Practice Final
Supplemental Instruction
IowaStateUniversity / Leader: / Sara
Course: / Chem 177A
Instructor: / Burke
Date: / 5/7
  1. Which of the following is not a chemical change?
  2. Dissolving NaCl in water
  3. Boiling liquid water into vapor water
  4. Combustion of CH4
  5. Neutalization of NaOH and HCl
  6. Hydrolysis of Na2O to get NaOH
  7. ( 8.24 + 3.9 ) x 19.59 =
  8. 200
  9. 240
  10. 237
  11. 237.2
  12. 237.22
  13. Which of the following is Hypobromous acid?
  14. HBr
  15. HBrO
  16. HBrO2
  17. HBrO3
  18. HBrO4
  19. If you have 123.45 mg Sulfuic Acid (mm=98.1g/mol), how many atoms of hydrogen are there?
  20. .00126
  21. .00252
  22. 7.58*1020
  23. 1.52*1021
  24. 7.44*1025
  25. If 3.0 moles or sodium react with excess phosphoric acid, and 2.34 grams hydrogen gas is formed, what it the percent yield?

6Na(s) + 2H3PO4(aq)  2Na3PO4 (aq) + 3H2(g)

  1. 13 %
  2. 56%
  3. 78%
  4. 81%
  5. 100%
  1. What coefficients are needed to balance the following reaction?

___CH3OH + ___O2 ___CO2 + ___H2O

  1. 1,2,1,2
  2. 2,4,2,3
  3. 2,3,2,4
  4. 1,3,2,4
  5. 4,6,4,8
  1. Which of the following is a correct chemical equation
  2. HF(aq) H+ (aq) + F- (aq)
  3. HClO3(aq)  H+ (aq) + ClO3- (aq)
  4. HNO3 (aq)  H+ (aq) + NO3- (aq)
  5. HBr (aq)  H+ (aq) + Br- (aq)
  6. For 107Ag2- how many protons neutrons and electrons are there respectively?
  7. 47, 47, 49
  8. 47, 50, 47
  9. 107, 60, 47
  10. 107, 47, 60
  11. 47, 60, 49
  12. If the molecular formula of a compound is C8H4O6Cl2, what is the molar mass of the empirical compound
  13. 98.7
  14. 133.5
  15. 155.5
  16. 200.1
  17. 266.9
  18. Which of the following metals in their solid form will react in a displacement reaction with and aqueous solution of Mg(NO3)2?
  19. Zn
  20. Al
  21. Ba
  22. Ag
  23. Sn
  24. What is the ∆Hfor, of Al2O3(s)?

