General Organic And Biological Chemistry 2nd Edition By Laura D. Frost- Test Bank
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Sample Test
Chapter 3: Ionic and Covalent Compounds
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1. |
Which is not an
ionic compound? |
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A)
KCl B) Ca(NO3)2 C) CBr4 D)
AlBr3 |
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Ans: C
Difficulty: Easy |
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2. |
Which is not a
covalent compound? |
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A) |
Br2 |
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B) |
NO2 |
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C) |
NH3 |
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D) |
NaNO2 |
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E) |
More than one of the
compounds above is not a covalent compound. |
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Ans: D
Difficulty: Easy |
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3. |
In bonding, main group elements
_____ to attain the electronic configuration of the noble gas closest to them
in the periodic table. |
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A) |
Gain electrons |
C) |
Share electrons |
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B) |
Lose electrons |
D) |
Gain, lose, or share
electrons |
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Ans: D
Difficulty: Easy |
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4. |
_____ are negatively
charged ions that have _____ electrons than protons. |
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A) Anions,
more B) Cations, more C)
Anions, less D) Cations, less |
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Ans: A
Difficulty: Medium |
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5. |
Which statement concerning
the ion Li+ is correct? |
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A) |
Li+ has two total
electrons. |
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B) |
Li+ has an octet of
electrons in its valence shell. |
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C) |
Li+ is formed when a
lithium atom gains one electron. |
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D) |
Li+ is formed when a
lithium atom gains one proton. |
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Ans: A
Difficulty: Difficult |
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6. |
What is the electron
configuration of an F– ion? |
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A) 1s22s22p4 B)
1s22s22p5 C)
1s22s22p6 D)
1s22s22p63s1 |
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Ans: C
Difficulty: Difficult |
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7. |
What is the ion symbol for
an atom with twenty (20) protons and eighteen (18) electrons? |
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A) Ca
B) Ca2+ C) Ar D) Ar2+ E)
Ar2– |
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Ans: B
Difficulty: Medium |
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8. |
When forming ions, metals
typically do which of the following? |
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A) |
Lose electrons to form
negatively charged ions |
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B) |
Gain protons to form
cations |
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C) |
Gain electrons to form
anions |
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D) |
Lose electrons to form
positively charged ions |
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Ans: D
Difficulty: Easy |
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9. |
What is the ion symbol for
an atom with sixteen (16) protons and eighteen (18) electrons? |
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A) S2– B)
S C) Ar D) Ar2+ E)
Ar2– |
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Ans: A
Difficulty: Medium |
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10. |
How many protons and
electrons are present in Co2+? |
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A) |
27 protons, 27 electrons |
C) |
27 protons, 25 electrons |
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B) |
27 protons, 29 electrons |
D) |
29 protons, 27 electrons |
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Ans: C
Difficulty: Medium |
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11. |
What is the symbol for the
ion formed by magnesium? |
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A) Mg2– B)
Mg3+ C)
Mg2+ D)
Mg4– |
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Ans: C
Difficulty: Medium |
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12. |
What is the charge of the
ions formed by group 7A elements? |
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A)
+1 B) +7 C)
–1 D) –7 |
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Ans: C
Difficulty: Easy |
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13. |
What is the ion symbol of
the oxide ion? |
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A) O2– B)
O22– C) O2 D)
O2+ |
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Ans: A
Difficulty: Medium |
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14. |
Which element has a
variable charge? |
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A)
Na B) Fe C) Al
D) C |
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Ans: B
Difficulty: Medium |
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15. |
Which pair of elements will
form an ionic compound? |
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A) |
Sulfur and oxygen |
C) |
Iron and chlorine |
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B) |
Copper and iron |
D) |
Bromine and oxygen |
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Ans: C
Difficulty: Easy |
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16. |
What is the formula for the
ionic compound formed when potassium and bromine combine? |
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A)
PBr B) KBr C) KBr2 D)
K2Br |
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Ans: B
Difficulty: Easy |
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17. |
What is the formula for the
ionic compound lithium oxide? |
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A)
LiO B) LiO2 C) Li2O
D) Li2O2 |
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Ans: C
Difficulty: Medium |
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18. |
Which statement best
explains the basis for the octet rule? |
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A) |
Atoms are most stable when
they have eight bonds. |
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B) |
Atoms lose, gain, or share
electrons to become a stable, noble gas. |
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C) |
Atoms are most stable with
eight protons in their nucleus. |
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D) |
Atoms are most stable with
eight electrons in their valence shell and the electron configuration of a
noble gas. |
