1. Which of the following has the lowest vapor pressure? A) H 2 O B) NaCl C) NH 3 D) O 2 E) CH 4

Transcription

1 Name: Date: 1. Which of the following has the lowest vapor pressure? A) H O B) NaCl C) NH 3 D) O E) CH 4. Which of the following species exhibit hydrogen bonding? (Check all that apply.) A) HBr B) NO 3 C) H O D) SF 4 E) KrCl 4 F) I 3 3. Which of the following should have the lowest boiling point? A) CH 4 B) C H 6 C) C 3 H 8 D) C 4 H 10 E) C 5 H 1 4. Identify the strongest intermolecular force in CH 4 A) dipole-dipole B) London dispersion C) ionic D) hydrogen bonding E) none of these 5. The total mass of a solution is 189. g. The solvent mass is 15. g. What is the mass percent of the solute? A) 66. % B) 44.8 % C) 33.8 % D).7 % E) Not enough information is given. Page 1

2 6. If you mix 0.0 ml of a 3.00 M sugar solution with 30.0 ml of a 5. M sugar solution, you will end up with a sugar solution of. A) 4.11 M B) M C) 7. M D) 4.33 M E) M 7. A sample of a radioactive element decays to 6.44% of its original number of radioactive nuclides in 36 years. What is the half-life of this radioactive element? A) 67 years B) 375 years C) 4.5 years D) 18 years E) 9.1 years 8. Alpha particles are A) electrons B) protons C) neutrons D) helium nuclei E) X rays 9. Complete the table for these radioactive particles: Name Charge Mass Number Alpha Beta Gamma 10. What is the correct formula for the saturated alkane that contains four carbon atoms? A) C 4 H 4 B) C 4 H 6 C) C 4 H 8 D) C 4 H 1 E) C 4 H 10 Page

3 11. The condensation product of two amino acids is a(n) A) peptide B) ketone C) ether D) ester E) alcohol 1. Lead has three stable isotopes Pb-06, Pb-07, and Pb-08. Pb-0 is radioactive though it has a long half life compared to other unstable isotopes (Pb-01 t1/ = 9 hours, Pb-0 t1/ = 53,000 years, Pb-03 t1/ = 5 hours). Suggest a reason for the long half life of Pb-0. A) it has a magic number of neutrons B) it has a magic number of protons C) it has an even number of protons D) it has Z less than If a radiation worker was exposed to 0.37 RAD of neutrons while at work, how many barium enemas could she have and still stay under the yearly limit of 5.0 REM? Each barium enema delivers 0.40 RAD. A) 4 B) 3 C) 8 D) Which has the higher [H + ], 0.0 M NaOH or 0.10 M Ca(OH)? A) 0.0 M NaOH B) 0.10 M Ca(OH) C) The [H + ]'s are equal. D) The answer depends on the volumes of the respective solutions. 15. A solution with a ph of.17 is A) basic B) acidic C) neutral Page 3

4 16. What is the ph of a solution prepared by dissolving g NaOH in enough water to make L of solution? A) 0.16 B) C) D) 1.6 E) none of these 17. A weak acid, HF, is in solution with dissolved sodium fluoride, NaF. If HCl is added, which ion will react with the extra hydrogen ions from the HCl to keep the ph from changing? A) OH - B) Na + C) F - D) HF - E) none of these 18. Which of the following statements is TRUE? A) A gene is a protein carries the instructions for the production of DNA. B) A codon is a sequence of 3 amino acids that codes for a single strand of DNA. C) transcription is the transfer of the codons from DNA into messenger RNA D) all of the above are true. 19. Which of the following link together the fatty acid and glycerol in a triglyceride? A) hydrogen bonds B) glycosidic linkages C) peptide bonds D) ester linkages 0. The function of an enzyme in the body is A) regulate body functions B) to catalyse reactions C) transport oxygen D) acts as an energy source Page 4

5 1. Which of the following is a carbohydrate? A) C 16 H 3 O B) C 6 H 1 O C) C 6 H 6 D) C 1 H O 11. Which of the following is a monosaccharide? A) sucrose B) maltose C) lactose D) galactose 3. Amino acids linked together by amide linkages that have a molecular mass of 10,000 g/mol or greater are called a A) DNA B) a polysaccharride C) a protein D) a polypeptide 4. Name the following molecule. 5. Which of the following is an amine? A) CH 3 NH B) CH 3 CONH C) CH 3 CO H D) CH 3 COCH 3 6. Which of the following is a ketone? A) CH 3 NH B) CH 3 CONH C) CH 3 CO H D) CH 3 COCH 3 Page 5

