Practice Questions
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| 1. |
An
element consists of three isotopes in the relative abundance given
below. What is the atomic mass of this element? |
|
30.00% = 40.00 amu
50.00% = 41.00 amu
20.00% = 42.00 amu |
| (A) |
40.90 |
| (B) |
41.00 |
| (C) |
41.90 |
| (D) |
42.20 |
| (E) |
42.90 |
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| 2. |
The total
number of electrons that can be accommodated in the fourth principal
energy level is _____ |
| (A) |
2 |
| (B) |
8 |
| (C) |
18 |
| (D) |
32 |
| (E) |
50 |
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| 3. |
If the set
of quantum numbers n = 3, l =
1, ml =
0, ms =
±1/2 represents the last electron to be added to complete the ground
state electron configuration of an element, which one of the following
could be the symbol for the element? |
| (A) |
Na |
| (B) |
Si |
| (C) |
Th |
| (D) |
V |
| (E) |
Zn |
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| 4. |
Which element
has the following electron configuration? |
|
1s22s22p63s23p64s23d4 |
| (A) |
Cr |
| (B) |
Mn |
| (C) |
Mo |
| (D) |
S |
| (E) |
Se |
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| 5. |
Complete
the balanced equation below. The missing term is |
|
|
| (A) |
 |
| (B) |
 |
| (C) |
 |
| (D) |
 |
| (E) |
 |
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| 6. |
Oxygen-15
has a half-life of 9.98 minutes. How much of a 20.0 g sample of
oxygen-15 remains after 60.0 minutes? |
| (A) |
0.156 g |
| (B) |
0.312 g |
| (C) |
0.625 g |
| (D) |
1.25 g |
| (E) |
2.50 g |
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| 7. |
Which of
the following atoms would have the largest second ionization energy? |
| (A) |
Mg |
| (B) |
Cl |
| (C) |
S |
| (D) |
Ca |
| (E) |
Na |
|
|
Statement I |
| Statement
II |
| 8. |
Hydrogen has a lower ionization energy than
does helium. |
BECAUSE | Hydrogen bonds
with halogens to form polar covalent bonds. |
|
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| 9. |
Order
the elements S, Cl, and F in terms of increasing atomic radii. |
| (A) |
S, Cl, F |
| (B) |
Cl, F, S |
| (C) |
F, S, Cl |
| (D) |
F, Cl, S |
| (E) |
S, F, Cl |
|
|
Statement I |
| Statement
II |
| 10. |
The second ionization energy of B is higher
than that of Be. |
BECAUSE | The second electron
to be removed from B and Be comes from the same principal energy
level. |
| 11. |
Oxygen has a smaller first ionization energy
than fluorine. |
BECAUSE | Oxygen
has a higher Zeff value
than does fluorine. |
|
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| 12. |
Removing
an electron from sodium is an _____ process and removing an electron
from fluorine is an _____ process. |
| (A) |
Endothermic, exothermic |
| (B) |
Exothermic, endothermic |
| (C) |
Endothermic, endothermic |
| (D) |
Exothermic, exothermic |
| (E) |
More information is needed |
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| 13. |
Which
numbered response lists all the molecules below that exhibit resonance
and none that do not? |
|
I. AsF5
II. HNO3
III. SO2
|
| (A) |
I only |
| (B) |
II only |
| (C) |
II and III |
| (D) |
III and IV |
| (E) |
I, II, and III |
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| 14. |
The sulfur
hexafluoride molecule is nonpolar and contains no lone (unshared)
electron pairs on the sulfur atom. Which answer choice lists all
of the bond angles contained in sulfur hexafluoride? |
| (A) |
120º |
| (B) |
180º |
| (C) |
90º and 180º |
| (D) |
90º, 120º, and 180º |
| (E) |
109.5º |
|
|
Statement I |
| Statement
II |
| 15. |
Molecules that contain a polar bond are
not necessarily polar compounds. |
BECAUSE | If polar bonds
in a molecule are symmetrically arranged, then their polarities
will cancel and they will be nonpolar. |
| 16. |
The NH3 molecule
is more polar than the NF3 molecule. |
BECAUSE | Fluorine atoms
are larger than hydrogen atoms. |
|
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| 17. |
Which
one of the following molecules is octahedral? |
| (A) |
BeCl2 |
| (B) |
SeF6 |
| (C) |
BF3 |
| (D) |
PF5 |
| (E) |
CF4 |
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| 18. |
Which molecule
is incorrectly matched with the molecular geometry? |
| Molecule |
Molecular geometry |
| (A) |
SF6 |
octahedral |
| (B) |
CH4 |
tetrahedral |
| (C) |
SO3 |
trigonal planar |
| (D) |
SeCl4 |
tetrahedral |
| (E) |
PH3 |
trigonal pyramidal |
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