(A) amine (B) alcohol (C) carboxylic acid (D) ester. (A) ester (B) aldehyde (C) carboxylic acid (D) alcohol
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1 Practice Smells Unit Test 1. Which function group is shown in the molecule below? C O H (A) amine (B) cohol (C) carboxylic acid (D) ester 2. What is the function group of the molecule shown below? (A) ester (B) dehyde (C) carboxylic acid (D) cohol 3. What is the smell of the molecule shown in Question 2? (A) fishy (B) camphor (C) minty (D) putrid 4. You have a liquid that smells putrid. Which chemic could it be? (A) butyric acid (B) ethyl acetate (C) phenylethylamine (D) 1-carvone 5. The shape of a molecule is determined by what principle? (A) Electron domains like to be as far apart from each other as possible. (B) Electron domains like to be as close to each other as possible. (C) Electron domains attract each other. (D) Electron domains have to be at 90 o angles from each other. 6. The shape of a SF 2 molecule is (A) tetrahedr (B) pyramid (C) bent (D) linear 7. The intermolecular forces that nonpolar molecules exhibit are cled (A) London disperson forces (B) dipole-dipole interactions (C) hydrogen bonding (D) none of these 8. Unless they are large molecules, nonpolar molecules are likely to be (A) liquids (C) solids (B) gases (D) plasma 9. The picture below is what type of representation of a molecule? (A) Lewis dot diagram (B) structur formula (C) molecular formula (D) bl-and-stick model
2 10. The strongest intermolecular forces are (A) hydrogen bonding (B) Van der Was forces (C) dipole-dipole interactions (D) London dispersion forces 11. What is the function group of the molecule pictured below? 12. Hydrogen bonding is (A) cohol (B) ketone (C) ester (D) dehyde (A) a very strong attraction between molecules that contain H bonded to N, O, or F (B) a bond that occurs between molecules that contain H bonded to N, O, or F (C) a very strong attraction that occurs between any molecules that contain H (D) a bond that occurs between molecules that contain H 13. The smell of rotten food would be (A) sweet (B) putrid (C) fishy (D) camphor 14. Nonpolar molecules have low boiling points (A) True (B) Fs 15. Nonpolar molecules evaporate easily (A) True (B) Fse 16. Polar molecules dissolve nonpolar molecules (A) True (B) Fse 17. The molecule CO2 (A) smells because it fits into a flat receptor site (B) smells because it is polar (C) does not smell because it is nonpolar (D) does not smell because it does not travel to the nose 18. The parts of your nose that low you to smell molecules are cled (A) nose hairs (B) nose buds (C) receptor sites (D) function groups 19. Which of these elements has the greatest electronegativity? (A) Fr (B) At (C) Li (D) O 20. If the electronegativity difference between two atoms is extremely sml (0.4 or less), what type of bond will they form? (A) ionic (B) polar covent (C) nonpolar covent (D) nonpolar ionic 21. The molecule HF (s)
3 (A) smells because it fits into a flat receptor site (B) smells because it is polar (C) does not smell because it is nonpolar (D) does not smell because it does not travel into the nose 22. Which of the following will smell? (A) sml polar molecules (B) mets (C) sml nonpolar molecules 23. You can only smell molecules that are in this phase. (A) gas (B) liquid (C) solid (D) aqueous 24. In order to smell a liquid, (A) the separate atoms in the liquid join together as they float out and form a molecule that floats to your nose. (B) the molecules in the liquid break apart into atoms that float to your nose. (C) the molecules in the liquid break apart into pieces that float into your nose. (D) the molecules in the liquid float out of the liquid and into your nose. 25. Polar molecules (A) are not attracted to a charge (B) do not have parti charges on parts of the molecule (C) are not attracted to each other (D) bend towards a charged wand 26. In a nonpolar covent bond, the electrons (A) are shared equly (B) are shared unequly (C) are not shared at l (D) are not involved in bonding 27. Which of these elements has the lowest electronegativity? (A) F (B) At (C) Li (D) Fr 28. If the electronegativity difference between two atoms is extremely large (greater than 2.0), what