Name: ______________________________
AP Chemistry
Exam #2
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Question 1-3 refer to the following pairs of elements.
A. Be and B
B. P and S
C. Cl and F
D. Cr and Mo
E. Au and Ag
1. Show a reversal in the trend for first ionization energy because of electronelectron repulsion.
2. Show a reversal in the trend for first ionization energy because of shielding by full
orbitals.
3. Exhibit an anomaly in the outer electron configuration due to filling of d orbitals.
Questions 4-8 refer to the following elements:
A.
B.
C.
D.
E.
4.
5.
6.
7.
8.
Na
Mg
O
S
N
Is the most electronegative.
exhibits the most number of oxidation states.
has the largest atomic radius.
has the smallest atomic radius for its most common ion.
has the largest difference between first and second ionization energy.
For each, select the best answer from the choices immediately below each question.
9. Which of the following intermolecular forces are found in all substances?
(A) dipersion
(B) dipole-dipole
(C) hydrogen bonding
(D) ion-dipole
(E) covalent
10. Which of these substances can form hydrogen bonds within their pure liquids?
I. CH3NH2
II. (CH3)2C = O
III. CH3OH
IV. CH3OCH3
(A) I, II, III, IV
(B) I, II, III only
(C) II only
(D) I, II only
(E) I, II, IV only
11. What is the correct order of boiling points, lowest to highest, for these liquids?
(A) CH3CH2CH3 < CH3CH2OH < H2O
(B) CH3CH2OH < CH3CH2CH3 < H2O
(C) H2O < CH3CH2CH3 < CH3CH2OH
(D) CH3CH2CH3 < H2O < CH3CH2OH
(E) CH3CH2OH < H2O < CH3CH2CH3
12. What volume of 0.500 M AlCl3 solution is needed to prepare 300 ml of a solution
that has a chloride concentration of 0.300 M?
(A) 30.0 ml
(B) 50.0 ml
(C) 60.0 ml
(D) 120 ml
(E) 180 ml
13. Formulas of five compounds of a particular ion “X” are listed below. Which of
them must be incorrect?
(A) X2O3
(B) X2(CO3)3
(C) XPO4
(D) XCl3
(E) X3N
14. How many unpaired electrons are found in the most stable electronic state of a
sulfur atom?
(A) 0
(B) 1
(C) 2
(D) 4
(E) 6
15. Which molecule has the strongest bond?
(A) CO
(B) O2
(C) NO
(D) F2
(E) Cl2
16. Which molecule has the shortest bond length?
(A) N2
(B) O2
(C) Cl2
(D) Br2
(E) F2
17. Which molecule has the longest bond length?
(A) F2
(B) Cl2
(C) Br2
(D) I2
(E) N2
18. For SF4, the molecular geometry is:
(A) trigonal planar
(B) trigonal bipyramidal
(C) see-saw
(D) T-shape
(E) Tetrahedral
19. Which is (are) planar?
I. NO3- II. SO3 III. CO32- IV. SO32(A) I only
(B) III only
(C) I, II, III only
(D) I, III, IV only
(E) All are planar
20. A bond angle commonly found in molecules having a central atom that is sp3
hybridized is:
(A) 180
(B) 120
(C) 109.5
(D) 90
(E) 75
21. Which molecule would have a bond angle that deviates most from that predicted
by VSEPR?
(A) CH4
(B) NH3
(C) H2O
(D) CH3F
(E) CO2
22. Which substance will have the highest melting point?
(A) HBr
(B) LiBr
(C) CaBr2
(D) SBr4
(E) Br2
23. Which substance will have the highest boiling point?
(A) CH3CH2CH2CH3
(B) CH3CH2CH2CH2F
(C) CH3CH2CH2CH2Cl
(D) CH3CH2CH2CH2Br
(E) CH3CH2CH2CH2I
24. Which atom is least likely to covalently bond?
(A) Na
(B) Al
(C) C
(D) Cl
(E) S
25. If 1.0 ml of a stock solution that is 1.0 M Na+ is added to a flask and then water is
added to reach a total volume of 100.0 ml, what is the Na+ concentration of the
resulting solution?
(A) 0.0010 M
(B) 0.010 M
(C) 0.10 M
(D) 1.0 M
(E) 10.0 M