CHEM 120 Week 8 Final Exam A+ GRADED

CHEM 120 Week 8 Final Exam A+ GRADED 6. (TCO 6) A gas at a temperature of 95 degrees C occupies a volume of 165 mL. Assuming constant pressure, determine the volume at 25 degrees C. Show your work. (Points : 5) Using Charles’ Law, (V1/T1) = (V2/T2). First, convert temperature to KELVIN (T1 = t1 +273) Thus, T1 = 95 + 273 = 368. We have V1 (165 mL) & T2 = (25 + 273) = 298. V2 = (V1*T2)/T1 = (165 mL*298)/368 = 133.6 mL. 7. (TCO 6) A sample of helium gas occupies 1021 mL at 719 mmHg. For a gas sample at constant temperature, determine the volume of helium at 745 mmHg. Show your work. (Points : 5) 1021mL * 719 mm/745 mmHg = 985.36mL =985mL Using Boyle’s law, P1V1 = P2V2. We have V1 (1021 mL), P1 (719 mmHg) and P2 (745 mmHg). 8. (TCO 12) If one strand of a DNA double helix has the sequence T T A G C G A C G C, what is the sequence of the other DNA strand? (Points : 10) A A T C G C T G C G 1. (TCO 8) 35.0 mL of 0.25 M NaOH is neutralized by 23.6 mL of an HCl solution. The molarity of the HCl solution is (show your work): (Points : 5) 2. (TCO 1) How many mL are in 3.5 pints? Show your work. (Points : 5) 3. (TCO 3) What is the name of the following compound: Zn3P2? (Points : 5) 4. (TCO 3) What is the name of the following compound: AgNO3? (Points : 5) 5. (TCO 6) Calculate the pressure, in atmospheres, of 2.78 mol CO(g) in a 4.25 L tank at 51 degrees C. (Points : 5) 1. (TCO 7) (a, 5 pts) Given that the molar mass of H3PO4 is 97.994 grams, determine the number of grams of H3PO4 needed to prepare 0.75L of a 0.25M H3PO4 solution. Show your work. (b, 5 pts) What volume, in Liters, of a 0.25 M H3PO4 solution can be prepared by diluting 50 mL of a 2.5M H3PO4 solution? Show your work. (Points : 10) 2. (TCO 7) (a, 5 pts) What is the volume percent of a solution prepared by dissolving 21 g of NaOH in enough water to make a final volume of 120 mL? Show your work. (b, 5 pts) How many mL of a 10% solution can be made from the solution in part a? Show your work. (Points : 10) 4. (TCO 11) Tungsten (W), with a mass number of 180 and an atomic number of 74, decays by emission of an alpha particle. Identify the product of the nuclear reaction by providing its atomic symbol (5 pts), mass number (5 pts), and atomic number (5 pts). (Points : 15) 6. (TCO 13) What is the mRNA sequence for the following segment of DNA: --AAACGTGTGCTAACA-- (10 pts)? Based upon the mRNA sequence, what is the peptide sequence (10 pts)? (Points : 20) 7. (TCO 5) Given the following unbalanced chemical equation: Al + Cl2-> AlCl3 (a, 5 pts) Balance the equation. (b, 5 pts) How many moles of AlCl3 are produced from 1.75 mole of Cl2? Show your work. (c, 5 pts) What is the molar mass of AlCl3? Show your work. (d, 5 pts) Calculate the number of grams of AlCl3 produced from 1.75 mol Cl2. Show your work. (Points : 20) 8. (TCO 13) What is the mRNA sequence for the following segment of DNA: --CTCGTGGTTTCATCC-- (10 pts)? Based upon the mRNA sequence, what is the peptide sequence (10 pts)? (Points : 20) 1. (TCO 12) Transcription is the process by which DNA passes information to (Points : 5) another strand of DNA. transfer RNA. ribosomal RNA. messenger RNA. a new cell. 2. (TCO 12) The portion of an enzyme where the substrate “fits” during the reaction is called the (Points : 5) active site. action site. reaction site. substrate site. inhibitor site. 3. (TCO 12) Which of the following is not an unsaturated fatty acid? (Points : 5) CH3CH2CH2CH=CHCOOH CH3CH=CHCH=CHCOOH CH3CH2CH2CH2CH2COOH CH3CH2CH2CH2CH2CH=CHCOOH CH3CH=CHCH2CH=CHCOOH 4. (TCO 12) The helical structure of certain proteins, such as wool, is a part of the protein’s (Points : 5) primary structure. secondary structure. tertiary structure. primary and secondary structures. secondary and tertiary structures. 5. (TCO 12) Which of the following is a disaccharide? (Points : 5) Cellulose Starch Fructose Galactose Lactose 6. (TCO 12) In cells, protein synthesis occurs on the (Points : 5) Golgi apparatus. mitochondria. nucleus. cytoplasm. ribosomes. 