chem packet

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timer Asked: Dec 14th, 2017
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please solve these questions and show work. This packet contains problems related to molecular chemistry and requires you to show your work with correct answer.

WS 25, 26, 27 Final Spring 2017 Name:____________________________________ p. 1 1. (10 pts.) Perform the following operations. Report your results to the proper number of significant figures. Assume all numbers are measured quantities. a. 35.55  2.31 23.5  20.8 b. 3.62  105  4.3  104 4.583  1023 2. (10 pts) Calculate volume of 1.23 kg of oil with density of 923 mg/cm3. a. Express volume in L. b. Express volume in quarts. WS 25, 26, 27 Final Spring 2017 Name:____________________________________ p. 2 3. Based on the information given in the following equations, classify each of the pure substances A through G as elements or compounds, or indicate that no such classification is possible. a. A + 2B  C + D b. E + F  2G 4. (10 pts) Complete the following table: (Assume all atoms are neutral) Name of Element Nuclear Symbol Atomic Number Mass Number Number of Protons Number of Neutrons Number of Electrons 133 55 Cs 47 60 84 36 WS 25, 26, 27 Final Spring 2017 Name:____________________________________ p. 3 5. (10 pts) Deduce chemical symbol from the condensed electron configurations for the following neutral elements. a. [Ar]4s23d8 b. [Ne]3s23p5 6. (10 pts.) a. Write Lewis structure for H2CO b. Predict molecular geometry c. Is it polar or non-polar molecule? WS 25, 26, 27 Final Spring 2017 Name:____________________________________ 7. (10 pts) Complete the table Formula Name H2PO4− NaH AgNO3 sulfuric acid carbonate ion p. 4 WS 25, 26, 27 Final Spring 2017 Name:____________________________________ p. 5 8. (10 pts) Express the amount of chemical substance in different units. a. 4.5 g of K2CO3 in units of moles. b. 3.45 g of RbCl as number of molecules. c. 2.34×1024 molecules of NaCl in units of grams. 9. (10 pts) Balance the following reaction and determine how many grams of PCl5 are needed to produce 5.67 g of HCl. PCl5 + H2O  H3PO4 + HCl WS 25, 26, 27 Final Spring 2017 Name:____________________________________ p. 6 10. (10 pts.) Calculate the heat needed to convert 2.3 g of propyl alcohol from a gaseous state at 400. K into the liquid at 310. K. The normal melting and boiling points of this substance are -127 oC and 97 oC, respectively. The heat of fusion is 86.2 J/g and the heat of vaporization is 694 J/g. The specific heats of the solid, liquid and gaseous states are 2.36, 2.83, and 1.76 J/(g·oC), respectively. 11. (10 Pts.) How many liters of CO2 at STP can be produced from 45.2 L of CO gas at 2.3 atm and 41 o C, and 23.0 L of O2 gas at 2.56 atm and 23 oC according to the following reaction: 2CO (g) + O2(g) --> 2CO2(g) WS 25, 26, 27 Final Spring 2017 Name:____________________________________ p. 7 12. (10 pts.) Calculate the molarity of 2.34 L of aqueous solution that contains 4.56 g of KBr.? 13. (10 Pts.) An aqueous solution of acetic acid (HC2H3O2) is 0.796 M and has density of 1.004 g/mL. What is the molality of the solution? WS 25, 26, 27 Final Spring 2017 Name:____________________________________ 14. (10 pts.) Give the chemical formula for the following: a) conjugate acid for H2O b) conjugate base for H2O 15. (10 Pts.) Determine the concentration of H3O+ and OH− ions for H2SO4 aqueous solution of pH = 2.3. Determine the molarity of the H2SO4 solution. p. 8 WS 25, 26, 27 Final Spring 2017 Name:____________________________________ p. 9 16. (10 Pts.) Write balanced reaction of aqueous solutions of barium chloride and potassium sulfate. Write the ionic and net ionic equations. Mind that barium sulfate is insoluble. 17. (10 Pts.) Determine oxidation numbers of each element in the following compounds. a. H2S2O7 b. PO43- WS 25, 26, 27 Final Spring 2017 Name:____________________________________ p. 10 18. (20 Pts.) Balance the following redox reaction in acidic solution using a method of your choice MnO4- (aq) + Fe2+(aq)  Fe3+(aq) + Mn2+(aq) WS 25, 26, 27 Final Spring 2017 Name:____________________________________ Useful equations and constants: 1 cal = 4.184 J, 1 inch = 2.54 cm, 1 US fl oz = 29.57 mL, 1 lb = 453.6 g 1 atm = 760 mm Hg, 0 oC = 273.15 K, R = 0.08206 atm·L/(mole·K), P·V = n·R·T, NA = 6.022 1023 units/mole, KW = 1.00×10-14 Electronegativity Table p. 11

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School: Purdue University

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