CHEM 120 Week 8 Final Exam (Solved Q & A)
Page 1
1. Question: (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):
2. Question: (TCO 1) How
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CHEM 120 Week 8 Final Exam (Solved Q & A)
Page 1
1. Question: (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):
2. Question: (TCO 1) How many mL are in 3.5 pints? Show your work.
3. Question: (TCO 3) What is the name of the following compound: Zn3P2?
4. Question: (TCO 3) What is the name of the following compound: AgNO3?
5. Question: (TCO 6) Calculate the pressure, in atmospheres, of 2.78 mol CO(g) in a 4.25 L tank at 51 degrees C.
6. Question: (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.
7. Question: (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.
8. Question: (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?
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1. Question: (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.
2. Question: (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.
3. Question: (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 , mass number , and atomic number .
4. Question: (TCO 13) What is the mRNA sequence for the following segment of DNA: –AAACGTGTGCTAACA– ? Based upon the mRNA sequence, what is the peptide sequence ?
5. Question: (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.
6. Question: (TCO 13) What is the mRNA sequence for the following segment of DNA: –CTCGTGGTTTCATCC– ? Based upon the mRNA sequence, what is the peptide sequence ?
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1. Question: (TCO 12) Transcription is the process by which DNA passes information to
2. Question: (TCO 12) The portion of an enzyme where the substrate “fits” during the reaction is called the
3. Question: (TCO 12) Which of the following is not an unsaturated fatty acid?
4. Question: (TCO 12) The helical structure of certain proteins, such as wool, is a part of the protein’s
5. Question: (TCO 12) Which of the following is a disaccharide?
6. Question: (TCO 12) In cells, protein synthesis occurs on the
7. Question: (TCO 12) Which of the following is a monosaccharide?
8. Question: (TCO 4) The best description of the shape of an ammonia molecule is _____.
9. Question: (TCO 4) Which of the following substances does not have polar covalent bonds?
10. Question: (TCO 8) According to the Bronsted-Lowry definition, which chemical in the following reaction is the acid?
11. Question: (TCO 8) According to the Bronsted-Lowry definition, which chemical in the following reaction is the base?
12. Question: (TCO 2) Match the atom with the appropriate description.
13. Question: (TCO 10) Match the organic compound with its use or characteristic.
14. Question: (TCO 9) Match the organic compound with its name.
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Page 2
1. Question: (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):
2. Question: (TCO 1) How many meters are in 175 inches? Show your work.
3. Question: (TCO 3) What is the name of the following compound: Na2S?
4. Question: (TCO 3) What is the name of the following compound: AgNO3?
5. Question: (TCO 6) Calculate the volume, in liters, of a 4.12 mol H2S(g) at 60 degrees C and 1.75 atm.
6. Question: (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.
7. Question: (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.
8. Question: (TCO 12) If one strand of a DNA double helix has the sequence ACGTCATGGC, what is the sequence of the other DNA strand?
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Page 3
1. Question: (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.
2. Question: (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.
3. Question: (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.
4. Question: (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 , mass number , and atomic number .
5. Question: (TCO 13) What is the mRNA sequence for the following segment of DNA:
–TAACGAATAGCCTGT– ? Based upon the mRNA sequence, what is the peptide sequence ?
6. Question: (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.
7. Question: (TCO 13) What is the mRNA sequence for the following segment of DNA:
–CTCGTGGTTTCATCC– ? Based upon the mRNA sequence, what is the peptide sequence ?
________________________________________
Page 4
1. Question: (TCO 12) The DNA double helix is _____.
2. Question: (TCO 12) Which of the following best describes the action of enzymes in living systems? A specific enzyme generally catalyzes
3. Question: (TCO 12) Which of the following is not an unsaturated fatty acid?
4. Question: (TCO 12) The primary structure of a protein is determined by
5. Question: (TCO 12) Which of the following is a disaccharide?
6. Question: (TCO 12) Cell nutrients and waste must pass through the
7. Question: (TCO 12) Which of the following is a monosaccharide?
8. Question: (TCO 4) The best description of the shape of an ammonia molecule is _____.
9. Question: (TCO 4) Which of the following substances does not have polar covalent bonds?
10. Question: (TCO 8) According to the Bronsted-Lowry definition, which chemical in the following reaction is the acid?
11. Question: (TCO 8) According to the Bronsted-Lowry definition, which chemical in the following reaction is the base?
12. Question: (TCO 2) Match the atom with the appropriate description.
13. Question: (TCO 10) Match the organic compound with its use or characteristic.
14. Question: (TCO 9) Match the organic compound with its name.
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