6C-P-final hoeger

6C-P-final hoeger - PRACTICE Final Exam Chem 6C THIS IS AN...

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PRACTICE Final Exam Chem 6C THIS IS AN ACTUAL FINAL EXAM GIVEN BY DR. HOEGER. GIVE YOURSELF 2.5 HOURS TO COMPLETE IT. ANSWERS TO THIS PRACTICE FINAL WILL NOT BE POSTED NOR PROVIDED. QUESTIONS MARKED WITH AN ARE WORTH 6 POINTS EACH; ALL OTHERS ARE WORTH 3 POINTS
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(Questions 1 and 2) Americium-241 is used in a number of smoke detectors; as this radioisotope decays it causes particles to ionize, conduct an electric current and thereby cause the alarm to buzz. The complete decay of Am 241 involves (successively) α,α,β,α,α,β,α,α,α,β,α and β production. 1. The isotope that undergoes the first β particle emission is: a. U-233 b. Pa-233 c. Pa-239 d. Am-241 2. The isotope obtained when Am-241 has completed this decay sequence is: a. Pb-208 b. Re-205 c. Bi-209 d. Au-209 3. Species with unpaired electrons are paramagnetic and a. are seldom found in compounds of Groups IA, IIA, and IIIA. b. exist for at least one oxidation state of transition metals. c. are attracted to a magnetic field. d. Each of these statements is true. 4. Diamagnetic substances a. are attracted to a magnetic field because they contain unpaired electrons. b. are repelled by a magnetic field because they contain only paired electrons. c. become permanently aligned in a magnetic field. d. are not affected by a magnetic field. 5. Which of the following is paramagnetic? a) Zn(H 2 O) 6 +2 b) Co(NH 3 ) 6 +3 c) Ni(CN) 6 -2 (square planar) d) Cu(H 2 O) 6 + e) none of these 6. Of the following, the central metal ion most likely to form a colorless complex is a. Ti 3+ . b. Mn 4+ . c. Co 2+ . d. Zn 2+ . 7. The half-life of nickel-63 is 85 years. How old is a painting with an activity that is 3.5% of the steady-state rate for Ni-63? a. 0.027 yr b. 3.0 yr c. 410 yr d. 2400 yr 8. If water is replaced by ammonia in the [Fe(H 2 O) 6 ] 3+ complex, the splitting of the d- orbitals would a. increase. b. decrease. c. not be affected. d. increase for the iron complex, but might decrease with other metals. 9. Water gas, a commercial fuel, is made by the reaction of hot coke with steam. C(s) + H 2 O(g) ----> CO(g) + H 2 (g) When equilibrium is established at 800°C the concentrations of CO, H 2 , and H 2 O are 4.00 x 10 -2 , 4.00 x 10 -2 , and 1.00 x 10 -2 mole/liter, respectively. What is the value of G° for this reaction at 800°C? a) 109 kJ
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6C-P-final hoeger - PRACTICE Final Exam Chem 6C THIS IS AN...

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