CHEM 1406 Practice Exam 4:

Organic Functional Groups, Carbohydrates, and Nuclear Chemistry Many of the following questions have been taken from the web resources made available by San Diego Miramar College, a member of

the San Diego Community College District (SDCCD). Modifications have been made for clarity, to correct typos, and better align

questions to TCC curriculum. We thank the faculty of San Diego Miramar College for making this resource available to us. Other

sources include the test bank associated with the Timberlake chemistry textbook.

I. Organic Functional Groups

Select the best answer to each of the following questions:

1. Oxybenzone, a compound that acts as a UV-absorber in sunscreen, is shown below. What functional

groups are present in the molecule?

A) Aldehyde, alcohol, aromatic, and ether

B) Aromatic, carboxylic acid, and ether

C) Alcohol, aromatic, ester, and ether

D) Alcohol, aromatic, ether, and ketone

E) Alcohol, aromatic, ester, and ketone

2. Which of the following is not characteristic of organic compounds?

A) They are insoluble in water.

B) They have high melting points.

C) They burn vigorously in air.

D) They contain only covalent bonds.

E) All of the above are characteristic of organic compounds.

3. A molecule with a carbon that is both double bonded to an oxygen AND single bonded to an OH group is

called a(n) __________.

A) carboxylic acid

B) ether

C) ester

D) alcohol

E) aldehyde

4. Select the correct IUPAC name for the following substituted alkane.

A) 2-chloro-5-ethylhexane

B) 3-methyl-6-chloroheptane

C) 2-ethyl-5-chlorohexane

D) 2-chloro-5-methylheptane

E) 1-chloro-1-methyl-4-ethylpentane

5. Select the correct IUPAC name for the following substituted alkane.

A) 2-chloro-4-isopropylpentane

B) 5-chloro-2,3-dimethylhexane

C) 4-chloro-2-isopropylpentane

D) 2-chloro-4,5-dimethylhexane

E) None of the above are correct names for this compound.

6. Write the complete balanced equation for the combustion of ethane (C2H6)

𝟐𝑪𝟐𝑯𝟔 + 𝟕𝑶𝟐 → 𝟒𝑪𝑶𝟐 + 𝟔𝑯𝟐𝑶

For questions 7 and 8, write the correct IUPAC name for the indicated alkane or cycloalkane:

7. __ethylcyclohexane____________________

8. ___5-butyl-2,2-dimethylnonane___________

For questions 9 and 10, draw the structure of the compounds with the following names:

9. 2,4-dichloro-3-ethylpentane 10. 1,1-dimethylcyclopropane

For questions 11-16, write the correct IUPAC names of the following compounds. (Hint: If it is an alkene,

be sure to check if it might be cis or trans.)

11. _3-methylcyclohexene___________ 12. ____5-chloro-2-pentyne________________

13. ___trans-2-methyl-3-hexene______ 14. ______2-methyl-2-butene_______________

15. ___propyne___________________ 16. ____3-chlorotoluene___________________

For questions 17-22, draw the correct structure for the compounds with the given name:

17. trans-2-butene 18. 4-chlorocyclopentene

19. 3,4-diethyl-1-hexyne 20. 1,4-dibromocyclohexene

21. cis-6-fluoro-4,5-dimethyl-2-octene 22. p-dibromobenzene

For questions 23-24, please indicate the product of the following addition reactions:

23. + 𝑯𝟐𝑶 𝑯+ →

_________________________________________________________________________________________

24. + 𝑯−𝑯 𝑷𝒕 →

____________________________________________________________________________

For questions 25-30, please write the correct IUPAC OR common name for the following compounds:

25. ___ethyldiisopropylamine_________ 26. ____methyl pentanoate_______

27. _3-ethyl-2-methyl-3-hexanol______ 28. __ethyl methyl ether__or___methoxyethane_

29. ___2,3-dichloropropanoic acid_____ 30. __N-ethylbutanamide__________________

For questions 31-36, please draw the structure for the following compounds.

31. 2-ethoxypropane 32. 2,3-dimethylcyclopentanol

33. N-methylpropanamide 34. Ethyl propanoate

35. trimethylamine 36. 2,2-difluorobutanoic acid

37. Which of the following alcohols would be considered primary?

i. ii. iii. iv. v.

