1. What is the letter of the alphabet in parentheses that follows EXAM I in the title above? a. a b. b c. c d. d e. e

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1 HEM 102, EXAM I ( a ) 1. What is the letter of the alphabet in parentheses that follows EXAM I in the title above? a. a b. b c. c d. d e. e 2. Which compound has the most constitutional isomers? a. 2 H 6 b. 12 H 26 c. 6 H 14 d. 7 H 16 e. 3 H 8 3. Which compound is incorrectly named? a. 8 H 16 octene b. 7 H 14 hexene [if you selected either b or d you got it right] c. 5 H 10 cyclopentane d. 4 H 8 butane [if you selected either b or d you got it right] e. 3 H 6 propene 4. Which compound will have the highest boiling point? a. hexane b. methane c. propane d. hexadecane e. butane 5. Which of the following compounds can exhibit cis-trans isomerism? a. H 2 =HH 2 Br b. H 3 H 2 H 3 c. H 3 H 2 OH 2 H 3 d. Br2=H2 e. BrH=HBr 1

2 6. Which of the compounds shown is aromatic (only four choices are shown)? a. H 2 =H-H=H 2 c. b. the six-carbon ring system with three alternating single and double bonds and a methyl group attached to the ring d. 7. In the fractional distillation tower at the petroleum refinery, which fraction is found at the very bottom of the tower? a. Fuel oil: 15 to 18 hydrocarbons b. Gasoline: 5 to 12 hydrocarbons c. Lubricating oils: 16 to 20 hydrocarbons d. Gases: 1 to 4 hydrocarbons e. Asphalt: > 20 hydrocarbons 8. The catalytic reforming process: a. Breaks long-chain hydrocarbons into shorter-chain hydrocarbons b. Separates a mixture of hydrocarbons into individual compounds c. onverts straight-chain hydrocarbons into branched-chain and aromatic hydrocarbons d. atalyzes the complete combustion of O to O 2 in the automobile exhaust e. All of the above 9. Which molecule below has a chiral center? a. methane b. ethane c. 2-bromobutane d. ethylene e. 2-butene 10. onsider the carbon skeleton shown below. How many different primary alcohols and secondary alcohols, respectively, can be made by adding an OH group to one of the carbons? a. two and three b. two and two 1 c. two and one d. three and two e. three and three

3 11. How many different tertiary alcohols can be made by adding one OH group to the carbon skeleton shown below? a. 0 b. 1 c. 2 d. 3 e In the oxidation of ethanol, the types of compounds (name them in sequence) that follow ethanol as it is oxidized in step-wise fashion are: a. aldehyde, primary alcohol b. aldehyde, carboxylic acid c. tertiary alcohol, aldehyde d. primary alcohol, aldehyde e. secondary alcohol, tertiary alcohol 13. Esters are produced by a process which can be characterized as a. a hydrolysis reaction b. a condensation reaction c. the reaction of alcohols with ketones d. both a and c above e. both b and c above 14. The reaction of three fatty acids with glycerol, an alcohol that contains three -OH groups, yields the biologically important class of compounds called a. Triglycerides b. Steroids c. Hallucinogens d. Amphetamines e. Polyethylene 15. Monomers used to produce addition polymers usually contain in their molecular structures. a. sulfur atoms b. double bonds c. benzene rings d. branched carbon chains e. two or more different functional groups 3

4 16. The following reaction produces which polymer below (only four choices are shown)? a. b. c. d. the repeating unit beginning with a =O on the left and ending with an O on the right 17. The starting materials for polyamide are not amides. What pair of compounds below will form a polyamide? a. A dicarboxylic acid and a diamine b. A diamine and an alcohol having one hydroxyl group c. A monocarboxylic acid and an alcohol having one hydroxyl group d. A dicarboxylic acid and an ester e. A diester and a diamine. 18. The peptide linkage found in proteins is chemically the same as a. an ionic bond. b. a double bond. c. an ester linkage. d. an amide linkage. e. a hydrogen bond. 19. What is the primary function of cellulose? a. energy storage in plants b. energy storage in animals c. structural support for plants d. catalysis of biochemical reactions e. transport of biologically important molecules 4

5 20. For the rate of the reaction A + + OH - A-OH, a scientist wrote, Rate = (-Δ[A + ])/( Δt ). Which statement below is true? a. He expressed rate as disappearance of OH -. b. He expressed rate as disappearance of A +. c. He expressed rate as appearance of A-OH. d. He expressed rate as appearance of A +. e. He expressed rate as appearance of OH At the triple point in a unary (one substance) phase diagram, which is false? a. The temperature is the same in all three phases b. The pressure is the same in all three phases c. There are no degrees of freedom d. The relative amounts of the three phases present is not restricted e. All above are false 22. When heat is being transferred from surroundings to system at constant pressure, the temperature of the system does not change if: a. The system is undergoing a phase change from liquid to gas b. The system is all liquid c. The system is all solid d. The system is all gas 23. Which statement below is true for rate constant, k? a. The rate constant can be computed from the coefficients of the reactants. b. The rate constant can be computed from the coefficients of the products. c. The rate constant must be computed from the coefficients of reactants and products. d. The rate constant must be determined by experiment. e. The rate constant can be computed from the order of the reaction. 24. Which statement about metallic bonding is not correct? a. In the presence of an electrical field, the electrons migrate toward the positive charge. b. The valence electrons are not trapped around a particular nucleus, but can move freely. c. There are no valence electrons. d. Freely moving valence electrons are described as an "electron sea." e. The metal nuclei behave as negatively charged ions. 25. Doping silicon (4 valence electrons) with gallium (3 valence electrons) results in that become the charge carriers; the doped silicon is called -type semi-conductor. a. holes ; n-type. b. extra electrons; p-type. c. holes; p-type. d. extra electrons; n-type. e. none of the above are correct. 5

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