MODULE 3

Ch. 8

100

How many electrons are in the 3p subshell of phosphorus?

3

200

7. Arrange the following ions in order of decreasing ionic radius:

Ca²⁺, K⁺, S²⁻, P³⁻

decreasing radius →

E) P³⁻ > S²⁻ > K⁺ > Ca²⁺

300

9. Which of the following atoms has the greatest electron affinity (largest negative value)?

A) O

B) F

 C) Al

 D) Na

 E) Cl

B) F

400

10. The following successive ionization energies correspond to an element in the third row of the periodic table:

• I₁ = 578 kJ/mol
• I₂ = 1,815 kJ/mol
• I₃ = 2,740 kJ/mol
• I₄ = 11,600 kJ/mol
• I₅ = 14,800 kJ/mol
• I₆ = 18,500 kJ/mol

Based on this pattern of ionization energies, identify the element.

a. magnesium 

b. silicon

c. aluminum

d. phosphorus 

e. none of the above

c. aluminum

Ch. 9

100

5. Arrange the elements Ba, Br, and Ga in order of increasing electronegativity.

C) Ba <Ga <Br

200

10) The total number of valence electrons in the compound NH4 NO3 is

A) 28.

B) 30.

C) 32.

D) 42.

E) 80.

C) 32.

300

27) Which of the following solids would have the highest melting point?

A) NaI

B) NaF

C) MgO

D) MgCl2

E) KF

C) MgO

400

29) Use the bond enthalpy data given to estimate the heat released when 25.0 g of acetylene gas, C2H2 , burns in excess

oxygen to yield carbon dioxide and water vapor at 25°C, 

[C2H4 + 3O2 → 2CO2 + 2H2O]

BE(C–C) = 347 kJ/mol

BE(C≡C) = 812 kJ/mol

BE(C=O in CO2 ) = 799 kJ/mol

BE(C–H) = 414 kJ/mol

BE(O–H) = 460 kJ/mol

BE(O=O) = 498.7 kJ/mol

D) 1180 kJ

Ch. 10

100

8) The geometry of the SF4 molecule is 

 

E)  distorted tetrahedron (seesaw).

200

13) According to VSEPR theory, which one of the following species has a tetrahedral geometry? 

 A)  IF4+ 

 B)  IF4–

C)  PCl4+

 D)  PCl4–

 E)  SeF4

C)  PCl4+

300

21) Predict the geometry and polarity of the CS2 molecule. 

 

B)  linear, nonpolar

400

22) Which of the following species has the largest dipole moment (i.e., is the most polar)?

A) CH 4

B) CH 3 Br

C) CH 3 Cl

D) CH 3 F

E) CH 3 I

D) CH 3 F

Ch.11

100

26)    Which type of intermolecular force is the strongest? (ionic, ion-dipole, dipole-dipole, hydrogen bonding, dispersion)    
    A)    Dispersion    
    B)    Dipole-dipole
    C)    Ion-dipole
    D)    Hydrogen bonding
    E)    Ionic

   E)    Ionic

200

9)    Which of the following would be expected to have the highest vapor pressure at room temperature?    
    A)    ethanol, bp = 78°C    
    B)    methanol, bp = 65°C
    C)    water, bp = 100°C
    D)    acetone, bp = 56°C

    D)    acetone, bp = 56°C

300

17)    Of the following, which is the dominant (strongest) type of intermolecular force present in RbCl(s)?    
    A)    Dispersion    
    B)    Dipole-dipole
    C)    Ion-dipole
    D)    Hydrogen bonding
    E)    Ionic

    E)    Ionic

400

8)    The intermolecular forces present in HSCH2CH2SH include which of the following?  
I. dipole-dipole  
II. ion-dipole  
III. dispersion  
IV. hydrogen bonding    
    A)    I, II, III, and IV    
    B)    I and III
    C)    I, III, and IV
    D)    I and II
    E)    II and IV

    B)    I and III