonds are present in the molecule C2H3Cl ?
A. 3 σ and 1 π B. 3 σ and 2 π C. 4 σ and 1 π D. 5 σ and 1 π E. 5 σ and 2 π
Also: what types of orbital overlaps occur for formation of bonds?
sp2 hybrid orbitals on carbon with s orbitals of hydrogen or sp3 orbital of chlorine, sp2 hybrid orbitals between carbons form sigma bonds leftover p orbitals on each carbon form a pi bond.
4. Consider the following species – BF4 - , SiH4 , PCl4+ , PCl4- , NF3 , NO2- . In which of these does the central atom violate the “octet rule”?
A. PCl4+ , PCl4- , NF3 & NO2- B. BF4 - , SiH4 , PCl4+ C. PCl4+ , PCl4- , NF3 D. PCl4- E. PCl4+ , PCl4- & NO2-
5. Consider the following species SnO2 , O3 , CO32_ , NH3 , ICl4- Which of these have a net molecular dipole moment?
A. All of them B. O3 , CO32- & NH3 only C. O3 , NH3 & ICl4 only D. SnO2, O3 & NH3 only E. O3, NH3 only
6. According to Molecular-Orbital
Approximate breakdown of points:
Old
Ch. 2: 10
Ch. 3: 15
Ch. 4: 15
Ch. 5: 15
Ch. 6: 15
Ch. 7: 15
Ch. 10: 15
New
Ch. 8: 40
Ch. 9: 40
Ch. 11: 20
Final: May 3 at 11:45 am. Rooms posted on UBlearns
Check your points entered on posted grade point totals. Keep all assignments.
1) For the following molecules, give the Lewis structures, the molecular geometry, hybridization, and whether the molecule is polar or nonpolar. Where appropriate, indicate resonance structures.
A) XeF4
B) BrF3
C) CO3-2
2) Give Lewis structures for the following. Use formal charges to determine the best ones.
A) NCO-
B) ClO3-
2. The molecular geometry of the hydronium cation (H3O+) is …?
A. trigonal B. trigonal pyramidal C. tetrahedral D. trigonal bipyramidal E. bent triatomic
3. Based upon its Lewis structure, how many σ- (“sigma”) and π- (“pi”) bonds are present in the molecule C2H3Cl ?
A. 3 σ and 1 π B. 3 σ and 2 π C. 4 σ and 1 π D. 5 σ and 1 π E. 5 σ and 2 π
Also: what types of orbital overlaps occur for formation of bonds?
sp2 hybrid orbitals on carbon with s orbitals of hydrogen or sp3 orbital of chlorine, sp2 hybrid orbitals between carbons form sigma bonds leftover p orbitals on each carbon form a pi bond.
4. Consider the following species – BF4 - , SiH4 , PCl4+ , PCl4- , NF3 , NO2- . In which of these does the central atom violate the “octet rule”?
A. PCl4+ , PCl4- , NF3 & NO2- B. BF4 - , SiH4 , PCl4+ C. PCl4+ , PCl4- , NF3 D. PCl4- E. PCl4+ , PCl4- & NO2-
5. Consider the following species SnO2 , O3 , CO32_ , NH3 , ICl4- Which of these have a net molecular dipole moment?
A. All of them B. O3 , CO32- & NH3 only C. O3 , NH3 & ICl4 only D. SnO2, O3 & NH3 only E. O3, NH3 only
6. According to Molecular-Orbital