Download CHEMISTRY 113 EXAM 3(A)

Summer 2003
CHEMISTRY 113
EXAM 3(A)
1. Specify radiation with the greatest energy from the following list:
A. ultraviolet
B. gamma
C. infrared
D. radio waves
2. The photoelectric effect is:
A. reflection of light by metal surface
B. ejection of electrons by a metal when struck by light
C. acceleration of electrons in vacuum by the electric field
D. effect of the electric field on the emission of light
3. The frequency of electromagnetic radiation required to promote an electron from n=2 to n=5
in a Bohr atom is:
A. 6.5 x 1019 Hz
B. 6.9 x 1014 Hz
C. 1.2 x 1015 Hz
D. 4.0 x 1019 Hz
4. According to the Heisenberg uncertainty principle, it is impossible to know precisely both the
position and
A. mass
B. momentum
C. color
D. velocity
5. Specify the number of possible values for the magnetic quantum number in 5d subshell
A. 6
B. 5
C. 3
D. 2
6. The ground-state configuration of Ti is:
A. [Ar]4s23d3
B. [Ar]4s13d4
C. [Ar]4s23d2
D. [Ar]4s03d4
7. Specify the number of orbitals in the shell with the principal quantum n=3:
A. 8
B. 18
C. 3
D. 9
8. Which sketch represents an orbital with the quantum numbers n = 4, l = 2
A.
B.
C.
D.
9. The electronic configuration of S2- ion is:
A. [Ne]
B. [Ar]
C. [Ne]2s2
D. [Ar]3s1
10. The effective charge acting on the valence electrons of S is:
A. +3
B. -2
C. +6
D. +1
11. The atomic radius of main-group elements generally increases:
A. down the group
B. across the period
C. between metals and non-metals
D. when the element is ionized
12. Which of the following atoms has the largest atomic radius:
A. S
B. Cl
C. P
D. Si
13. Which of the following atoms has the highest second ionization energy?
A. Mg
B. Si
C. Na
D. Al
14. How many hydrogen atoms must bound to Si to give it an octet of valence electrons?
A. 2
B. 3
C. 4
D. 1
15. The chloride of which of the following ions should have the greatest lattice energy?
A. K
B Na
C. Cs
D. Li
16. For which of the following atoms does the Lewis symbol have two unpaired electrons?
O
F
N
Ne
A. Ne
B. F
C. O
D. N
17. Using the electronegativity table specify which bond is most polar
A. HBr
B. HI
C. HF
D. CO
18. In the molecule below, which atom has the largest partial negative charge?
Cl

F C I

Br
A. Cl
B. F
C. Br
D. I
19. From the list below specify the central atom that violates the octet rule:
A. ClF3
B. SO3
C. CCl4
D. CO2
20. Using the table of bond dissociation energies, the ∆H for the following reaction is (in kJ):
H-C≡C-H + H-I →H2C=CHI
A. 506
B. -931
C. –129
D. -506
EXAM 3(B)
1. Specify radiation with the shortest wavelength from the following list:
A. gamma
B. infrared
C. ultraviolet
D. microwave
2. The photoelectric effect is:
A. reflection of light by metal surface
B. ejection of electrons by a metal when struck by light
C. acceleration of electrons in vacuum by the electric field
D. effect of the electric field on the emission of light
3. The frequency of electromagnetic radiation required to promote an electron from n=2 to n=4
in a Bohr atom is:
A. 4.1x10-19 Hz
B. 6.2x1014Hz
C. 8.2x1014Hz
D. 4.1x1019Hz
4. According to the Heisenberg uncertainty principle, it is impossible to know precisely both the
position and
A. momentum
B. shape
C. mass
D. color
5. Specify the number of possible values for the magnetic quantum number in 4f subshell
A. 7
B. 5
C. 3
D. 6
6. The ground-state electron configuration of Fe is:
A. [Ar]4s23d5
B. [Ar]4s03d7
C. [Ar]4s23d6
D. [Ar]4s13d7
7. Specify the number of orbitals in the shell with the principal quantum n=3:
A. 18
B. 9
C. 3
D. 8
8. Which sketch represents an orbital with the quantum numbers n = 4, l = 2
A.
B.
C.
D.
9.
The electronic configuration of N3- ion is:
A [Ne]
B. [Ar]
C. [Ne]2s2
D. [He]2s2
10. The effective charge acting on the valence electrons of Si is:
A. +2
B. -2
C. +4
D. +1
11. The atomic radius of main-group elements generally increases:
E. across the period
F. when the element is ionized
G. down the group
H. between metals and non-metals
12. Which of the following atoms has the largest atomic radius:
A. Cl
B. S
C. Si
D. P
13. Which of the following atoms has the highest second ionization energy?
A. Si
B. Mg
C. Al
D. Na
16. How many hydrogen atoms must bound to Si to give it an octet of valence electrons?
A. 1
B. 2
C. 4
D. 3
17. The chloride of which of the following ions should have the greatest lattice energy?
A.
K
B.
Na
C.
Cs
D.
Li
16. For which of the following atoms does the Lewis symbol have two unpaired electrons?
O
F
N
Ne
E. Ne
F. F
G. O
H. N
17. Using the electronegativity table specify which bond is most polar
E. HBr
F. HI
G. HF
H. CO
18. In the molecule below, which atom has the largest partial negative charge?
Cl

F C I

Br
A. Cl
B. F
C. Br
D. I
19. From the list below specify the central atom that violates the octet rule:
A. CCl4
B. SO3
C. CO2
D. ClF3
20. Using the table of bond dissociation energies, the ∆H for the following reaction is (in kJ):
H-C≡C-H + H-I →H2C=CHI
A.
–129
B.
506
C.
–506
D.
-931