CHEM 2100 Practice for Exam 2 Spring 2014
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Name_________________Class number______
Circle the best answer on this sheet and on your scantron.
1. An ion with an atomic number of 20 and 18 electrons has a ________ charge.
A) –2
B) +38
C) –38
D) +2
E) none of these
2. Which of the following is the carbonate ion?
A) CO3-2
B) SO4-2
C) PO4-3
D) S-2
E) none of these
Which of the following is one of the main cations in the body that regulates fluids outside cells?
A) Fe+2
B) Ba+2 C) Na+
D) NH4+
E) none of these
3. In order to form an octet, an atom of phosphorous will
A) lose 5 electrons B) gain 3 electrons C) lose 2 electrons
D) gain 2 electrons
4. Which of the following ions is isoelectronic with the noble gas neon?
A) OB) ClC) +
D) S-2 E) none of these or more than one of these
5. Which of the following is the symbol for the phosphite ion?
E) P-3 E) none of these
A) PO3-3
B) PO4-3
C) PO-3
D) PO2-3
6. Which of the following anions has the same charge as the sulfate ion?
A) NO3B) NH4+
C) CO3-2
D) PO4-3 E) none of these
7. Which of the following formulas in incorrect for a cobalt (II) compound?
A) CoCl3
B) CoCO3
C) CoO
D) Co3(PO4)2 E) none of these
8. Which compound contains both covalent and ionic bonds?
A) NH4OH
B) CaCl2
C) HC2H3O2
D) NaCl E) none of these
9. What is the name and symbol of an ion that has 26 protons and 23 electrons?
A) Fe+3
B) Fe+2
C) Mn+2
D) Mn+3 E) none of these
10. Iron pyrite (fool's gold) is iron (II) sulfide. What is its formula?
A) FeS
B) FeSO3
C) FeSO4
D) Fe2S3 E) none of these
11. The correct name for Cr2O3 is:
A) chromium oxide B) chromium (II) oxide
C) chromium (III) oxide D) dichromium trioxide
12. What is the correct name for a molecule of SO3?
A) Sulfur trioxide
B) Sulfur oxide
C) Sulfite
D) Sulfate E) none of these
13. The approximate bond angles between the atoms in a molecule with a trigonal planar electron
pair geometry are:
A) 90°
B) 120°
C) 180°
D) 109.5° E) none of these
14. What is the molecular geometry of a NH3 molecule?
A) Tetrahedral B) Trigonal planar C) Bent D) Trigonal pyramidal E) none of these
CHEM 2100 Practice for Exam 2 Spring 2014
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Use the following structures to answer the next five questions.
A
B
C
D
15. What is the molar mass of structure A?
A) 114 g/mole B) 72 g/mole C) 86 g/mole D) 112 g/mole E) none of these
16. Structures A, B and C are:
A) isotopes B) structural isomers C) different molecules D) conformational isomers E) None of these
17. Structures A and D are
A) different molecules B) structural isomers C) isotopes D) conformational isomers E) None of these
18. Which of the following statements is/are correct?
I.
Structures A, B, C and D are all alkenes
II.
Structures A, B, C and D are all alkanes
III.
Structures A, B, C and D are all polar
IV.
Structures A, B, C and D are all nonpolar
A) I and III B) II and IV C) I, II and III D) IV only E) none of these or more than one of these
19. A bond where the electrons are shared equally is called a(n):
A) polar covalent B) coordinate covalent C) nonpolar covalent D) ionic
20. Which of the following molecules is polar?
A) CH4 B) CO2 C) SO2 D) SO3 E) none of these, or more than one of these
21. Which of the following molecules is nonpolar?
A) NH3 B) CH3F
C) CCl4
D) H2O E) none of these, or more than one of these
22. Which of the following molecules are polar?
I.
Methane gas
II.
Hydrogen gas
III.
Hydrogen sulfide
IV.
