unit 9 practice test (organic and biochem)

Name: Class: Date: unit 9 practice test (organic and biochem) Multiple Choice Identify the choice that best completes the statement or answers the question. 1. What s the correct formula for the simplest alkene that contains six carbon atoms? a. C 6 H 12 b. C 6 H 10 c. C 6 H 8 d. C 6 H 14 e. C 6 H 16 2. What s the correct formula for the simplest alkene that contains seven carbon atoms? a. C 7 H 14 b. C 7 H 12 c. C 7 H 10 d. C 7 H 16 e. C 7 H 18 3. What is the name of the following compound? a. 4,5-dihexane b. 2,3-diethylhexane c. 4,5-dimethane d. 2,3-dimethylhexane e. 4,5-dimethylhexane 4. What is the name of the following compound? a. 3-methyl-5-ethylheptane b. 3,5-diethylhexane c. 2-methyl-4-ethylpentane d. 2,4-diethylhexane e. 5-ethyl-3-methylheptane 1

Name: 5. What is the name of the following compound? a. 4-methyl-2-pentyne b. 4,4-dimethylbutyne c. 4,4-dimethyl-2-butyne d. 2-methyl-3-pentyne e. 2-methyle-3,4-pentadyne 6. What is the molecular formula for 2,3,4-trimethyl-5-heptene? a. C 8 H 18 b. C 9 H 20 c. C 10 H 20 d. C 10 H 22 e. C 11 H 22 7. An unsaturated hydrocarbon is a. a compound in which carbon atoms have double or triple bonds. b. a compound in which all carbon atoms have four single bonds. c. a hydrocarbon that contains oxygen. d. a cycloalkane with five or more carbons. e. a hydrocarbon that is a gas at room temperature. 8. Which of the following molecules is ethanol? a. C 2 H 6 b. CH 3 CO 2 H (the order of the atoms explains the structure: ) c. CH 3 CHO (another example: ) d. CH 3 CH 2 OH e. CH 3 OCH 3 2

Name: 9. The compound below is an. a. alkyne b. alkene c. alkane d. aromatic compound e. olefin 10. What is the name of the compound below? a. 2,4-methylbutene b. 2,5-dimethylpentane c. 2,4-ethylbutene d. 2,4-dimethyl-1-pentene e. 2,4-dimethyl-4-pentene 11. Gasoline and water do not mix because gasoline is. a. less dense than water b. less viscous than water c. nonpolar and water is polar d. volatile and water is not e. polar and water is nonpolar 12. The general formula of an aldehyde is. a. R O R' b. R CO R' c. R CO OH d. R CHO e. R CO OR' 3

Name: 13. The general formula of a carboxylic acid is. a. R O R' b. R CO R' c. R CO OH d. R H e. R CO OR' 14. The compound below is a(n). a. carboxylic acid b. ketone c. aldehyde d. ester e. amine 15. Starch, glycogen, and cellulose are made of repeating units of. a. lactose b. glucose c. fructose d. sucrose e. amino acids 16. Alcohols are hydrocarbon derivatives in which one or more hydrogens have been replaced by a hydroxyl functional group. is the general formula of an alcohol. a. R O R b. R CO R c. R CO OH d. R OH e. R CO H 17. What is the general formula for a ketone? a. R O R b. R-CO-R' c. R CO OH d. R OH e. R CHO 4

Name: 18. Which structure below represents a ketone? a. b. c. d. e. 5

Name: 19. Which structure below represents an aldehyde? a. b. c. d. e. 20. Proteins are biopolymers formed via multiple condensation coupling of which two functional groups? a. ester and amine b. amine and carboxylic acid c. alcohol and carboxylic acid d. alcohol and amine e. ester and carboxylic acid 6

Name: 21. Which of the following contains a peptide linkage? a. b. c. d. e. none of the above 22. Sugars are examples of what type of molecule? a. proteins b. carbohydrates c. nucleic acids d. amino acids e. salts 23. is a monosaccharide. a. Sucrose b. Maltose c. Glucose d. Lactose 24. Which one of the following is a monosaccharide? a. fructose b. lactose c. sucrose d. maltose e. none of the above 7

Name: 25. Which of the following amino acids is hydrophobic? a. b. c. d. e. 26. An example of a secondary structure of a protein is a. an alpha amino acid b. a peptide linkage c. an alpha helix d. serine e. none of these 27. The process of breaking down the three-dimensional structure of a protein is called a. degradation b. denaturation c. decomposition d. fission e. none of these 28. A glycerol molecule bonded to 3 fatty acid molecules is known as a a. diglyceride b. polymer c. amino acid d. triglyceride e. trisaccharide 8

