1C Han practice final-1

1C Han practice final-1 - CLAS Chem 1C Practice Final 1....

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CLAS Chem 1C Practice Final 1. Which of the following atoms is the most electronegative: (A) K (B) F (C) Mg (D) C (E) Cs 2. Which of the following statements is correct: (A) A double bond is composed of two σ bonds (B) A triple bond is composed of three π bonds (C) Multiple bonds are stronger than single bonds (D) Single bonds are stronger than multiple bonds (E) Single bonds are shorter than multiple bonds 3. Which of the following molecules has the shortest carbon-oxygen bond length: (A) CH 3 OH (B) CO (C) CO 2 (D) CO 3 2- (E) They are all equal 4-5. Predict the molecular structure and the angle closest to the bond angles for NH3 4: shape 5: bond angle (A) linear (B) square planar (C) tetrahedral (D) trigonal planar (E) trigonal pyramid (A) 90 o (B) 107 o (C) 45 o C (D) 120 o (E) 180 o 6. In which of the following processes will energy by released (in the form of heat)? (A) sublimation (B) melting (C) vaporization (D) condensation (E) none of these For questions 7-13 consider phenylalanine, pictured here:
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7. What type of molecule is this? (A) amino acid (B) ester (C) coordination complex (D) salt (E) diatomic 8. In this diagram all carbon atoms and most hydrogen atoms are omitted. What is the molecular formula of this molecule? (A) H 3 NO 2 (B) C 9 H 3 NO 2 (C) C 6 H 8 NO 2 (D) C 9 H 11 NO 2 (E) C 9 H 11 NO 11 9. What is the total number of electrons that must be shown (including all bonds and lone pairs) in the complete Lewis structure of this molecule? (A) 12 (B) 64 (C) 84 (D) 52 (E) 48 10. What is the hybridization of the carbon atom labeled α? (A) sp3 (B) it is not hybridized (C) sp (D) d2sp3 (E) sp2 11. What is the hybridization of the carbon atoms that form the six membered ring? (A) sp3 (B) it is not hybridized (C) sp (D) pd (E) sp2 12. How many electrons are involved in π bonding? (A) 0 (B) 2
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(C) 4 (D) 6 (E) 8 13. What is the approximate C-O-H angle between the 2 bonds of the oxygen atom indicated in the figure? (A) 180 o (B) 90 o (C) 120 o (D) 0 o (E) 104.5 o 14. Which of the following resonance forms is used in the best representation of the structure of N 2 O? (A) 1 (B) 2 (C) 3 (D) All three forms (E) None of these 15. Which of the following have bond order 0.5: (A) H 2 ¯, H 2 and H 2 + (B) H 2 ¯, H 2 + and He 2 + (C) H 2 and He 2 (D) B 2 and Li 2 (E) O 2 16. Which of the following is paramagnetic: (A) C 2 (B) N 2 (C) F 2 (D) O 2 (E) H 2 17. CO 2 is a greenhouse gas because it absorbs heat radiation from the earth. It has the following Lewis structure ::O=C=O:: Which is a true statement: (A) CO 2 has a measurable permanent dipole (B) CO 2 has no measurable permanent dipole but it can have a dynamic dipole (from a bending vibration) (C) CO 2 never has any dipole (and so it never absorbs IR radiation) (D) none of the above (E) all of the above 18. Which of these molecules has a measurable permanent dipole: (A) H 2
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(B) CH 4 (C) CO 2 (D) H 2 O (E) SF 6 19. Which has the most polar bond? (A) H-Cl
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1C Han practice final-1 - CLAS Chem 1C Practice Final 1....

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