CH3CH2OH
A) I and III B) II and IV C) I, II and III D) IV only E) none of these or more than one of these
Use the following structures to answer the next set of questions:
CHEM 2100 Practice for Exam 2 Spring 2014
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histrionicotoxin
H
N
amphetamine
NH2
HO
O
HO
Palmitoleic acid
phenanthrene
23. Which of these molecules is found in secretions from a frog?
A) amphetamine B) histrionicotoxin C) palmitoleic acid D) phenanthrene
E) none of these or more than one of these
24. Which of these molecules are totally non-polar?
A) amphetamine B) histrionicotoxin C) palmitoleic acid D) phenanthrene
E) none of these or more than one of these
25. Which of these molecules is an ω-7 mono unsaturated fatty acid?
A) amphetamine B) histrionicotoxin C) palmitoleic acid D) phenanthrene
E) none of these or more than one of these
26. Which of these molecules has an amine and an alkene group?
A) amphetamine B) histrionicotoxin C) palmitoleic acid D) phenanthrene
E) none of these or more than one of these
27. Which of these molecules has an aromatic ring and an amine?
A) amphetamine B) histrionicotoxin C) palmitoleic acid D) phenanthrene
E) none of these or more than one of these
28. Which of these molecules has an alkyne?
A) amphetamine B) histrionicotoxin C) palmitoleic acid D) phenanthrene
E) none of these or more than one of these
29. Which of these molecules has a phenol group?
A) amphetamine B) histrionicotoxin C) palmitoleic acid D) phenanthrene
E) none of these or more than one of these
30. Which of these molecules is found in butter?
A) amphetamine B) histrionicotoxin C) palmitoleic acid D) phenanthrene
E) none of these or more than one of these
31. Which of these molecules is a toxin found in cigarette smoke?
A) amphetamine B) histrionicotoxin C) palmitoleic acid D) phenanthrene
E) none of these or more than one of these
32. What is the molar mass of manganese(II) bromide?
CHEM 2100 Practice for Exam 2 Spring 2014
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A) 349.5 g/mole B) 134.8 g/mole C) 189.7 g/mole D) 214.7 g/mole
33. What is the molecular geometry of CH2O?
A) Trigonal pyramidal B) Linear C) Tetrahedral
D) Trigonal planar
34. A bond where the electrons are shared unequally is called a(n):
A) polar covalent B) coordinate covalent C) purely (nonpolar) covalent
35. Which of the following molecules is an ω-3 fatty acid?
A) arachidonic acid B) α-linolenic acid C) oleic acid
D) ionic
D) palmitoleic acid
E) none of these
36. Which of the following molecules is polar?
A) ethane B) ethene C) ethanol D) ethyne E) none of these or more than one of these
37. Which of the following is the condensed structure of oleic acid?
A) CH3(CH2)12COOH
B) CH3(CH2)7CH=CH(CH2)7COOH
C) CH3(CH2)4CH=CHCH2CH=CH(CH2)7COOH
D) CH3(CH2)14COOH
E) none of these
38. Which of the following structures is cyclobutane?
A)
B)
C)
D)
39. Which of the following is the structure for stearic acid?
A) CH3(CH2)14COOH B) CH3(CH2)16COOH C) CH3(CH2)18COOH
D) CH3(CH2)10COOH
40. The fatty acid that contains 2 double bonds is:
A) oleic acid
B) palmitic acid
C) linoleic acid
D) stearic acid E) none of these
41. Which of the following molecules contains a chiral carbon?
A)
B)
C)
D)
E) none of these, or more than one of these
42. Which of the following fatty acids is an essential fatty acid?
A) Oleic acid B) Arachidonic acid C) Linoleic acid D) Stearic acid
43. A molecule that has both polar and nonpolar parts is said to be:
A) an isomer B) amphipathic C) an enantiomer D) hydrophobic
E) none of these
CHEM 2100 Practice for Exam 2 Spring 2014
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44. Which of the atoms in histrionicotoxin are chiral? Each atom (except hydrogen) has a number,
select the answer that has all of the numbers for all of the chiral atoms.
6
histrionicotoxin
1
5
11
H
N
4
2
16
12
17
10
18
3
HO
7
9
13
15
20
19
8
21
14
A) 2, 11 B) 15, 16, 20, 21
C) 2, 3, 4, 10 D) 1,6,5,8, 9, 17
E) none of these or more than one of these
45. The name of the following alkyl group is:
CH3CH2A) Methyl B) Isopropyl C) Propyl D) Ethyl E) none of these or more than one of these
46. Among the following compounds which are isomers?
A) I and II
B) I and III
C) I and IV
D) II and III