Midterm Exam 1 Answer Key

Midterm Exam 1 - NAME A!” Mr(2 Midterm Examination I CHM 231 Spring 2007 Dr Gust Time limit 50 minutes 7 Total points = 100 Answer on Pearson

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: NAME A!” Mr [(2 Midterm Examination I CHM 231 Spring, 2007 Dr. Gust Time limit: 50 minutes 7 Total points = 100 Answer on Pearson machine-grading sheets by marking response A, B, C, D or E. BE SURE TO ENTER YOUR LAST AND FIRST NAMES, AND YOUR 10-DIGIT ASU ID NUMBER ON THE FORM. DO NOT SUPPLY YOUR BIRTH DATE. THE QUESTIONS BELOW ARE EACH WORTH 3 POINTS 1. What is the ground-state electronic configuration for nitrogen (atomic number 7)? (A) 1822822px22py22p21 (B) [He12522px22py‘2pz' (C) [Ne13s23px23pylspz‘ 19.2232ngng2p,1 (E) ISZZSZpr22py22p22 2. How many electrons are in the valence shell of carbon? (A) 1 (B) 2 (C) 3 4 (E) 5 3. Does the bond below have its polarity indicated correctly? C—F yes (B) no 5* 3* ® 4. Which element has the electronic configuration 1s22522px12py]? (A) Ne (B) F (C) 0 c (E) s 5. Which is a correct Lewis structure for the acetate ion, CH3C02_‘? ITI 0 ti o '7' '5 = F.' ‘5" H-H H-H H-H - H~H< H ‘Qé H =96; H ‘99 H 9s (A) (c) (D) 10. ll. 12. NAME Which bond in sodium acetate, CH3C00Na, is the most ionic? (A) C-H O-Na (C) 0-0 (D) C-O (E) C-C' Which bond is most polar? (A) C-H (B) C-Cl @C-F (D) C-O Which of the following molecules is a ketone? [.0 ,9 ,9 HaC-Q H30—C Hac—c (A) CH30H2~OH CH3 (C) ‘H (D) \OH Using the VSEPR model, predict the bond angles for the atom in the box. (A) 180° (B) 90° (C) 109.50 120° What is the hybridization of the atom in the box in problem 10? (A) sp (B) sp3 (@sp2 In the acid-base reaction below, what is the conjugate base of hydrochloric acid (HCl)? (D) s31.) (D) szp NH3 + HCl —> NH4+ + Cl" (C) NH4+ CI‘ The pKa of ethanol is 15.9, whereas the pKBl of phenol is 9.95. Which is the stronger acid? henol (A) PF (B) P130+ (E) NHz' (A) ethanol NAME 13. A Lewis acid is: (A) a proton acceptor (B) an electron pair donor 14. Judging from its relative position in the periodic table, which element in the set below is most electronegative? (A) B (B) s ' @o (D) c (E) N Consider the following alcohols a through e: c a b OH H OH OH H (gr-Ion - H CHZCHon Q Ca OH H OH 0‘ e 15. Which structural formulas represent the same compound? (A) a & b & c b & c- (C) a & b (D) d and e 16. Which structural formulas represent constitutional isomers? ‘ A bandc candd (C) dande (D) aandb ' NAME 17. Which structural formulas represent stereoisomers? (A) b and c (B) c and d C d and e ®i a and b 18. Which is the correct IUPAC name for the molecule whose structure is shown below? A/CV (A trans-4-propenyloctene (B) cis-S-propyl-S-octene cis-4-propyl-3-octene (D) trans-4-butyl-3—heptene 19. Which statement about stereoisomers isomers is not true? (A) Stereoisomers have the same molecular formula. (B) Stereoisomers have the same molecular weight. Stereoisomers have different connectivity of atoms. (D) Stereoisomers have a different arrangement of atoms in space. 20. Which of the following molecules has the trans configuration at the multiple bond? 0“ 0 (A) M (C) (D) —=- 21. In the E, Z nomenclature system, which group below has the highest priority? (A) —(:H3 (B) —F (C) —H —SH (E) —-—OH 22. Which of the following alkenes shows cis—trans isomerism? (A) lspentene“ (B) 3-ethyl-2-pentene @2-pentene (D) 2-methyl-2-hexene NAME The natural product farnesol is shown below. OH 23. How many isoprene units does farnesol contain? (A) 15 (B) 1 3 (D) 4 24. Is farnesol a terpene‘? (A) yes (B) no 25. Branched alkanes boil at lower temperatures than straight-chain alkanes with the same number ot‘carbon atoms. @ true (B) false 26. Puffer fish (fugu) and some newts contain the same toxin. (A) true (B) false THE QUESTIONS BELOW ARE EACH WORTH 2 POINTS 27. Which is the most stable conformation of the compound shown below. WSH wH H SH (A) (B) 28. The combustion of alkanes with oxygen to form C02 and water is an exothermic reaction. (B) false GAD true U1 NAME _ 29. Cis and trans isomers are found only in alkenes. (A) true false 30." In the Phoenix area, natural gas consists mainly of propane. (A) true false 31. Acetylene is an example of an alkyne. true (B) false Consider the reaction coordinate diagram shown below for the following reaction in which reactants A and B yield products I) and E. A+B~+D+E Reaction coordinate 32. Is the overall reaction endothermic or exothermic? (A) Endothermic Exothermic 33. Are the products more stable or less stable than the reactants? More stable (B) Less stable . 34. 35. 36. 37. NAME Which of the three energies indicated with vertical lines represents the overall heat of reaction, AH? _ _ _ (A) E; (B) IE2 [email protected] This is a two-step reaction that occurs by way of an intermediate. Which is the intermediate? (A) structure B structure C Which step of the reaction has the largest activation energy? step 1 What is the transition state for the second step of the reaction? (C) structure F (D) structure G (B) step‘2 (C) step 3 (A) structure B (B) structure C (C) structure F structure G ...
View Full Document

This note was uploaded on 04/27/2009 for the course CHM 231 taught by Professor Gust during the Spring '09 term at University of Arizona- Tucson.

Page1 / 7

Midterm Exam 1 - NAME A!” Mr(2 Midterm Examination I CHM 231 Spring 2007 Dr Gust Time limit 50 minutes 7 Total points = 100 Answer on Pearson

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online