CHEMISTRY 101 SPRING 2007 FI NAL FORM B SECTIONS DR. KEENEY-KENNICUTT

Size: px

Start display at page:

Download "CHEMISTRY 101 SPRING 2007 FI NAL FORM B SECTIONS DR. KEENEY-KENNICUTT"

Bryce Lloyd
5 years ago
Views:

1 NAME (Please print ) AM or PM CHEMISTRY 101 SPRING 2007 FI NAL FORM B SECTIONS DR. KEENEY-KENNICUTT Directions: (1) Put your name (neatly) and signature on both parts of the exam where indicated. (2) Each multiple choice question is actually 2 questions on your scanning sheet. If you are sure of an answer, put the same answer down for both questions for 5 pts. If you cannot decide between two answers, put one answer down for one question and the other answer down for the other question. If you get one correct you'll get half credit for 2.5 pts. If there is an ambiguous multiple choice question, use the last page to explain your answer. (3) Do NOT write on the envelope. (4) When finished, put both parts of the exam in the envelope with the scanning sheet. You can leave during announced times. You can pick up your multiple choice and answers outside my office after the exam. (5) There are a total of 56 questions (30 actual questions + 2 assessment questions) - total value is 160 points plus 5pts each for assessments = 170 pts. PART 1 1&2. Which one of the following statements about this phase diagram is FALSE? (a) At Point 2, the solid phase is in equilibrium with gas phase. (b) Point 1 is called the triple point. (c) At STP, the substance is a liquid. (d) At Point 4, the liquid phase is in equilibrium with the solid phase. (e) When the conditions change from Point 5 to Point 3, the temperature stays constant and the pressure changes. 3&4. The total number of fundamental particles (protons, neutrons, and electrons) in an atom of 23 Na is: (a) 11 (b) 12 (c) 23 (d) 34 (e) 46 5&6. Which statement is WRONG? (a) The atomic weight for fluorine is about 19. (b) An atom of germanium is smaller than an atom of bromine. (c) The most stable sodium ion is Na +. (d) The atomic radius of strontium is larger than the ionic radius of Sr 2+. (e) The first ionization energy for sodium is greater than the first ionization energy for potassium. Keeney-Kennicutt, 2007 B1

2 7&8. Which of the following bonds would you expect to be the most polar? (a) N-H (b) H-S (c) S-O (d) S-S (e) S-Cl 9&10. Which of the following statements is FALSE regarding gases? (a) The average kinetic energies of molecules of different kinds of gases are the same at a given temperature. (b) Under ordinary conditions of temperature and pressure, gas molecules are widely separated. (c) The gas, HF, behaves more ideally at 0.1 atm than it does at 10 atm. (d) Gas molecules move in rapid, random, straight-line paths until collision occurs with other molecules or with the walls of the container. (e) Carbon dioxide gas behaves more ideally at 200K than it does at 500K. 11&12. Which compound cannot exhibit London forces? (a) CaS (b) HCl (c) C 2 H 2 (d) CH 4 (e) OF 2 13&14. Which one of the following is an insoluble base? (a) NH 3 (b) CsOH (c) (CH 3 ) 2 NH (d) Mg(OH) 2 (e) Ba(OH) 2 15&16. The element in Group 2A and the fourth period is: (a) Mg (b) Ca (c) Sc (d) Ga (e) C Keeney-Kennicutt, 2007 B2

3 17&18. The compound BaCl 2 forms hard clear crystals that don't conduct electricity. When the crystals melt at 963 o C, the resulting liquid does conduct electricity. The type of solid formed by BaCl 2 is probably classified as. (a) molecular (b) metallic (c) polar (d) ionic (e) covalent 19&20. If the ph of a solution is 5 at 25 o C, the solution is: (a) strongly acidic (b) weakly acidic (c) neutral (d) weakly basic (e) strongly basic 21&22. Consider this process: H 2 O (s) H 2 O( ) (a) This is the process of freezing and it is exothermic. (b) This is the process of melting and it is exothermic. (c) This is the process of freezing and it is endothermic. (d) This is the process of melting and it is endothermic. (e) This is the process of freezing and no heat is involved. 23&24. The compound H-C C-C C-H, has sigma bonds and pi bonds. (a) 3,4 (b) 3,2 (c) 5,4 (d) 5,3 (e) another combination 25&26. Select the correct IUPAC name for: (a) 1,1-dimethyl-3-ethylhexane (b) 4-ethyl-2-methylheptane (c) 2-methyl-4-propylhexane (d) 4-ethyl-6-methylheptane (e) 3-propyl-4-methylpentane Keeney-Kennicutt, 2007 B3

4 27&28. Calculate the number of CH 3 COOH molecules in 7.5 g of CH 3 COOH. (a) 3.3 x (b) 3.0 x (c) 7.9 x (d) 9.4 x (e) 7.5 x &30. What organic group is NOT present on this organic molecule? (a) ester (b) benzene ring (c) aldehyde (d) phenol (e) ether 31&32. The imaginary element X (AW = amu) has the following isotopic masses: 79 X amu 83 X amu What is the percent abundance of 83 X? (a) 74.5% (b) 24.6% (c) 50.0% (d) 62.8% (e) 37.5% Keeney-Kennicutt, 2007 B4