A) iv only

B) i, ii, iv, and v

C) i and iv

D) i, iii, and iv

E) i, ii, and iv

F) All of the alcohols shown above are primary.

For questions 38-40, please indicate the product(s) of the following reactions:

38) [𝑶] →

[𝑶] →

(oxidation) (oxidation)

39) + 𝑯+, 𝒉𝒆𝒂𝒕 → + H2O

(esterification)

40) + 𝑵𝒂𝑶𝑯 → + 𝑯𝟐𝑶

(neutralization)

II. Carbohydrates

Select the best answer to each of the following questions.

41. What is the correct classification for the following sugar molecule?

A) Aldohexose

B) Aldopentose

C) Ketohexose

D) Ketopentose

E) None of the above.

42. What is the correct classification for the following sugar molecule?

A) Aldohexose

B) Aldopentose

C) Ketohexose

D) Ketopentose

E) None of the above.

For questions 43-46, answer the questions relating to the given carbohydrates:

Sucrose Cellulose

i. ii. iii. iv. v.

43. Which of the given carbohydrates would be classified as a monosaccharide?

A) iv only

B) i, ii, and iii

C) i and iii

D) i, ii, iii, and iv

E) None of the above choices are correct.

44. Which of the given carbohydrates would be classified as a disaccharide?

A) iv only

B) i, ii, and iii

C) i and iii

D) i, ii, iii, and iv

E) None of the above choices are correct.

45. Which of the given carbohydrates would be classified as a polysaccharide?

A) iv only

B) i, ii, and iii

C) i and iii

D) i, ii, iii, and iv

E) None of the above choices are correct.

46. Which of the sugars above is (are) reducing sugars? (Hint: Polysaccharides are NOT considered sugars

and can therefore be excluded.)

A) i, ii, and iii

B) i and iii

C) i, iii, and v

D) i, ii, iii, and v

E) None of the above choices are correct.

47. Select the terms that correctly complete the following statement:

_______________ are carbohydrates composed of two _________________ units that are joined by a

_______________ bond.

A) Monosaccharides, monomer, glycosidic

B) Disaccharides, monosaccharide, covalent

C) Polysaccharides, monosaccharide, glycosidic

D) Hayworth projections, monosaccharide, acetal

E) Disaccharides, monosaccharide, glycosidic

48. The Fischer projection and Hayworth projection below are of the same molecule, fructose. Classify the

fructose molecule as either the D or L isomer and indicate whether its ring form is α or β.

A) D, β B) L, β C) D, α D) L, α

49. Draw the α and β Hayworth projections for the following molecule of D-glucose.

α-D-glucose Hayworth Projection β-D-glucose Hayworth Projection

50. Identify the following molecule as chiral or achiral. If chiral, indicate the number of the carbon that is

the chiral carbon.

A) The compound is achiral.

B) The compound is chiral. Carbon #2 is the chiral carbon.

C) The compound is chiral. Carbon #3 is the chiral carbon.

D) The compound is chiral. Carbon #4 is the chiral carbon.

E) The compound is chiral. Carbons #2 and #4 are both chiral carbons.

