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Practice Exam 3 | Introductory Chemistry I | CHEM 1405, Exams of Chemistry

Material Type: Exam; Professor: Newton; Class: Introductory Chemistry I; Subject: Chemistry; University: Laredo Community College; Term: Fall 2006;

Typology: Exams

Pre 2010

Uploaded on 08/18/2009

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LAREDO COMMUNITY COLLEGE
Science Department
CHEM 1405 Practice Exam # 3 ch. 3 Fall, 2008 Newton
Name: ID #
(last 4 digits)
INSTRUCTIONS:
Write your name on both portions of the exam and on the Scantron Answer Sheet.
Fill in the following information on the Scantron Answer Sheet.
Name
Subject: CHEM 1405 Test No.
Date: 11/07/06 Period: Section (M01)
Circle the letter of the BEST answer(s) on the test here. When you have finished, use a #2 pencil and
completely darken the letter(s) on the Scantron form which corresponds to your choice. If you make a
mistake, erase the wrong answer completely. Each question is worth three (3) points.
Some questions may have more than one correct answer. In order to receive credit for the question,
ALL CORRECT ANSWERS MUST BE MARKED.
Your score is based solely on the number of questions you answer correctly. It is to your advantage to
answer every question.
The best strategy is to arrive at your own answer to a question before looking at the choices. Otherwise,
you may be misled by plausible, but incorrect, responses.
Multiple Choice
x 3 = / 75
Short Answer / 30
Total Points
Current Average % /
pf3
pf4
pf5

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LAREDO COMMUNITY COLLEGE

Science Department

CHEM 1405 Practice Exam # 3 ch. 3 Fall, 2008 Newton Name: ID # (last 4 digits) INSTRUCTIONS: Write your name on both portions of the exam and on the Scantron Answer Sheet. Fill in the following information on the Scantron Answer Sheet. Name Subject: CHEM 1405 Test No. Date: 11/07/06 Period: Section (M01) Circle the letter of the BEST answer(s) on the test here. When you have finished, use a #2 pencil and completely darken the letter(s) on the Scantron form which corresponds to your choice. If you make a mistake, erase the wrong answer completely. Each question is worth three (3) points.  Some questions may have more than one correct answer. In order to receive credit for the question, ALL CORRECT ANSWERS MUST BE MARKED.  Your score is based solely on the number of questions you answer correctly. It is to your advantage to answer every question.  The best strategy is to arrive at your own answer to a question before looking at the choices. Otherwise, you may be misled by plausible, but incorrect, responses.

Multiple Choice

x 3 = / 75

Short Answer / 30

Total Points

Current Average % /

LAREDO COMMUNITY COLLEGE

Science Department

CHEM 1405 Practice Exam # 3 ch. 3 Fall, 2008 1 Part I. Multiple Choice (75 pts) Circle the letter(s) corresponding to the BEST ANSWER(S). Then use a # 2 pencil to completely fill the space on the Scantron Answer Sheet which corresponds to each answer. Erase any incorrect answers or stray marks completely. Each question is worth three (3) points. Note: Only the answers marked on the Scantron Sheet will be graded.

  1. Atom has the smallest atomic radius of the halogen family. (A) F (B) Cl (C) Br (D) I (E) At
  2. The shape of a carbon atom as it bonds to four other atoms is a. (A) tetrahedron (B) pyramid (C) flat triangle (D) flat square (E) line
  3. In an ionic bond, electrons are shared between two atoms. (A) True (B) False
  4. Diamond is useful in electronic components because of its high thermal conductivity. (A) True (B) False
  5. Graphite and diamonds are two allotropes of carbon. (A) True (B) False
  6. Graphite is useful as a lubricant because. (A) it has strong covalent bonds in three dimensions. (B) its two-dimensional sheets slide easily across each other. (C) it contains only single carbon-carbon bonds (D) its triple bonds prevent it from forming a tree-dimensional network. (E) its double bonds are shorter and stronger than the single bonds in diamond.

Practice Exam # 3 ch. 3 Fall, 2008 Newton 3

  1. Carbon nanotubes may be useful in the electronics industry because their delocalized electrons allow them to act as semiconductors. (A) True (B) False
  2. Hydrogen can be stored in carbon nanotubes by making use of a(an) _____ reaction. The hydrogen is released when needed by a(an) _____ reaction. (A) addition; elimination (B) elimination; addition (C) addition; combustion (D) elimination; combustion (E) combustion; elimination
  3. The central atom in a molecule of CO 2 is oxygen. (A) True (B) False
  4. In order to obey the octet rule, a carbon atom always forms four single bonds. (A) True (B) False
  5. When drawing a Lewis structure that includes a nitrogen atom, the nitrogen atom will typically possess. (Choose all that are correct.) (A) two single bonds and two non-bonding pairs (B) one double bond, one single bond, and one non-bonding pair (C) one triple bond and one non-bonding pair (D) two double bonds. (E) three single bonds and one non-bonding pair
  6. The total number of electrons in ethanol, C 2 H 5 OH, is _____. (A) 4 (B) 8 (C) 12 (D) 20 (E) 26
  7. The number of single bonds in ethanol, C 2 H 5 OH, is _____. (A) 4 (B) 1 (C) 2 (D) 8 (E) 5
  8. The condensed structure of an ethyl group is represented as – CH 3. (A) True (B) False

Practice Exam # 3 ch. 3 Fall, 2008 Newton 4

  1. A semiconductor conducts electricity only under certain conditions because its electrons can move freely among the positive nuclei only when spaces are created by external influences. (A) True (B) False
  2. In the experiment on chemical reactions, the flame on the wood splint was extinguished when it was placed inside the test tube containing the mixture of sodium carbonate and hydrochloric acid because. (A) the carbon dioxide generated in the reaction replaced the oxygen in the test tube (B) the wood splint was placed in the hydrochloric acid in the test tube (C) sodium carbonate does not react with hydrochloric acid (D) the chlorine gas generated in the reaction replaced the oxygen in the test tube (E) the entire wood splint was consumed
  3. The products of a combustion reaction involving a hydrocarbon with sufficient air are. (A) carbon monoxide and ammonia (B) carbon dioxide and water (C) nitrogen dioxide and water (D) carbon dioxide and ammonia (E) sulfur dioxide and hydrogen cyanide
  4. In The Strange Case of Mole Airlines Flight 1023 , the body of passenger Archie Starr was found to have in his pockets. (A) dynamite (B) aspirin (C) nitroglycerin (D) Equal®^ (E) cocaine
  5. Passenger is assumed to have been murdered by prior to the crash of the airplane. (A) Jim LeClaire; Amadeo Oldere (B) Bill (Cadillac) Jackson; Connie Majors (C) Lisa Johnson; Norm Anderson (D) Norm Anderson; Lisa Johnson (E) Bob (Reno) Henderson; Bill (Cadillac) Jackson In addition to these questions, you will be asked some questions regarding the following:
  6. Recent lab experiments (Popcorn, Cations, Anions, Water of Hydration)
  7. Various functional groups Hydrocarbons alkane, alkene, alkyne, aromatic Alkyl halides, alcohols, ethers, aldehydes, ketones, acids, esters, amines, amides