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Ans: D
Difficulty: Difficult |
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19. |
What is the formula for the
ionic compound formed when magnesium and oxygen combine? |
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A)
MgO B) MgO2 C) Mg2O
D) Mg2O2 |
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Ans: A
Difficulty: Medium |
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20. |
What is the formula for the
ionic compound formed when aluminum and sulfur combine? |
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A)
AlS B) Al2S3 C) AlS3 D)
Al2S |
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Ans: B
Difficulty: Difficult |
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21. |
What is the proper name for
CuCl? |
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A) |
Copper chloride |
C) |
Copper (II) chloride |
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B) |
Copper (I) chloride |
D) |
Copper monochloride |
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Ans: B
Difficulty: Difficult |
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22. |
What is the proper name for
MgF2? |
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A) |
Magnesium fluoride |
C) |
Magnesium (II) fluoride |
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B) |
Magnesium (I) fluoride |
D) |
Magnesium difluoride |
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Ans: A
Difficulty: Easy |
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23. |
What is the name of the SO42– ion? |
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A) Sulfide
ion B) Sulfate ion C) Sulfite
ion D) Bisulfate ion |
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Ans: B
Difficulty: Medium |
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24. |
What is the chemical
formula for the ionic compound calcium selenide? |
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A) Ca2Se2 B)
CaSe C) CaSe2 D) Ca2Se |
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Ans: B
Difficulty: Medium |
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25. |
What is the chemical
formula of tin (IV) cyanide? |
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A) Sn4CN
B) SnCN4 C) Sn(CN)4 D)
SnC4N4 |
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Ans: C
Difficulty: Difficult |
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26. |
The formula for zinc
acetate is _____. |
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A) ZnCH3CO2 B)
Zn(CH3CO2)2 C)
Zn(HCO3)2 D)
Zn(HCl)8 |
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Ans: B
Difficulty: Difficult |
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27. |
Which chemical formula
is not correct? |
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A) Na2HCO3 B)
NaNO3
C) Na2HPO4 D) Na2SO3 |
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Ans: A
Difficulty: Difficult |
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28. |
Which chemical formula is
correct? |
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A) Ag(CH3CO2)2 B)
K2CN
C) Mg(OH)2 D) MgHCO3 |
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Ans: C
Difficulty: Difficult |
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29. |
An atom has the
electron-dot symbol shown below. If this atom is a main group element,
what charge will it form in its ionic state? |
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A) –1 B)
+3 C) –5 D) –3 |
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Ans: B
Difficulty: Easy |
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30. |
Which atom fits the
electron-dot symbol shown below? |
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A) Li B)
B C) N D) Na |
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Ans: B
Difficulty: Medium |
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31. |
If atoms with the electron-dot
symbols shown below are combined, what is the formula of the ionic compound
that is formed? |
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A) XY B)
X2Y
C) XY2 D) X2Y2 E)
X3Y2 |
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Ans: B
Difficulty: Difficult |
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32. |
If atoms with the
electron-dot symbols shown below are combined, what is the formula of the
ionic compound that is formed? |
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A) XY B)
X2Y
C) XY2 D) X2Y2 E)
X3Y2 |
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Ans: A
Difficulty: Difficult |
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33. |
What period 4 element forms
an ion with a –1 charge? |
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A) Sulfur
B) Bromine C) Iodine D)
Rubidium |
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Ans: B
Difficulty: Medium |
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34. |
What is the name of the
compound (NH4)2SO4? |
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A) |
Ammonium sulfide |
C) |
Ammonia sulfoxide |
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B) |
Ammonia sulfate |
D) |
Ammonium sulfate |
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Ans: D
Difficulty: Difficult |
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35. |
Which compound has the
highest melting point? |
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A)
KCl B) CH4 C) C6H12O6 D)
H2O |
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Ans: A
Difficulty: Medium |
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36. |
What is the charge on the
chromium ion in the ionic compound CrCl3? |
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A)
+6 B) +3 C)
–3 D) –6 |
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Ans: B
Difficulty: Difficult |
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37. |
What is the formula for the
ionic compound formed from the lead (II) ion and the carbonate ion? |
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A) Pb(CO3)2 B)
PbCO3
C) Pb2CO3 D) PbCO4 |
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Ans: B
Difficulty: Difficult |
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38. |
The correct name for AuI3 is |
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A) Silver
iodide B) Gold iodide C) Gold
(III) iodide D) Gold iodide (III) |
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Ans: C
Difficulty: Medium |
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39. |
What is the formula for
chromous cyanide? |
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A)
CrCN B) Cr(CN)2 C) Cr(CN)3 D)
Cr2CN |
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Ans: B
Difficulty: Difficult |
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40. |
The diphosphate ion is a
biologically important polyatomic ion. If the ionic compound calcium
diphosphate has the formula Ca2P2O7, which correctly represents the ion symbol of the diphosphate
ion? |
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A) P2O72– B) PO4– C)
2 PO46– D)
P2O74– |
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Ans: D
