CCHAMBERLAIN COLLEGE OF NURSING CHEM 120 WEEK 8 FINAL EXAM QUESTIONS ANSWERS VERSION 2 ALREADY GRADED A

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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 volu... me, 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) 5. (TCO 1) Recently, you’ve noticed that your 10-year-old vacuum cleaner is not picking up the animal fur from your carpet as it has in the past. You have decided to invest in a new vacuum cleaner. Before you make a decision on which model to purchase from manufacturer XYZ, your neighbors offer to let you use their vacuums to help you in your decision-making process. Neighbor A has a vacuum made by manufacturer XYZ and is 5 years old. Neighbor B has a vacuum made by manufacturer XYZ and is a new model that has just been released. Formulate a testable hypothesis (5 pts). Design an experiment to test your hypothesis, and include your controls (5 pts). Be specific in your experimental design. Predict the experimental results that would support your hypothesis (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 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) [Show More]

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