Part 1: Multiple Choice (2 points each)Directions: Please circle the best answer for each of the following questions.11. Part 2: Short Answer12. Directions: Answer each of the following questions. Be sure to use complete sentences where appropriate. For full credit be sure to show all of your work.Grossmont College Chemistry 141 Exam 3 Fall 2015Name: ___________________________________Date: ________Instructor: Diana VanceExam 3Part 1: Multiple Choice (2 points each) Directions: Please circle the best answer for each of the following questions. 1. Which of the following photons has the highest energy?a. a photon from a Nd:YAG laser with  = 1,064 nmb. a photon from an Ar+ laser with  = 514.5 nmc. a photon from a Kr+ laser with  = 647 nmd. a photon from an ArF laser with  = 193 nme. a photon from a He–Ne laser with  = 633 nm2. Which of the transitions in the following hydrogen atomenergy-level diagram involves the shortest wavelengthphoton?a. ab. bc. cd. de. none of the abovePage 1 of 83. Which statement provides the best description of acovalent bond?a. The negative charge on one atom is attracted to the positive charge on a second atom.b. A high electron density between two positively charged atomic nuclei serves to attract the nuclei to eachother.c. Two or more electrons are attracted to each other, thereby holding the atoms together.d. Two atomic nuclei are attracted to each other by the strong nuclear force.e. Two atomic nuclei are attracted to each other by the Coulomb force.4. How many covalent bonds are there in the cyanide ion?a. 0b. 1c. 2d. 3e. 45. How many pi bonds are there in the cyanide ion? a. 0b. 1c. 2d. 3e. 46. Which of the following represents the best Lewisstructure for dinitrogen sulfide?a.b.c. .d.e.7. Which of the following molecules is paramagnetic?a. Li2b. C2c. B2d. N2e. F28. Which of the following compounds do you expect to bemost soluble in water?a. CO2b. CCl4c. O2d. SiO2e. NH39. Which of the following factors influence the vaporpressure of a pure liquid? a. The volume of liquid present in a container.b. The temperature of liquid present in a container. c. The surface area of the liquid. d. b and ce. all of the above 10. Which experiment used a balance? a. Analysis of an Antacidb. Alloy Analysisc. Standard Deviation d. Calorimetrye. all of the above11. Part 2: Short Answer 12. Directions: Answer each of the following questions. Besure to use complete sentences where appropriate. Forfull credit be sure to show all of your work. 1. What effect does the intensity (amplitude) of a wave have on the emission of electrons from asurface, assuming we are above the threshold frequency (3 points)? 13. Provided the incoming light has enough energy to cause the emission of electrons tooccur in the first place, increasing the intensity of the light causes more electrons to beemitted as a function of time.14. 2. Sodium atoms are much larger than chlorine atoms, but in sodium chloride, the sodium ions are much smaller than the chloride ions. Why (4 points)? 15. If electrons do not repel each other as much in Na+ as they do in Na, they will have lowerenergy and be, on average, closer to the nucleus, resulting in a smaller size. When electronsare added to an atom (Cl), the e--e- repulsion increases, so the electrons have higher energyand they will be on average, farther from the nucleus, thereby creating a larger-size species(Cl-). 16. Comparison of radii, and number of protons and electrons for illustration:17. 18. Radius (pm)19. #protons20. #electrons21. 22. Radius (pm)23. #protons24. #electrons25.Na26. 186 27. 1128. 11 29.Cl30. 99 31. 1732. 1733.Na+34. 95 35. 1136. 10 37.Cl-38. 181 39. 1740. 1841.42.3. A monoatomic ion has a charge of 1- and the electron configuration [Ne] 3s23p6 (3 points).a. Identify and name the ion. _____Cl-, chloride___b. How many unpaired electrons are there in the ground state of this ion? ___0________43.4. Write the electron configurations for the following (7 points): a. N _______1s22s22p3 or [He]2s22p3_________________________________b. Ba ______[Xe] 6s2_____________________________c. Pb2+______[Xe] 4f145d106p2_______________d. Cu ______[Ar] 4s13d10e. Pu ______[Rn]7s25f6f. Te2-______[Kr]5s24d105p6 ≡ [Xe]44.45.46.47.48.49.50.51.52.5. Hydrazine (N2H4) is used as a rocket fuel. Thecombustion products are nitrogen (N2) and water (H2O)(12 points). a. Write the balanced chemical equation and thendraw the Lewis structures of the reactants andproducts. 53. N2H4 (l) + O2 (g) → N2 (g) + 2 H2O (g)54.55.56.57.N NHHHHO O+N N+OH H258.a. Use the above information about bond energies to estimate the change in enthalpy associated with the combustion of 1 mol of hydrazine.59.∆ Hrxn=∑∆ Hbroken−∑∆ Hformed60.∆ HO=O(¿+2∗2∆ HN −H+∆ HN− N]−[∆ HN ≡ N+2∗2 ∆ HO−H]∆ Hrxn=¿61.∆ Hrxn=[495kJmol+2∗2(388kJmol)+163kJmol]−[941kJmol+2∗2(463kJmol)]62.∆ Hrxn=[495kJmol+2(388kJmol)+418kJmol]=−583kJmol63.6. Are the following pairs likely to be miscible (4 points)?a. Br2 and benzene (C6H6) ____miscibleb. Dimethyl ether (CH3CH2OCH2CH3) and acetic acid ____misciblec. Cyclohexane (C6H12) and hexane (CH3CH2CH2CH2CH2CH3) ____miscibled. Carbon disulfide and carbon tetrachloride ____miscible 64.7. Answer the following questions about the phasediagram below (5 points):a. The temperature at point b is the ___normalboiling pointb. Point c is the ___critical point_______c. Phase I is a ______solid__________.d. Phase I is ___more__ dense than phase II. e. Point d is the __triple point__________.65.66.8. Answer the following questions about nitric acid (14 points).a. Draw its Lewis structure (the hydrogen atom is attached to one of the oxygen atoms).Include all three resonance hybrids by alternating the double bond among the threeoxygen atoms. Use formal charge to determine which of the resonance hybrids is mostimportant to the structure of nitric acid. 67.NOOOHNOOOHNOOOHb. The first two structures minimize the formal charge on nitric acid making them more important contributors according to Lewis theory. 68. Identify the electron pair geometry, molecular geometry, bond angle andhybridization around the central atom(s).69. N: electron pair geometry trigonal planar70. molecular geometrytrigonal planar71. bond angle 120°72. O: electron pair geometry tetrahedral73. molecular geometrytrigonal pyramidal74. bond angle<109.5°75.9. Why