III. Nuclear Chemistry

51. The product from the alpha decay of 𝑼𝟗𝟐𝟐𝟑𝟓 .

a) Np93235 b) Pu94

239 c) Ra80233 d) Th90

231 e) U92236

52. The nuclear symbol of helium, 𝑯𝒆𝟐𝟒 , is also the symbol for designating a(n)

a) Proton

b) neutron

c) gamma ray

d) beta particle

e) alpha particle

53. The symbol 𝒆−𝟏𝟎 is a symbol that represents a(n)

a) Proton

b) beta particle

c) gamma ray

d) alpha particle

e) neutron

54. Which of the following types of radiation has the highest energy?

a) α - particle

b) γ - particle

c) β - particle

d) visible light

e) all of these have the same energy

55. For an atom of the isotope 𝑺𝒓𝟑𝟖𝟖𝟓 , there are

a) 85 protons and 38 neutrons

b) 47 protons and 38 neutrons

c) 38 protons and 85 neutrons

d) 38 protons and 47 neutrons

e) 85 protons and 47 neutrons

56. Which is NOT a way to minimize your exposure to radiation?

a) staying a longer time

b) wearing lead-lined gloves

c) wearing a lead apron

d) keeping a good distance

e) standing behind a thick concrete wall

57. The nuclear reaction shown below is an example of what type of process?

𝑻𝒉𝟗𝟎𝟐𝟐𝟒 → 𝑹𝒏𝟖𝟖

𝟐𝟐𝟎 + 𝑯𝒆𝟐𝟒

a) translation

b) fission

c) fusion

d) beta emission

e) alpha emission

58. Nitrogen-17 is a beta emitter. What is the isotope produced in the radioactive decay?

a) C618 b) B5

13 c) N718 d) O8

17 e) F913

59. What is missing in the nuclear reaction shown below?

𝑩𝟓𝟏𝟎 + 𝑯𝒆𝟐

𝟒 → 𝒏𝟎𝟏 + _____

a) a neutron b) 𝐵713 c) 𝑁7

14 d) 𝑁513 e) 𝑁7

13

60. When aluminum-27 is bombarded with a neutron, a gamma ray is emitted. What radioactive isotope is

produced?

a) silicon-27

b) aluminum-28

c) silicon-28

d) magnesium-27

e) magnesium-28

61. Iodine-123, which is used for diagnostic imaging in the thyroid, has a half-life of 13 hours. If 50.0 mg of

I-123 were prepared at 8:00 A.M. on Monday, how many mg remain at 10:00 A.M. on the following day?

a) 12.5 mg

b) 6.25 mg

c) 3.13 mg

d) 25.0 mg

e) 50.0 mg

62. A sample of cerium-141 for a diagnostic test was dissolved in saline solution to an activity of 4.5

millicuries/mL. If the patient undergoing the test needs a dose of 10 millicuries, how much of the solution

should be injected into the patient?

a) 4.5 mL

b) 22 mL

c) 0.45 mL

d) 45 mL

e) 2.2 mL

63. The recommended dosage of I-131 for a test is 4.2 microcuries per kg of body weight. How many

millicuries should be given to a 55 kg patient? (1 mCi = 1000 μCi)

a) 230 millicuries

b) 760 millicuries

c) 0.076 millicuries

d) 0.23 millicuries

e) 13.8 millicuries

64. The nuclear energy commonly produced in this country comes from _______________.

a) Potential Energy

b) Activiation Energy

c) Nuclear Fission

d) Nuclear Fusion

e) none of the above

65. The following are produced by radioactive processes. Which one has no mass and no charge?

a) alpha particle

b) beta particle

c) gamma radiation

d) neutron

e) positron

66. The number of half-lives needed for a radioactive element to decay to one-eight of its original activity is

(choose the nearest number):

a) 2

b) 3

c) 5

d) 10

e) none of the above

67. Alpha radiation is actually a cation of

a) carbon

b) calcium

c) helium

d) hydrogen

e) none of the above

68. Which type of radiation will completely go through your body and requires lead or concrete walls to stop

its progress.

a) alpha

b) beta

c) gamma

d) radiowave

e) none of the above

69. Electron capture transforms 7Be into what nuclide?

a) 6Li b) 8B c) 7Li d) 6Be e) 12C

70. Identify the missing particle in the following equation: 238U → 4He + _____

a) 242Pu b) 234Th c) 242Th d) 234U e) none of the above

71. What nuclide product is necessary to balance the following fission reaction:

238U + 1n → 3 1n + 139Ba + ______

a) 96Br b) 96Kr c) 94Rb d) 97Kr e) 90Sr

72. When 28Al emits a ß- particle it becomes:

a) 28Mg b) 28Si c) 29Si d) 27Al e) none of the above

73. A radioactive element has a half-life of 2.0 hr. How many hours will it take for the number of atoms

present to decay to 1/16th of the initial value?

a) 16

b) 8

c) 4

d) 2

e) 32

74. The smallest amount of radioactive material that will support a self-sustained nuclear reaction is called

the:

a) molar mass

b) moderator

c) supercritical mass

d) sub critical mass

e) critical mass

75. Which of the following is NOT TRUE of nuclear fission?

a) High temperatures are required for the process to occur.

b) The energy released is very large.

c) The starting materials are heavy elements like U or Pu.

d) It happens in the hydrogen bomb.

e) Long-lived radioactive isotopes are formed as a result of this process.