Practice Exam IV with answers

Practice Exam IV with answers - General Chemistry II Sample...

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Unformatted text preview: General Chemistry II Sample Exam IV, 100 Points McCallum You have 80 minutes to complete this exam. You may use a calculator, 3 5 card, and the provided periodic table and equation sheet. Please box or otherwise indicate answers clearly. Ambiguous or unreadable work will not be graded. Read the questions carefully!! To be used only if you request a re-grade or grading correction: I wish to turn in this exam in for a possible re-grade. I have attached a note to indicate where I think the mistake was. I have not altered or added to my original answer in any way. I understand that altering an exam for a re-grade is considered cheating and will result in being reported to the Dean of Student Life for disciplinary action in addition to a grade of F for the course. (signed) Date Name: Student I.D.: Name: Student No.: 2 Multiple Choice questions. 50 Points Choose the best answer from the list of choices. Use your scantron sheet and mark each answer clearly. Be sure to fully erase all changes. 1. Chromium metal crystallizes as a body-centered cubic lattice. If the atomic radius of Cr is 1.25 A, what is the density of Cr metal in g/cm 3 ? (a) 5.52 (b) 7.18 (c) 7.81 (d) 2.76 (e) 3.59 2. Which of the following has the lowest boiling point? (a) CF 4 (b) HF (c) Cu (d) KI (e) SiF 4 3. Which statement concerning water is true? (a) Energy must be given off in order to break down the crystal lattice of ice to a liquid. (b) Hydrogen bonds are stronger than covalent bonds. (c) Liquid water is less dense than solid water. (d) Only covalent bonds are broken when ice melts. (e) All of these statements are false. 4. Which of the following is the correct order of boiling points for KNO 3 , CH 3 OH, C 2 H 6 , and Ne? (a) Ne < CH 3 OH < C 2 H 6 < KNO 3 (b) KNO 3 < CH 3 OH < C 2 H 6 < Ne (c) Ne < C 2 H 6 < KNO 3 < CH 3 OH (d) Ne < C 2 H 6 < CH 3 OH < KNO 3 (e) C 2 H 6 < Ne < CH 3 OH < KNO 3 5. The unit cell in thie two-dimensional crystal contains Xs and Os. X X X X O O O O X X X X O O O O X X X X O O O O (a) 1,1 (b) 2,1 (c) 1,2 (d) 4,1 (e) 1,4 Name: Student No.: 3 6. A certain solid substance that is very hard, has a high melting point, and is nonconducting unless melted is most likely to be: (a) I 2 (b) NaCl (c) CO 2 (d) H 2 O (e) Cu 7. In any cubic lattice, an atom lying at the corner of a unit cell is shared equally by how many unit cells? (a) 1 (b) 2 (c) 4 (d) 6 (e) 8 8. The bonds between hydrogen and water in a water molecule can be characterized as: (a) hydrogen bonds (b) London dispersion forces (c) intermolecular forces (d) intramolecular forces (e) dispersion forces 9. Doping Se with As would produce a(n) semiconductor with conductivity compared with pure Se....
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This note was uploaded on 04/07/2008 for the course CHEM 027 taught by Professor Mccallum during the Spring '08 term at Pacific.

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Practice Exam IV with answers - General Chemistry II Sample...

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