Difficulty: Difficult |
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41. |
What is another name for an
unshared pair of electrons in a covalent compound? |
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A) |
Lone pair of electrons |
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B) |
Nonbonded electron pair |
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C) |
Bonding pair of electrons |
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D) |
Lone pair of electrons or
nonbonded electron pair |
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Ans: D
Difficulty: Easy |
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42. |
Which of the statements
concerning chemical bonds is false? |
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A) |
The sharing of electrons
between two nonmetal atoms results in a covalent bond. |
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B) |
The attraction between
oppositely charged ions results in an ionic bond. |
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C) |
The term nonpolar is used
to describe a covalent bond in which electrons are not shared equally. |
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D) |
A bond dipole is the separation
of charge that results when atoms sharing electrons have different
electronegativities. |
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Ans: C
Difficulty: Medium |
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43. |
How many covalent bonds are
generally formed by atoms with five valence electrons? |
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A)
1 B) 2 C) 3
D) 4 E) 5 |
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Ans: C
Difficulty: Medium |
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44. |
How many lone pairs of
electrons are present in the Lewis structure of ammonia, NH3? |
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A)
0 B) 1 C) 2
D) 3 E) 4 |
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Ans: B
Difficulty: Easy |
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45. |
How many nonbonded electron
pairs are in the Lewis structure below? |
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A) 2 B)
4 C) 6 D) 8
E) 16 |
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Ans: B
Difficulty: Easy |
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46. |
What is the Lewis structure
for chloroethylene (C2H3Cl)? |
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A) |
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B) |
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C) |
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D) |
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Ans: C
Difficulty: Difficult |
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47. |
How many valence electrons
are in a molecule of formaldehyde (CH2O)? |
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A)
16 B) 12 C)
10 D) 8 |
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Ans: B
Difficulty: Medium |
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48. |
Predict the bond angles
around the carbon atom in the structure of carbonic acid shown below. Don’t
forget to draw in lone pairs where needed to give octets. |
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A) 180°
B) 120° C) 109.5° D)
90° |
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Ans: B
Difficulty: Medium |
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49. |
What is the molecular shape
around the phosphorus atom in PH3? |
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A) Linear B) Bent C) Trigonal planar D) Tetrahedral E) Trigonal pyramidal |
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Ans: E
Difficulty: Difficult |
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50. |
What are the bond angles in
a tetrahedral geometry? |
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A)
180° B) 120° C)
109.5° D) 90° |
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Ans: C
Difficulty: Easy |
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51. |
Aspartic acid is an amino
acid used to synthesize proteins. How many lone pairs of electrons need
to be added to complete the aspartic acid structure shown below? |
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A) 4 B)
6 C) 8 D) 9 |
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Ans: D
Difficulty: Medium |
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52. |
Which of the following
molecule(s) is(are) polar? |
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A) CO2 B)
CH4 C)
CBr4
D) CHBr3 |
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Ans: D
Difficulty: Difficult |
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53. |
Rank the atoms Br, Cl, and
K in order of increasing electronegativity. |
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A) K < Br <
Cl B) Cl < Br < K C) Br
< Cl < K D) K < Cl < Br |
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Ans: A
Difficulty: Difficult |
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54. |
Rank the atoms Br, Cl, and
F in order of increasing electronegativity. |
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A) F < Br <
Cl B) Cl < Br < F C) Br
< Cl < F D) F < Cl < Br |
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Ans: C
Difficulty: Medium |
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55. |
Which atom has the lowest
electronegativity? |
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A)
Al B) S C)
Se D) Rb |
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Ans: D
Difficulty: Medium |
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56. |
Which bond is the most polar? |
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A)
C–N B) C–O C)
C–C D) C–Cl E) C–F |
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Ans: E
Difficulty: Difficult |
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57. |
Which bond is the least polar? |
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A)
C–N B) C–O C)
C–C D) C–Cl E) C–F |
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Ans: C
Difficulty: Easy |
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58. |
Aspartic acid is an amino
acid used to synthesize proteins. How many polar bonds are in the
aspartic acid structure shown below? |
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A) 4 B)
6 C) 9 D) 12 |
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Ans: C
Difficulty: Difficult |
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59. |
What is the correct
chemical formula of selenium dioxide? |
|
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A) SO2 B)
SeO2
C) Se2O D) OS2 |
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Ans: B
Difficulty: Easy |
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60. |
Which bond has the polarity
incorrectly labeled? |
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A) d+ H–Cl d–
B) d+ O–C d– C) d+ Cl–F d–
D) d– Cl–Br d+ |
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Ans: B
Difficulty: Medium |
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61. |