type of bond will they form? (A) ionic (B) polar covent (C) nonpolar covent (D) nonpolar ionic 29. Acetone is polar. Which of the following statements is correct? (A) Acetone will not smell. (B) Acetone will dissolve in water. (C) Acetone will dissolve in hexane. (D) Acetone will not be attracted toward a charged wand. 30. According to the smell rules, which substance should smell but does not? (A) copper (B) st (C) water (D) Styrofoam Short Answer 31. Complete the chart below. Formula Lewis dot diagram Number of Domains on Centr Atom Number of Lone Pairs on Centr Atom Sketch shape (use paddles to show lone pairs) Name of Shape AsH 3 CBr 4
4 32. What is the function group of the large molecule shown? (Different views of the same molecules are shown.) What is the smell of this chemic? Explain your reasoning. 33. Look at the molecule below. The electronegativity of S is 2.58, and Cl is Copy this picture on your paper and then the following questions. a. What is the difference in electronegativity of these two atoms? Is this a polar bond? b. Draw in the parti negative and parti positive charges. b. Using arrows, draw the directions of each dipole, and then draw the overl dipole for the molecule. c. Will this molecule smell? Why or why not? 34. A student conducts an experiment with miner oil. She finds that the oil is not attracted to a charged wand and that oil spreads out when placed onto wax paper. According to these results, is miner oil polar or nonpolar? Explain your. 35. Is the bond in the molecule HBr polar? On which end of the hydrogen bromide molecule would you find a parti negative charge? Would you expect HBr to have a smell? Explain your reasoning. 36. Complete the chart below (Be sure to cculate the electronegativity difference don t just assume a dipole exists). Formula Lewis Dot Diagram Geometry Polar or Nonpolar? Dissolves in water? Will it smell? Shape (name and sketch) *Show direction of l dipoles Symmet ric shape? All surroun ding atoms identica l? Type of IMF s? CH 4 H 2 Se NH 3 CO Using your table of electronegativities, place the bonds in order of increasing polarity: Si O Si H Si I Si F I I Answers: 1. B 2. C 3. D 4. A 5.A 6. C 7. A 8. B 9. B 10. A 11. A 12. A 13. B 14. A 15. A 16. B 17.C 18.C 19. D 20. C 21. B 22. A 23. A 24. D 25. D 26. A 27. D 28. A 29. B 30. C
5 Short Answer 31. Formula Lewis dot diagram Number of Domains on Centr Atom AsH 3 Number of Lone Pairs on Centr Atom Structur Formula 4 1 Name of Shape pyramid CBr tetrahedr 32. Ketone; minty, because it has the C=O bonded to two carbons on each side (you may so circle the function group in the structure as your explanation) 33. (a.) 0.58; polar (because the difference is greater than 0.4) (b.) S is δ+ and each Cl is δ- (because Cl is more electronegative than S) (c.)the arrows should point toward Cl from S (there should be two arrows for the two polar bonds), The arrow showing the overl dipole should point straight down (d.) Yes, it is polar. 34. Miner oil is nonpolar because it is not attracted to a charged wand and it does not bead up into a droplet. It does not have charges so cannot be attracted to a charged wand. The molecules are not attracted to each other because the molecules do not have parti charges, so it cannot form a droplet--it spreads out on wax paper. 35. HBr is polar because there is an electronegativity difference of 0.86 between the atoms. The parti negative charge would be on the Br because Bromine has a greater electronegativity then H and more strongly attracts the electrons. HBr would have a smell because it is a polar molecule that can dissolve in water in the nose so it can land on a receptor site. 36. Complete the chart below. Formula CH 4 H 2 Se NH 3 CO 2 Lewis Dot Diagram Geometry linear Shape (name and sketch) *Show direction of l dipoles Symmet ric shape? All surroun ding atoms identica l? Polar or Nonpolar? Dissolves in water? Will it smell? Type of IMF s? Yes Yes Nonpolar No No Londo n dispers ion (or van der was) no Yes Polar Yes Yes Dipole -dipole interac tions no Yes Polar Yes Yes Hydro gen bondin g yes yes nonpolar no no Londo n dispers ion (or van der was) 37. I-I, Si-H, Si-I, Si-O, Si-F
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