7. (TCO 12) Which of the following is a monosaccharide? (Points : 5) Cellulose Starch Galactose Mannose Lactose 8. (TCO 4) The best description of the shape of an ammonia molecule is _____. (Points : 5) linear pyramidal bent tetrahedral None of the above 9. (TCO 4) Which of the following substances does not have polar covalent bonds? (Points : 5) CO2 Br2 CH4 NF3 10. (TCO 8) According to the Bronsted-Lowry definition, which chemical in the following reaction is the acid? H2CO3 + H2O -> H3O+ + HCO3- (Points : 5) H2O HCO3- H2CO3 H3O+ None of the above 11. (TCO 8) According to the Bronsted-Lowry definition, which chemical in the following reaction is the base? H2CO3 + H2O -> H3O+ + HCO3- (Points : 5) H2O H2CO3 HCO3- H3O+ None of the above 12. (TCO 2) Match the atom with the appropriate description. (Points : 15) Potential Matches: 1 : Boron (B) 2 : Carbon (C) 3 : Neon (Ne) 4 : Nitrogen (N) 5 : Lithium (Li) Answer : An atom, which has a mass number of 7, with 4 neutrons : An atom, which has a mass number of 11, with 6 neutrons : An atom, which has a mass number of 12, with 6 neutrons : An atom, which has a mass number of 14, with 7 neutrons : An atom, which has a mass number of 20, with 10 neutrons 13. (TCO 10) Match the organic compound with its use or characteristic. (Points : 15) Potential Matches: 1 : Disinfectant 2 : Fingernail polish remover 3 : Alkaloid 4 : Insecticide 5 : Pineapple flavor Answer : Dichlorodiphenyltrichloroethane : Formaldehyde : Acetone : Caffeine : Ethyl butyrate 14. (TCO 9) Match the organic compound with its name. (Points : 15) Potential Matches: 1 : Ethanoic acid 2 : 1-propanol 3 : Ethylamine 4 : Heptanal 5 : Pentyl acetate Answer : CH3COOH : CH3CH2CH2CH2CH2CH2CHO : CH3CH2CH2OH : CH3COOCH2CH2CH2CH2CH3 : CH3CH2NH2 Week 8 : Final Exam - Final Exam CHEM120 Final Exam Page 3 1. (TCO 7) (a, 5 pts) Given that the molar mass of H3PO4 is 97.994 grams, determine the number of grams of H3PO4 needed to prepare 0.25L of a 0.2M H3PO4 solution. Show your work. (b, 5 pts) What volume, in Liters, of a 0.2 M H3PO4 solution can be prepared by diluting 50 mL of a 5M H3PO4 solution? Show your work. (Points : 10) 2. (TCO 7) (a, 5 pts) What is the mass/volume percent of a solution prepared by dissolving 43 g of NaOH in enough water to make a final volume of 120 mL? Show your work. (b, 5 pts) How many mL of a 10% solution can be made from the solution in part a? Show your work. (Points : 10) 3. (TCO 12) Polyethylene is a polymer found in many applications, including packaging for fruit and vegetables. Discuss the structural differences between (1) polyethylene, (2) polypropylene, and (3) polystyrene and how the structure impacts their commercial uses. (Points : 15) 4. (TCO 11) Tungsten (W), with a mass number of 180 and an atomic number of 74, decays by emission of an alpha particle. Identify the product of the nuclear reaction by providing its atomic symbol (5 pts), mass number (5 pts), and atomic number (5 pts). (Points : 15) 6. (TCO 13) What is the mRNA sequence for the following segment of DNA: --TAACGAATAGCCTGT-- (10 pts)? Based upon the mRNA sequence, what is the peptide sequence (10 pts)? (Points : 20) 7. (TCO 5) Given the following unbalanced chemical equation: Al + Cl2-> AlCl3 (a, 5 pts) Balance the equation. (b, 5 pts) How many moles of AlCl3 are produced from 1.75 mole of Cl2? Show your work. (c, 5 pts) What is the molar mass of AlCl3? Show your work. (d, 5 pts) Calculate the number of grams of AlCl3 produced from 1.75 mol Cl2. Show your work. (Points : 20) 8. (TCO 13) What is the mRNA sequence for the following segment of DNA: --CTCGTGGTTTCATCC-- (10 pts)? Based upon the mRNA sequence, what is the peptide sequence (10 pts)? (Points : 20) Week 8 : Final Exam - Final Exam CHEM120 Final Exam Page 2 1. (TCO 8) 45.0 mL of 0.75 M NaOH is neutralized by 53.6 mL of an HCl