Which is the correct Lewis
structure for OBr–? |
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A) |
D) |
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B) |
E) |
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C) |
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Ans: B
Difficulty: Difficult |
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62. |
Estimate the bond angles
around the sulfur atom in the structure shown below. |
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A) 90° B)
109.5° C) 120° D) 180° |
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Ans: B
Difficulty: Medium |
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63. |
What is the molecular shape
around the nitrogen atom in the structure shown below? |
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A) Linear B) Bent C) Trigonal planar D) Tetrahedral E) Trigonal pyramidal |
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Ans: B
Difficulty: Difficult |
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64. |
What is the molecular shape
around the oxygen atom in the structure shown below? |
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A) Linear B) Bent C) Trigonal planar D) Tetrahedral E) Trigonal pyramidal |
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Ans: B
Difficulty: Difficult |
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65. |
Which element may have more
than eight valence electrons around it when present in a covalent compound? |
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A)
C B) B C) N
D) P E) O |
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Ans: D
Difficulty: Medium |
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66. |
Which molecule or ion
has only two
resonance structures to describe its bonding? |
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A) CO32– B) NO3– C) HCO31– D) SO3 |
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Ans: C
Difficulty: Difficult |
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67. |
Which of the following is
classified as a group in the valence shell electron pair repulsion (VSEPR)
theory? |
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A) |
An atom |
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B) |
A lone pair of electrons |
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C) |
A valence electron |
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D) |
Either an atom or a valence
electron |
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E) |
Either an atom or a lone
pair of electrons |
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Ans: E
Difficulty: Medium |
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68. |
Which molecule’s Lewis
structure contains an atom that violates the octet rule? |
|
|
A) H2O
B) BeH2 C) PCl3 D)
H2Se |
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Ans: B
Difficulty: Difficult |
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69. |
Which compound has the
greatest number of valence electrons? |
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A) |
H2S |
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B) |
CH4 |
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C) |
NH3 |
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D) |
H2O |
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E) |
All of the molecules above
have the same number of valence electrons. |
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Ans: E
Difficulty: Medium |
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70. |
Which atom(s) in the
structure below has(have) a partial negative charge (d–)? |
|
|
A) Carbon B) Fluorine C) Hydrogen D) Nitrogen E) Nitrogen and fluorine |
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Ans: E
Difficulty: Medium |
|
71. |
How many lone pairs of
electrons need to be added to the Lewis structure of carbonic acid shown
below? |
|
|
A) 0 B)
3 C) 4 D) 6 |
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Ans: D
Difficulty: Medium |
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72. |
What is the total number of
bonding electrons in the structure below? |
|
|
A) 5 B)
10 C) 20 D) 30 |
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Ans: C
Difficulty: Medium |
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73. |
Which Lewis structure is
incorrect? |
|
|
|
A) |
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|
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B) |
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|
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C) |
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|
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D) |
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Ans: B
Difficulty: Difficult |
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74. |
The Lewis structure shown
below is not a valid Lewis structure. What statement best describes the
error in the structure? |
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|
|
A) |
The nitrogen atoms violate the octet
rule. |
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B) |
The chlorine atoms violate the octet
rule. |
|
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C) |
The structure contains an incorrect
number of valence electrons. |
|
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D) |
Chlorine atoms and nitrogen atoms do
not typically form bonds with each other. |
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|
Ans: C
Difficulty: Difficult |
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75. |
Which of the statements
concerning compounds is incorrect? |
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|
|
A) |
Compounds are formed when
atoms of two or more different elements are chemically bonded. |
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B) |
Ionic compounds are
composed of cations and anions. |
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C) |
Covalent compounds are
composed of metals and nonmetals. |
|
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D) |
Covalent compounds are
composed of individual molecules. |
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|
Ans: C
Difficulty: Easy |
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76. |
Which statement concerning
chemical bonds is false? |
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|
|
A) |
A covalent bond involves
the sharing of electrons between two nonmetal atoms. |
|
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B) |
An ionic bond is the
attraction between oppositely charged ions. |
|
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C) |
A nonpolar bond is a
covalent bond in which electrons are not shared equally between the atoms. |
|
|
D) |
Electronegativity is a
measure of the attraction an atom has for the electrons it shares in a bond. |
|
|
Ans: C
Difficulty: Easy |
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|
77. |
Considering the
electronegativity values indicated for each element, which covalent bond has
the least degree of polarity?
