1. Which species listed below has the largest lattice energy?
A.NaCl
B.LiCl
C.LiF
D.KBr
E.KF


2. Given the three statements below, pick the best answer.
(a) The main forces that make ionic solids stable are electrostatic in nature.
(b) The main force holding covalent molecules together is the sharing of electrons between atoms.
(c) The total number of valence electrons for CCl4 is 32.
A.a and b are true, c is false
B.a and c are true, b is false
C.b and c are true, a is false
D.all three are true
E.only c is true


3. How many electrons (both lone and bond pairs) are shown in the correct Lewis structure of HClO?
A.14
B.12
C.16
D.20
E.none of these


4. The molecule PH3 has:
A.3 bonding pairs and 1 lone pair.
B.3 bonding pairs and no lone pairs.
C.3 bonding pairs and 2 lone pairs.
D.4 bonding pairs and 1 lone pair.
E.none of these


5. Given the three Lewis structures listed below, pick the best answer.

A.a and b are correct, c is incorrect
B.b and c are correct, a is incorrect
C.a and c are correct, b is incorrect
D.all three are correct
E.only b is correct


6. Which bond would be most polar?
A.O-F
B.Cl-F
C.C-F
D.Al-F
E.B-F


7. Lewis structures for OF2, H3COH and NO+ are shown below. Pick the best answer. (Note: formal charges are circled.)

A.a and c are correct, b is not
B.b and c are correct, a is not
C.only a is correct
D.only c is correct
E.all are correct


8. Pick the correct Lewis structure shown below.

A.1
B.2
C.3
D.4
E.all 4 are incorrect


9. Which molecule listed below has a total of 10 valence electrons around the central (first) atom?
A.XeF4
B.SeCl2
C.ClF3
D.AsF3
E.none of these


10.

Given the data below, what approximately is DH for the reaction?
H2(g) + H2CCH2(g) ® H3CCH3(g)

Average Bond Energies:

H-H 436 kJ/mol

C-H 414 kJ/mol


C=C 611 kJ/mol

C-C 348 kJ/mol


A.-490 kJ
B.-392 kJ
C.+281 kJ
D.-129 kJ
E.none of these


11. The H-X-H angle is largest in which species below?
A.H2O
B.NH3
C.H2CO
D.BeH2
E.CH4


12. Given the three statements below, pick the best answer.
(a) [AlCl4]- is tetrahedral.
(b) The Cl-N-Cl angle in NCl3 is about 120°.
(c) The H-S-H angle in H2S is about 109°.
A.a and b are true, c is false
B.a and c are true, b is false
C.b and c are true, a is false
D.all three are true
E.only a is true


13. The electron pair arrangement about the chlorine atom in ClF5 is:
A.trigonal planar.
B.tetrahedral.
C.trigonal bipyramidal.
D.octahedral.
E.none of these


14. The electron pair arrangement about the phosphorus atom in PF3 is:
A.trigonal planar.
B.tetrahedral.
C.trigonal bipyramidal.
D.octahedral.
E.none of these


15. Which of the following molecules is non-polar?
A.BCl3
B.H2O
C.NCl3
D.PCl3
E.all are polar


16. Pick the one statement below that is true.
A.BF3 is polar.
B.PH3 is non-polar.
C.H2CCl2 is non-polar.
D.XeF4 is polar.
E.SO2 is polar.


17. The hybrid orbitals used by the nitrogen atom in NCl3 are:
A.sp
B.sp2
C.sp3
D.sp4
E.unhybridized


18. The hybrid orbitals used by C in Cl2CO are:
A.non-hybridized
B.sp
C.sp2
D.sp3
E.sp3d


19. How many p bonds are present in a CO2 molecule?
A.1
B.2
C.0
D.4
E.none of these


20. Pick the true statement listed below about N2O (N-N-O connectivity).
A.N2O has 2 sigma and 1 pi bond
B.N2O has 3 sigma and 1 pi bond
C.N2O has 2 sigma and 2 pi bonds
D.N2O has 2 sigma and 3 pi bonds
E.none of the above statements are true



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