Chemistry 1A Fall 2006 Final Exam Version B Dec 12 2006 180 min closed book Name SID GSI Name There are 60 Multiple choice questions worth 4 34 points each There are 13 short answer questions For the multiple choice section fill in the Scantron form AND circle your answer on the exam Put your final answers in the boxes provided Answers outside the boxes may not be considered in grading The homework and chemquizzes that each question is based upon is listed after the question e g HW 1 13 CQ 7 3 Question Page Points Question 61 63 14 22 Question 64 67 15 28 Question 69 69 16 12 Question 70 72 17 12 Question 72 73 18 16 Total Score 90 Page 1 1 Which is a possible electronic configuration for O A B C D E 1s22s22p4 1s22s22p23s1 1s22s22p63s1 1s22s22p5 None of these 2 The following is a plot of electron kinetic energy vs photon energy for the interaction of photons and oxygen atoms What does point I represent Ek II I hv A B C D E electronegativity of O electron affinity of O ionization energy of O atomic radius of O photons emitted by O 3 In a one mole sample of carbon atoms how many protons are in each nucleus A 5 4 B 6 C 7 D 8 E cannot be determined In a one mole sample of carbon atoms how many neutrons are in each nucleus A 5 B 6 C 7 D 8 E cannot be determined 5 What is the minimum energy J required to eject an electron from chromium metal The work function for chromium metal is 7 00 10 19 J HW 1 14 A B C D E 7 00 10 19 1 41 10 18 2 11 10 12 4 45 10 23 8 11 10 18 Page 2 6 What wavelength radiation nm must be used to eject electrons from chromium metal with a velocity of 1 50 x 106 m s The work function for chromium metal is 7 00 10 19 J HW 1 14 A B C D E 4 67 23 4 101 512 115 7 What energy in Rydbergs is required to excite an He 1 ion from its ground state to its first excited state HW 1 23 1 25 A B C D E 14 25 101 3 87 8 How many electrons in an atom can have the quantum numbers n 5 l 2 HW 1 53 A 1 B 2 C 6 D 10 E 32 9 Which statement is true for many electron atoms HW 1 59 discussion A B C D E s electrons shield more efficiently that p electrons The effective nuclear charge is independent of the number of electrons in an atom Electrons with l 2 are better at shielding than those with l 1 Electrons may share the same set of quantum numbers for short times Electrons cannot share orbitals 10 Which neutral element would have the ground state electronic configuration Ne 3s23p5 HW 1 67 A O B Cl C Ar D P E Al 11 What is the arrangement of the following atoms in order of decreasing atomic radius Sulfur S Chlorine Cl Silicon Si HW 1 82 A B C D E S Cl Si Si Cl S Cl S Si S Si Cl Page 3 12 Which would be the mass spectrum of the products when acetylene C2H2 is burned in oxygen A 18 44 B 18 44 C 18 44 D 18 44 E 18 44 13 What is the formal charge on the oxygen atom in the ONF molecule HW 2 33 2 43 A 2 B 1 C 0 D 1 E 2 14 What is the shape of the ONF molecule HW 2 33 3 7 A B C D E Linear Bent Trigonal planar Trigonal pyramid Tetrahedral 15 Which intermolecular forces are important in liquid ONF HW 5 1 I Dispersion VanderWaals forces II Dipole dipole forces III Hydrogen bonding A I only B II only C III only D I and II E I II and III D 120 E 180 16 What is the I I I bond angle in I3 HW 3 9 A 60 B 90 C 109 17 Which of the following is most paramagnetic HW 3 47 A B C D E 2p F2 F2 F2 2 F2 F2 2 2p 2p 2p 2s 2s Page 4 18 What is the hybridization of sulfur in SF4 HW 3 33 A B C D E sp sp2 sp3 dsp3 d2sp3 Use the table of molecular orbitals for a diatomic molecule to answer questions 19 22 The arrow indicate the internuclear axis A B C D E 19 Which antibonding orbital would form between atomic s orbitals A A B B C C D D E E 20 Which sigma bonding orbital would form between atomic p orbitals A A 21 Which is a A A B B C C D D E E D D E E D D E E molecular bonding orbital B B C C 22 Which is the highest energy orbital A A B B C C For questions 23 27 consider a mixture of four gases Kr He Ne and Ar in a closed 10 L container There are 10 grams of each gas present 23 Which gas has the highest partial pressure A Kr B Ne C He D Ar E all are equal D Ar E all are equal 24 Which particles have the highest rms velocity A Kr B Ne C He 25 Which particles have the highest average kinetic energy A Kr B Ne C He D Ar E all are equal Page 5 26 If the partial pressure of He is 2 0 atm what is the temperature of the system A B C D E 98K 270K 323K 440K 60K 27 If the temperature is doubled which is true of the energy of the system A B C D E The energy doubles The energy increases by a factor of 21 2 The energy decreases by a factor of 2 The energy increases but the factor cannot be determined The energy decreases but the factor cannot be determined Continue with the next question 28 What is the change in internal energy of a gas undergoing the following process A gas sample is heated in a cylinder by supplying 524 J of heat while a piston compresses the gas by doing 313 J of work HW 6 5 A B C D E 211 J 211 J 837 J 837 J 0J 29 Estimate the boiling point of dimethyl ether using Trouton s rule which states that the entropy of vaporization of most liquids is about 90 J K mol The enthalpy of vaporization of dimethyl ether is 21 51 kJ mol HW 7 16 A B C D E 273K 425K 239K 310K 70K 30 Which of the following will result in a change in the solubility of AgCl for the reaction shown assume Ksp for AgCl is 10 8 AgCl s A B …