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A) C–N B)
N–O C) F–F D) H–Cl |
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Ans: C
Difficulty: Medium |
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78. |
The covalent bond between
chlorine and iodine is a polar one. Which of the following properly
represents the direction of polarity in this bond? |
|
|
A) d+ Cl–I d–
B) d– Cl–I d+ C) + Cl–I –
D) – Cl–I + |
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|
Ans: B
Difficulty: Medium |
|
79. |
The Lewis structure of
formaldehyde is shown below. Which statement concerning this structure
is incorrect? |
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|
|
A) |
Two electrons are being shared between
the carbon atom and the oxygen atom. |
|
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B) |
The oxygen atom has four valence
electrons that are not being shared with another atom. |
|
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C) |
The oxygen and carbon atoms each have
an octet of electrons in their valence shells. |
|
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D) |
The hydrogen atoms have filled valence
shells. |
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Ans: A
Difficulty: Medium |
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80. |
Anions are formed when a
neutral atom gains one or more electrons. |
|
|
A)
True B) False |
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Ans: A
Difficulty: Easy |
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81. |
The (II) in the name of the
ionic compound lead (II) acetate specifically indicates that there are two
lead ions present in the compound. |
|
|
A)
True B) False |
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Ans: B
Difficulty: Medium |
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82. |
Neutral atoms always
contain an equal number of protons, neutrons, and electrons. |
|
|
A)
True B) False |
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Ans: B
Difficulty: Medium |
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83. |
Ionic compounds are
composed of individual molecules, discrete groups of atoms that share
electrons. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Easy |
|
84. |
Ionic compounds are
composed of positively and negatively charged ions held together by strong electrostatic
forces. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Easy |
|
85. |
Bonding is the joining of
two atoms in a stable arrangement. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Easy |
|
86. |
Ionic bonds result from the
sharing of electrons between two atoms. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
87. |
A cation is positively
charged, and has more electrons than the neutral atom. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
88. |
The ionic formula for zinc
oxide is ZnO2. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
89. |
Ionic compounds have very
high melting points compared to covalent compounds. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Easy |
|
90. |
All ionic compounds are
soluble in water. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Easy |
|
91. |
An ionic compound is a pure
substance formed by chemically combining two or more nonmetal atoms together. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
92. |
A polyatomic ion is an ion
that forms more than one charge. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Easy |
|
93. |
The name of an anion
usually ends in the -ide if
it is derived from a single atom or -ate (or -ite) if it is
polyatomic. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Medium |
|
94. |
The correct name for CaHPO4 is calcium phosphate. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
95. |
The symbol for the nitrite
ion is NO2–. |
|
|
A) True
B) False |
|
|
Ans: A
Difficulty: Medium |
|
96. |
The noble gas that has the
same electronic configuration as the iodide ion is krypton. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
97. |
Elements in group 2A form
ions with a +2 charge. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Easy |
|
98. |
Ionic compounds are usually
solids at room temperature. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Easy |
|
99. |
The formula for copper (II)
hydroxide is Cu(OH)2. |
|
|
A) True
B) False |
|
|
Ans: A
Difficulty: Medium |
|
100. |
Sodium nitrate and sodium
nitrite are two acceptable names for the same compound. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
101. |
Sodium bicarbonate and
sodium hydrogen carbonate are two acceptable names for the same compound. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Medium |
|
102. |
The sulfite ion contains
more oxygen atoms than the sulfate ion. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
103. |
The carbonate ion contains
the same number of oxygen atoms as the sulfate ion. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
104. |
The electron configuration
for the sulfide ion is 1s22s22p63s23p64s2. |
|
|
A) True
B) False |
|
|
Ans: B
Difficulty: Difficult |
|
105. |
If the main group element
has an electron-dot symbol of , the charge of the resulting ion will be +2. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Medium |
|
106. |
If the main group element
has an electron-dot symbol of , the charge of the resulting ion will be –2. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Medium |