5 33&34. Consider this reaction: 2 H 2 + O 2 2 H 2 O. If you had 4 moles of H 2 and 4 moles of O 2, which picture would represent the final situation? Let = H and = O (a) (b) (c) (d) (e) 35&36. An unknown organic compound composed of carbon, hydrogen and oxygen was analyzed and found to be 60.02% carbon, 8.00% hydrogen, and 31.98% oxygen by weight. Which of the following represents the correct empirical formula for the compound? (a) C 5 H 8 O 2 (b) C 5 H 7 O (c) C 5 H 6 O (d) C 4 H 6 O 2 (e) C 4 H 5 O Keeney-Kennicutt, 2007 B5

6 37&38. In a particular process, 15.4 g of bromobenzene (C 6 H 5 Br) was fused with excess potassium hydroxide according to the balanced equation: C 6 H 5 Br + KOH C 6 H 5 OH + KBr If 6.15 g of phenol (C 6 H 5 OH) were obtained, the yield was approximately: (a) 42.3% (b) 66.6% (c) 82.2% (d) 91.4% (e) 96.7% 39&40. How many milliliters of M AgNO 3 are needed to react with 10.0 g of Cu, according to the following unbalanced equation? AgNO 3 + Cu Cu(NO 3 ) 2 + Ag (UNBALANCED) (a) 755 ml (b) 427 ml (c) 567 ml (d) 311 ml (e) 629 ml Keeney-Kennicutt, 2007 B6

7 41&42. The microorganisms causing "gas gangrene" produce the gas by fermenting "muscle sugar": C 6 H 12 O 6 (s) 2C 2 H 5 OH( ) + 2CO 2 (g) in the presence of bacteria What would be the standard enthalpy change for the fermentation of 80.5 g of the sugar? Compound C 6 H 12 O 6 (s) C 2 H 5 OH( ) CO 2 (g) H o f (kj/mol) (a) 17 kj (b) 39 kj (c) +26 kj (d) 13 kj (e) +5.9 kj 43&44. Given: Water: m.p. 0 o C b.p. 100 o C Specific Heat (gas) = 2.03 J/g o C Heat of fusion = 333 J/g at 0 o C Heat of vap. = 2260 J/g at 100 o C Specific Heat (liquid) = 4.18 J/g o C Specific Heat (solid) = 2.09 J/g o C Calculate the amount of heat that must be removed to convert 136 g of water at 70.0 o C to ice at 0.0 o C (in kj) (a) 110 kj (b) 97 kj (c) 41 kj (d) 68 kj (e) 85 kj Keeney-Kennicutt, 2007 B7

8 45&46. What is the density of a sample of SO 2 gas at STP?. (a) 2.9 g/l (b) 0.71 g/l (c) 4.0 g/l (d) 1.4 g/l (e) 0.50 g/l 47&48. A 3.00 g sample of KClO 3 decomposes to yield oxygen at 25.0 o C and 735 torr. What volume of oxygen is collected? 2KClO 3 2KCl + 3O 2 (a) 928 ml (b) 746 ml (c) 621 ml (d) 422 ml (e) 155 ml 49. Take the paper questionnaire on our homework (5 pts) - see neo. 50. Take the on-line questionnaire on our course (5 pts) - see neo. Keeney-Kennicutt, 2007 B8

9 CHEMISTRY 101 FINAL Form B Sections Spring 2007 NAME PART 2 Please read and sign: On my honor, as an Aggie, I have neither given nor received unauthorized aid on this exam. (5 pts) 51. Determine the correct net ionic equation for the completely neutralized acid-base solution reaction occurring between hydrofluoric acid and barium hydroxide. The salt is insoluble. (6 pts) 52. Give the name or formula of the following: (a) calcium bromide (b) copper(ii) sulfate (c) SO 3 (4 pts) 53. What is the oxidation number of sulfur in the ion, SO 3 2?. (8 pts) 54. Consider the element, germanium, Ge. (a) Write out the full electron configuration for this element. (You can use the appropriate noble gas) (b) What is an appropriate set of 4 quantum numbers for the last electron assigned to this element? (c) Is the element diamagnetic or paramagnetic? If paramagnetic, how many unpaired electrons does it have? OVER Keeney-Kennicutt, 2007 B9

10 (12 pts) 55. Draw the correct dot structure for the following 2 species. Show all valence electrons. Fill in the appropriate information. H 2 Se SeF 3 (a) Dot structure: (a) Dot structure: (b) molecular (ionic) geometry: (b) molecular (ionic) geometry: (c) hybridization of central atom: (c) hybridization of central atom: (d) has a dipole moment (yes/no): (d) has a dipole moment (yes/no): (5 pts) 56. (a) What is the difference between evaporation and boiling? (2pts) (b) What is the approximate normal boiling point of Compound B? (1 pt) (c) Is the boiling point of water in a pressure cooker higher or lower than that at sea level. Explain. (2 pts) Compound B Keeney-Kennicutt, 2007 B10

11 SCRAP PAPER OR COMMENTS ON EXAM CHEMISTRY 101 FINAL Form B Fall 2007 S NAME Keeney-Kennicutt, 2007 B11

CHEMISTRY 101 SPRING 2010 FINAL FORM B DR. KEENEY-KENNICUTT PART 1

NAME (Please print ) CHEMISTRY 101 SPRING 2010 FINAL FORM B DR. KEENEY-KENNICUTT Directions: (1) Put your name on PART 1 and your name and signature on PART 2 of the exam where indicated. (2) Sign the