6 7. Which of the following is a carboxylic acid? A) CH 3 NH B) CH 3 CONH C) CH 3 CO H D) CH 3 COCH 3 8. Which of the following is an amide? A) CH 3 NH B) CH 3 CONH C) CH 3 CO H D) CH 3 COCH 3 9. Which of the following is an alcohol? A) CH 3 OH B) CH 3 CONH C) CH 3 CO H D) CH 3 COH 30. Which of the following is an ester? A) CH 3 OH B) CH 3 CO CH 3 C) CH 3 CO H D) CH 3 COH 31. Which of the following is an aldehyde? A) CH 3 NH B) CH 3 CONH C) CH 3 COH D) CH 3 COCH 3 3. A solution is prepared by dissolving 4.00 g of Na SO 4 in enough water to make 5 ml of solution. Calculate the solution molarity. A) 0.08 M B) 0.90 M C) M D) 0.15 M E) M Page 6

7 33. Consider the reaction HC H 3 O (aq) + H O(l) H 3 O + (aq) + CH3O (aq). Which species is the conjugate acid? A) HC H 3 O (aq) B) H O(l) C) H 3 O + (aq) D) CH3O (aq) E) two of these 34. A solution where [H + ] = M is. A) basic B) neutral C) acidic D) strongly acidic E) two of these 35. A solution has a ph of The [H + ] in this solution is A) M B) M C) 9.83 D) 4.17 E) none of these 36. Which of the following is true for a buffered solution? A) The solution resists any change in its [H + ]. B) The solution will not change its ph very much even if a concentrated acid is added. C) The solution will not change its ph very much even if a strong base is added. D) Any H + ions added will react with a conjugate base of a weak acid already in solution. E) all of these 37. True or false? A catalyst is a substance that speeds up a reaction without being consumed. A) True B) False 38. True or false? A minimum energy called the activation energy is needed for a reaction to occur. A) True B) False Page 7

8 39. True or false? At equilibrium, the concentrations of all reactants and products are constant. A) True B) False 40. True or false? At equilibrium, the concentrations of all reactants and products are equal. A) True B) False 41. If the reaction below was at equilibrium what would happen if more CaCO 3 were added? CaCO 3 (s) CaO(s) + CO (g) A) More CaO would be produced. B) The concentration of CO (g) would decrease. C) The amount of CaCO 3 would decrease. D) The pressure would increase. E) Nothing would happen. 4. Write the equilibrium expression for the following reaction: S(s) + O (g) SO (g) A) K = [SO ] [O ] B) [O ] K = [SO ] C) [SO ] K = [O ] D) [SO ] K = [O ] E) none of these Page 8

9 43. In the following reaction, which element is oxidized? 8NaI + 5H SO 4 4I + H S + 4Na SO 4 + 4H O A) sodium B) iodine C) sulfur D) hydrogen E) oxygen 44. Balance the following half-reaction that occurs in acidic solution: SO 3 - (aq) SO 4 - (aq) 45. What is the oxidation state of fluorine in CF 4? A) +4 B) -4 C) -1 D) 46. What is the oxidation state of oxygen in O? A) 0 B) - C) + D) Hydrolysis of a carboxylic acid derivative results in A) condensation of an ester B) formation of the carboxylic acid and water C) formation of a fatty acid D) formation of an aldehyde and water E) A carboxylic acid and a molecule with another functional group (alcohol from an ester, amine from an amide etc.) 48. DNA is composed of A) fatty acid + glycerol B) phosphate + sugar + nucleotide C) amino acids linked by peptide bonds D) a polymer of nucleotides Page 9

10 49. Hormones A) are vitamins made by the body B) can be polypeptides, proteins, or small molecules like testosterone C) are biological catalysts D) are molecules broken down as a source of energy 50. Which of the following is formed in a condensation reaction? A) ester B) disaccharride C) amide D) all of the above Page 10

11 Answer Key 1. B. C 3. A 4. B 5. C 6. D 7. E 8. D 9. Name Charge Mass Number Alpha 4 Beta -1 0 Gamma E 11. A 1. A 13. B 14. C 15. B 16. C 17. C 18. C 19. D 0. B 1. D. D 3. C 4. -methylbutane 5. A 6. D 7. C 8. B 9. A 30. B 31. C 3. D 33. C 34. A 35. B 36. E 37. A 38. A 39. A 40. B 41. D Page 11

12 4. A 43. B 44. SO 3 - (aq) + H O(l) SO 4 - (aq) + H + (aq) + e A 46. A 47. B 48. B 49. B 50. D Page 1