4Al(s) + 6O2 (g)  2Al2O3 (s) ∆H= -456kJ

  1. 114 kJ
  2. 228 kJ
  3. 256 kJ
  4. -256 kJ
  5. -228 kJ
  1. In which of the following molecules does sulfur have the lowest oxidation state?
  2. H2S
  3. SO
  4. H2SO4
  5. H4S
  6. For the reaction in the equation in question 11, is it exothermic or endothermic, which means heat is ______from the system?
  7. Endothermic, released
  8. Endothermic, absorbed
  9. Exothermic, released
  10. Exothermic,absorbed
  11. How many p orbitals are there in a xenon atom?
  12. 12
  13. 4
  14. 24
  15. 8
  16. Which 2 elements/ions have the same electron configuration?
  17. As3-, Br1-
  18. P+,Si-
  19. Mg2+, S-
  20. K+, I-
  21. Mg2+,N2-
  1. What are the spectator ions in the reaction NH4NO3 (aq) and BaCO3 (aq)
  2. NH4+ and CO32-
  3. Ba2+ and NO3-
  4. NH4+and NO3-
  5. Ba2+ and CO32-
  6. Both answer a and b
  7. What is the concentration of a solution made from 15mL of 2.0M HBrO, 20.0 mL of H2O, and 9.7 g HBrO (mm=97 g/mol) assume volumes are additive?
  8. 3.7 M
  9. 2.3 M
  10. 1.8 M
  11. 4.1 M
  12. 1.2 M
  13. If an atom’s in an excited state, the electrons moves from ___and energy is ___.
  14. n=2 to n=3, emitted
  15. n=3 to n=2, emitted
  16. n=2 to n=3, absorbed
  17. n=3 to n=2, absorbed
  18. If you add 50. mL of water to 40. mL of 3.6 M NaCH3 what is the concentration?
  19. 2.9
  20. 1.7
  21. 1.60
  22. 2.90
  23. 1.6
  24. If you have 6.00 moles of aluminum (mm=27.0g/mol) at 25oC, and you add 157J of heat, what is the final temperature? (Cs=.900 Jg-1K-1)
  25. -4.07oC
  26. 54.1oC
  27. 23.9oC
  28. 26.1oC
  29. What are the units of the heat capacity of a bomb calorimeter and the molar heat capacity respectively?
  30. kJ,kJ/mol
  31. kJ/K, kJ/mol
  32. kJ/K, kJ/(mol*K)
  33. kJ/(K*g), kJ/K
  34. What is the energy of radiowaves broadcasting at 840 AM? (AM broadcasts in kHz)
  35. 5.57 x 10-28 J
  36. 2.78 x 10-28 J
  37. 3.45 x 10-28 J
  38. 4.86 x 10-28 J
  39. Which of the following is not a correct electron configuration?
  40. 1s22s22p63s23p64s23d104p3
  41. 1s22s22p63s23p63d5
  42. [Ar]4s2
  43. 1s22s22p63s23p84s2
  44. Electronegativity increases as you move ______.
  45. Down a group and from left to right
  46. Down a group and from right to left
  47. Up a group and from left to right
  48. Up a group and from right to left

For the next 2 questions use the molecules BrH41-

  1. There are ____ bonding pair(s) of electrons and _____ lone pair(s) on the molecule?
  2. 3,1
  3. 3,2
  4. 3,3
  5. 4,1
  6. 4,2
  7. What are the bond angles of the molecule?
  8. 90o
  9. 107o
  10. 109.5o
  11. 120o
  12. 180o
  13. Which of the following bonds are the most polar?
  14. F-O
  15. F-Cl
  16. F-S
  17. F-P
  18. S-Cl
  19. Calculate enthalpy change for the reaction in units of kJ;

CH3-CH3 + 4OH  4H2O + HC=CH

Bond / C-C / C=C / C-H / H-O
Bond energykJ/mol / 248 / 839 / 413 / 312
  1. +187 kJ
  2. -187 kJ
  3. -435 kJ
  4. 435 kJ
  1. Which of the following atoms can support an expanded octet
  2. H
  3. C
  4. O
  5. F
  6. Cl
  7. If a molecule has 4 bonding electron domains and 1 non-bonding electron pair, what is the molecular geometry?
  8. Bipyrimidal
  9. See-Saw
  10. Triganol pyramidal
  11. Octahedral
  12. Which of the following are correct resonance structures for ozone?
  1. I
  2. II
  3. I and III
  4. II and IV
  5. IV
  1. Which of the following molecules has the highest melting point?
  2. CF4
  3. H2CO
  4. H2COH
  5. HCCH
  6. What is the density of H2that is at STP?
  7. .089 g/L
  8. .11 g/L
  9. .082 g/L
  10. .98 g/L
  11. If you start with 65L of gas at 25oC and raise it to 55oC, while keeping it at atmospheric pressure what is the final Volume?
  12. 59 L
  13. 65L
  14. 71 L
  15. 77 L
  16. 83 L
  17. When heating water from 5oC to 105oC, what must you use to calculate q? (check all that apply)
  18. ∆Hvap
  19. ∆Hfus
  20. Cs(g)
  21. Cs(s)
  22. Cs(l)
  23. At which point are all 3 phases present?
  24. A
  25. B
  26. C
  27. D
  28. E
  29. What IMF are present in a propanol molecule?

I)London Dispersion

II)Dipole-Dipole

III)Hydrogen Bonding

  1. Only I
  2. Only II
  3. Only III
  4. I and III
  5. I and II
  1. In the following equation if you add moreSO3(g) equilibrium will shift ______and if you decrease the volume equilibrium will shift ______?

2SO2(g) + O2(g)  2SO3(g)

  1. Right, Left
  2. Left, Right
  3. Right, Right
  4. Left, Left