solution. The molarity of the HCl solution is (show your work): (Points : 5) 2. (TCO 1) How many meters are in 175 inches? Show your work. (Points : 5) 3. (TCO 3) What is the name of the following compound: Na2S? (Points : 5) 4. (TCO 3) What is the name of the following compound: AgNO3? (Points : 5) 5. (TCO 6) Calculate the volume, in liters, of a 4.12 mol H2S(g) at 60 degrees C and 1.75 atm. (Points : 5) 6. (TCO 6) A gas at a temperature of 185 degrees C occupies a volume of 575 mL. Assuming constant pressure, determine the volume at 15 degrees C. Show your work. (Points : 5) 7. (TCO 6) A sample of helium gas occupies 1045 mL at 721 mmHg. For a gas sample at constant temperature, determine the volume of helium at 745 mmHg. Show your work. (Points : 5) 8. (TCO 12) If one strand of a DNA double helix has the sequence ACGTCATGGC, what is the sequence of the other DNA strand? (Points : 10) 1. (TCO 12) The DNA double helix is _____. (Points : 5) made up of two polynucleotide strands composed of adenine and thymine a puzzle to geneticists composed of adenine and guanine composed of two chromosomes 2. (TCO 12) Which of the following best describes the action of enzymes in living systems? A specific enzyme generally catalyzes (Points : 5) one specific reaction. a group of similar reactions. many different reactions. either one specific reaction or a group of similar reactions. random reactions. 3. (TCO 12) Which of the following is not an unsaturated fatty acid? (Points : 5) CH3CH2CH2CH=CHCOOH CH3CH=CHCH=CHCOOH CH3CH2CH2CH2CH2COOH CH3CH2CH2CH2CH2CH=CHCOOH CH3CH=CHCH2CH=CHCOOH 4. (TCO 12) The primary structure of a protein is determined by (Points : 5) the amino-acid composition. the order of amino acids in the protein. the hydrogen bonding that gives the protein a three-dimensional shape. the intertwining of protein molecules to form a “functional” protein. the hydrogen bonds between sulfur atoms on different amino acids. 5. (TCO 12) Which of the following is a disaccharide? (Points : 5) Cellulose Starch Ribose Galactose Lactose 6. (TCO 12) Cell nutrients and waste must pass through the (Points : 5) nuclear membrane. ribosomes. mitochondria chloroplasts. cell membrane. 7. (TCO 12) Which of the following is a monosaccharide? (Points : 5) Mannose Starch Cellulose Glucose Lactose 8. (TCO 4) The best description of the shape of an ammonia molecule is _____. (Points : 5) linear pyramidal bent tetrahedral None of the above 9. (TCO 4) Which of the following substances does not have polar covalent bonds? (Points : 5) CO2 Br2 CH4 NF3 10. (TCO 8) According to the Bronsted-Lowry definition, which chemical in the following reaction is the acid? NH4+ + H2O -> H3O+ + NH3 (Points : 5) H3O+ NH4+ NH3 H2O None of the above 11. (TCO 8) According to the Bronsted-Lowry definition, which chemical in the following reaction is the base? HCN + NO2- -> CN- + HNO2 (Points : 5) HNO2 NO2- HCN CN- None of the above 12. (TCO 2) Match the atom with the appropriate description. (Points : 15) Potential Matches: 1 : Nitrogen (N) 2 : Carbon (C) 3 : Boron (B) 4 : Fluorine (F) 5 : Beryllium (Be) Answer : An atom, which has a mass number of 9, with 5 neutrons : An atom, which has a mass number of 11, with 6 neutrons : An atom, which has a mass number of 12, with 6 neutrons : An atom, which has a mass number of 19, with 10 neutrons : An atom, which has a mass number of 14, with 7 neutrons 13. (TCO 10) Match the organic compound with its use or characteristic. (Points : 15) Potential Matches: 1 : Component of ant sting 2 : Found in antifreeze 3 : Orange flavor 4 : Propellants 5 : Fishy odor Answer : Octyl acetate : CFCs : Formic acid : Ethylene glycol : Trimethylamine 14. (TCO 9) Match the organic compound with its name. (Points : 15) Potential Matches: 1 : Ethanoic acid 2 : 1-propanol 3 : Ethylamine 4 : Heptanal 5 : Pentyl acetate Answer : CH3COOH : CH3CH2CH2CH2CH2CH2CHO : CH3CH2CH2OH : CH3COOCH2CH2CH2CH2CH3 : CH3CH2NH2