# 1. Which of the following substances does not have polar covalent bonds?

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None of the above 3. 15.0 mL of 0.45 M NaOH is neutralized by 13.7 mL of an HCl solution. What is the molarity of the HCl solution? (Show your work.)4. Calculate the volume, in liters, of a 4.12 mol H2S(g) at 60 degrees C and 1.75 atm. 5. 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.)6. (a) Given that the molar mass of H3PO4 is 97.994 grams, determine the number of grams of H3PO4 needed to prepare 0.45 L of a 0.3 M H3PO4 solution. Show your work. (5 points)(b) What volume, in liters, of a 0.3 M H3PO4 solution can be prepared by diluting 50 mL of a 4 M H3PO4 solution? Show your work. (5 points) (Points : 10)7. (a) What is the volume percentage of a solution prepared by dissolving 30 g of NaOH in enough water to make a final volume of 120 mL? Show your work. (5 points)(b) How many mL of a 10% solution can be made from the solution in part a? Show your work. (5 points) (Points : 10)8. Discuss how the structures of HDPEs, LDPEs, and LLDPEs contribute to their use (3 points each). Provide an example of a product produced by each product (2 points each). (5 points for each polymer type) (Points : 15)9. Platinum (Pt), with a mass number of 190 and an atomic number of 78, decays by emission of an alpha particle. Identify the product of the nuclear reaction by providing its atomic symbol (5 points), mass number (5 points), and atomic number (5 points). (Points : 15)10. You want to paint the family room with a paint that will be easy to wash, because you have young children and the family room is where they are often found. You want to test three different types of paints (A, B, and C) against the brand of paint currently on your walls based upon advertising claims. Neighbor A states that Brand A Paint performs according to advertising claims. Neighbor B states that Brand B Paint is easy to wash, and Neighbor B has children who are the same age as yours. Neighbor C states that Brand C Paint performs according to advertising claims, but Neighbor C does not have children. Formulate a testable hypothesis (5 points). Design an experiment to test your hypothesis, and include your controls (5 points). Be specific in your experimental design. Predict the experimental results that would support your hypothesis (5 points). (Points : 15)11. What is the mRNA sequence for the following segment of DNA? (10 points)–CAACGCTTAGGTAGA–Based upon the mRNA sequence, what is the peptide sequence (10 points)?12. Provide answers for (a)-(d) based the following unbalanced chemical equation.Al + Cl2-> AlCl3 (a) Balance the equation. (5 points)(b) How many moles of AlCl3 are produced from 0.75 mole of Cl2? Show your work. (5 points)(c) What is the molar mass of AlCl3? Show your work. (5 points)(d) Calculate the number of grams of AlCl3 produced from 0.75 mol Cl2. Show your work. (5 points) (Points : 20)13. What is the mRNA sequence for the following segment of DNA?–AAACTACCCAATAGG– (10 points)Based upon the mRNA sequence, what is the peptide sequence (10 points)?

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