|
107. |
All polyatomic ions are
anions. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Easy |
|
108. |
All isotopes of an element
form the same type of ion. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Medium |
|
109. |
All p block elements
form ions. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Difficult |
|
110. |
The ion symbol for the
ferric ion is Fe2+. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
111. |
An iron (III) ion has 29
protons and 26 electrons. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
112. |
An iodide ion has 53
protons and 54 electrons. |
|
|
A) True
B) False |
|
|
Ans: A
Difficulty: Medium |
|
113. |
Strontium and barium form
ions with the same charge. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Easy |
|
114. |
Potassium sulfide has the
chemical formula K2S. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Medium |
|
115. |
In crystal of an ionic
compound, the cations are surrounded by anions so that the charges of the
ions are balanced. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Easy |
|
116. |
The formula for stannic
fluoride is SnF4. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Medium |
|
117. |
The chemical formulas of
ionic compounds are written with the cation first, and then the anion, with
subscripts to show how many of each are needed to have zero net charge. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Easy |
|
118. |
A main group element is
especially stable when it possesses eight total electrons. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
119. |
When magnesium forms an ion
it gains two electrons. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
120. |
When forming an ion, an
atom with the electron-dot symbol of forms an anion with a –3 charge by
the loss of three electrons. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
121. |
A molecule is a discrete
group of atoms held together by covalent bonds. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Easy |
|
122. |
A Lewis structure shows the
connectivity between atoms in a molecule, as well as where all the bonding
and nonbonding valence electrons reside. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Medium |
|
123. |
Bonding is the joining of
two atoms in a stable arrangement. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Easy |
|
124. |
Atoms with three valence
electrons generally form five bonds. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
125. |
Atoms with seven valence
electrons typically form one covalent bond. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Medium |
|
126. |
Every atom must have an
octet of electrons in order for a Lewis structure to be considered valid. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
127. |
Phosphorus usually forms
two covalent bonds in a molecule. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
128. |
A double bond consists of
four electrons shared between two atoms. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Easy |
|
129. |
The Lewis structure for BH3 contains an atom that
does not follow the octet rule. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Medium |
|
130. |
The Lewis structure for PH3 contains an atom that
does not follow the octet rule. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
131. |
Resonance structures for a
substance differ only in the location of multiple bonds and the position of
lone electron pairs. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Medium |
|
132. |
There can be no more than
two resonance structures for a molecule. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Medium |
|
133. |
The correct name for SF6 is sulfur
heptafluoride. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Easy |
|
134. |
The formula for dinitrogen
pentoxide is N5O2. |
|
|
A)
True B) False |
|
|
Ans: B
Difficulty: Easy |
|
135. |
A bond formed between the
elements hydrogen and bromine would be considered an ionic bond. |
|
|
A) True
B) False |
|
|
Ans: B
Difficulty: Easy |
|
136. |
Unequal sharing of
electrons in a covalent bond results in a polar bond. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Easy |
|
137. |
Nonpolar molecules may
contain polar bonds. |
|
|
A) True
B) False |
|
|
Ans: A
Difficulty: Medium |
|
138. |
Some covalent compounds are
solids, some are liquids, and some are gases at room temperature. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Easy |
|
139. |
C–H bonds are considered to
be nonpolar, because the electronegativity difference between carbon and
hydrogen is small. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Medium |
|
140. |
The symbol d– is given to the more
electronegative atom in a polar bond. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Medium |
|
141. |
The structures shown below
are resonance structures of sulfur dioxide. and |
|
|
A) True
B) False |
|
|
Ans: A
Difficulty: Medium |
|
142. |
The structures shown below
are resonance structures of sulfur dioxide. and |
|
|
A) True
B) False |
|
|
Ans: B
Difficulty: Medium |
|
143. |
In the valence shell
electron pair repulsion (VSEPR) theory, a group is defined as an atom or a
lone pair of electrons. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Medium |
|
144. |
A molecule that contains
only one polar bond is a polar molecule. |
|
|
A)
True B) False |
|
|
Ans: A
Difficulty: Easy |
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