Name: 29. Reacting monomers with each other to create a long chain of monomers is known as a. thermosetting b. denaturation c. polymerization d. peptide bond e. saturation Completion Complete each statement. 30. Large protein molecules that act as catalysts are called. 31. The condensation reaction of a carboxyl group of one amino acid and the amino group of a second amino acid results in the formation of a. True/False Indicate whether the statement is true or false. 32. True or false? Starch and cellulose are both polymers of glucose. 33. Unsaturated fats are primarily liquids at room temperature because they have double bonds which break up the uniformity of the chains which weaken intermolecular forces. 34. Amorphous polymers have narrow melting points that can easily be predicted. Short Answer 35. Describe the differences between Chain Reaction (addition) polymerization and Step-Reaction (condensation) polymerization. 36. Describe the differences between thermoplastics and thermosets. 9

unit 9 practice test (organic and biochem) Answer Section MULTIPLE CHOICE 1. ANS: A PTS: 1 DIF: easy TOP: alkene nomenclature KEY: IUPAC nomenclature MSC: organic chemistry 2. ANS: A PTS: 1 DIF: easy TOP: alkene nomenclature KEY: IUPAC nomenclature MSC: organic chemistry 3. ANS: D PTS: 1 4. ANS: E PTS: 1 5. ANS: A PTS: 1 6. ANS: C PTS: 1 7. ANS: A PTS: 1 8. ANS: D PTS: 1 9. ANS: A PTS: 1 DIF: 1 REF: Sec. 25.3 10. ANS: D PTS: 1 DIF: 1 REF: Sec. 25.3 11. ANS: C PTS: 1 DIF: 1 REF: Sec. 25.3 12. ANS: D PTS: 1 DIF: 1 REF: Sec. 25.4 13. ANS: C PTS: 1 DIF: 1 REF: Sec. 25.4 14. ANS: B PTS: 1 DIF: 1 REF: Sec. 25.4 15. ANS: B PTS: 1 DIF: 1 REF: Sec. 25.8 16. ANS: D PTS: 1 DIF: 1 REF: Sec. 25.4 17. ANS: B PTS: 1 DIF: 1 REF: Sec. 25.4 18. ANS: D PTS: 1 DIF: 1 REF: Sec. 25.4 19. ANS: C PTS: 1 DIF: 1 REF: Sec. 25.4 20. ANS: B PTS: 1 DIF: 1 REF: Sec. 25.7 21. ANS: A PTS: 1 DIF: 1 REF: Sec. 25.7 22. ANS: B PTS: 1 DIF: 1 REF: Sec. 25.8 23. ANS: C PTS: 1 DIF: 1 REF: Sec. 25.8 24. ANS: A PTS: 1 DIF: 1 REF: Sec. 25.8 25. ANS: D PTS: 1 26. ANS: C PTS: 1 DIF: easy TOP: proteins and amino acids physical structure of protein KEY: secondary structure MSC: biochemistry 27. ANS: B PTS: 1 DIF: easy TOP: proteins and amino acids protein denaturation MSC: biochemistry 28. ANS: D PTS: 1 29. ANS: C PTS: 1 COMPLETION 30. ANS: enzymes PTS: 1 DIF: 1 REF: Sec. 25.7 1

31. ANS: peptide bond PTS: 1 DIF: 1 REF: Sec. 25.7 TRUE/FALSE 32. ANS: T PTS: 1 DIF: easy TOP: carbohydrates polysaccharide KEY: common polysaccharide MSC: biochemistry 33. ANS: T PTS: 1 34. ANS: F PTS: 1 SHORT ANSWER 35. ANS: Addition: fast, makes very large molecules, requires a free radical to break double bond in monomer, then process continues to add monomers until termination by another free radical. single bonds are more stable and require less energy than double bonds, making this reaction exothermic Condensation: slower, makes smaller molecules, 2 monomers react and give off a by-product which opens a bonding site for the molecules to connect and form a dimer. high temps are required for this reaction. PTS: 1 36. ANS: thermoplastics: linear, soften upon heating, can be remolded, strong bonds within chain, weak bonds between chains, can be heated remolded, cooled, and will retain new shape thermosets: do not soften, cannot be remolded, strong bonds within and between chains, contain cross-linking PTS: 1 2