Partial preview of the text
Download CHEM 120 EXAM 2 QUESTIONS WITH VERIFIED ANSWERS LATEST UPDATE 2024 and more Exams Chemistry in PDF only on Docsity!
CHEM 120 (Hamann) Exam 2 Last First PartI ‘60 Total of 137 exam points, adjusted to 100 course points. / Part II 139 ADJUSTED SCORE: Part ITI /38 Part I: Multiple Choice (3 points each, 60 pts total, No guessing correction, so answer ALL questions) Note, only questions that are marked as such might have multiple correct answers. Use the following answers for Numbers 1-24 (12 questions) AA: Alkanes AB: Alkenes AC: Alkynes AD: Aromatics AE: Alkyl Halides BA: 1° Alcohols BB: 2° Alcohols BC: 3° Alcohols BD: 1° Amines BE: 2° Amines CA: 3° Amines CB: 4° Ammonium Salts CC: Aldehydes CD: Ketones CE: Hemiacetals DA: Acetals DB: Carboxylic Acids DC: Esters DD: 1° Amides DE: 2° amides EA: 3° Amides EB: Phenols EC: Ethers ED: Thiols EE: Monosulfides EC: Disulfides To answer these questions requires two lines on the Scantron, one for each letter of the answer. For example: 1-2. Which functional group results in the smelliest compounds? The answer is ED: Thiols. Therefore, you would bubble in E on line 1 on the Scantron, and D on line 2. The order matters (answering DE would be wrong, as that would indicate your answer is 2° amide which is wrong), and both lines are graded together as a single question. Answer this question now on lines 1-2 to get credit for this question. 3-4. Which functional group has a carbonyl group attached to both a carbon and to a hydrogen? CC: Aldehyde 5-6. Which functional group is made by the gentle oxidation of a thiol? EC: Disulfides 7-8. Which functional group is the condensation product of a 1° amine and a carboxylic acid? DE: 2° Amides - a new group is added to the amine to become an amide! 9-10. Which functional group is the most acidic? DB: Carboxylic Acids - phenol common wrong answer 11-12. Which functional group undergoes saponification? DC: Esters 13-14. Which functional group give compounds the highest boiling point? DD: 1° Amides 15-16. Which functional groups has a set of carbon-carbon double bonds with unusual stability? AD: Aromatics 17-18. Which functional group promotes more soluble in aq NaOH than in water, but not more solubility in aq NaHCO3? EB: Phenols - carboxylic acid common wrong answer, but they are more soluble in NaHCOs ; thiol would also be correct, and credit was given to those (who guess this?) 19-20. Reduction of which functional group gives a 1° alcohol? CC: Aldehydes (others we didn't learn) 21-22. Which functional group is most unstable in water? CE: Hemiacetals - I said in lecture you can't put them in a bottle because they are in equilibrium with alcohol and aldehyde/ketone 23-24. Which of these functional groups reacts with acid to form a salt and does not self-hydrogen bond? CA: 3° Amines - I should have seen the simple structures on many exam that would make this easier 
