CHM-115-A Sample Exam a
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1 1. Which of the following is not a mode of nuclear decay? a. neutron capture b. positron emission c. electron capture d. alpha emission e. electron emission 2. Which one of the following processes results in an increase in the atomic number? a. gamma emission b. positron emission c. beta emission d. alpha emission e. corrosion 3. What mode of decay is found in heavy elements that is not found in light elements? a. electron capture b. electron emission c. positron emission d. gamma emission e. alpha emission 4. The only stable isotope of fluorine is 19 9F. What type of radioactivity would you expect from the isotope 17 9F? a. 1 1p + b. 1 0n c. 0-1e - d. 0 +1e + e. 4 2He 1. a 2. c 3. e 4. d Copyright by James P. Birk 1
2 5. Identify the particle X in the following equation for plutonium fission: Pu + 1 0n X Sr n a Ba b. 0-1e - 5. e c Xe d Sr e Ba 6. Radioactive nuclei decay a. at a rate characteristic of the particular nucleus. b. with rates that are highly dependent on temperature. c. to produce protons and electrons. d. only by beta emission. e. at the same rate. 7. Which one of the following is a fission reaction? a. 238 U 234 Th + 4 He b. 235 U + 1 n 90 Sr Xe n c. 28 Mg 28 Al + ß - d. 32 S + ß - 32 P e. 32 S 32 P + ß + 8. Which one of the following represents the binding energy of 20 10Ne? a. 20 Ne! 20 neutrons b. 20 Ne! 10 protons + 10 electrons c. 20 Ne! 19 Ne + 1 neutron d. 20 Ne! 20 protons e. 20 Ne! 10 protons + 10 neutrons 9. Which one of the following is false concerning tritium? a. It is radioactive, emitting alpha particles with a half-life of 12.3 yr. b. It can be produced by neutron bombardment of lithium-6 c. It is formed continuously in the upper atmosphere d. It has the same chemical properties as protium but reacts more slowly e. The atomic number of tritium is a 7. b 8. e 9. a Copyright by James P. Birk 2
3 10. The coordination numbers of cobalt(iii) and of chromium(iii) in their complexes is always a. 4 b. 5 c. 2 d. 3 e Which one of the following complexes has geometric isomers? a. [Pt(NH 3 ) 3 Cl] + (square planar) b. [Co(NCS) 2 Cl 2 ] 2- (tetrahedral) c. [Co(en) 2 Cl 2 ] + d. [Cr(H 2 O) 5 Cl] 2+ e. [Co(NH 3 ) 5 Cl] The following represents a pair of optical isomers: (en = ethylenediamine) a. [CoF 6 ] 3- b. [Co(en)Cl 4 ] - c. [Co(en) 3 ] 3+ d. trans-[co(nh 3 ) 4 Cl 2 ] + e. cis-[co(nh 3 ) 4 Cl 2 ] A compound has the empirical formula CoCl 3. 5NH3. One mole of this compound yields two moles of AgCl(s) on treatment with AgNO 3 (aq) in solution. What is the formula of the compound? a. [Co(NH 3 ) 5 Cl]Cl 2 b. [Co(NH 3 ) 5 ]Cl 3 c. [Co(NH 3 ) 3 Cl 3 ]. 2NH 3 d. [Co(NH 3 ) 4 Cl 2 ]Cl. NH 3 e. [Co(NH 3 ) 2 Cl 2 ]Cl. 3NH Which of the following reactions provides evidence for linkage isomerism? a. [Co(NH 3 ) 5 Cl] 2+ + H 2 O [Co(NH 3 ) 5 H 2 O] 3+ + Cl - b. 5H 2 O 2 + 2KMnO 4 + 3H 2 SO 4 K 2 SO 4 + 2MnSO 4 + 8H 2 O + 5O 2 c. [Fe(CN) 6 ] 4- + [IrCl 6 ] 2- [Fe(CN) 6 ] 3- + [IrCl 6 ] 3- d. [Cr(H 2 O) 5 NC] 2+ [Cr(H 2 O) 5 CN] 2+ e. [Co(NH 3 ) 5 Cl] 2+ + [Cr(H 2 O) 6 ] H 2 O [Co(H 2 O) 6 ] 2+ + [Cr(H 2 O) 5 Cl] NH e 11. c 12. c 13. a 14. d Copyright by James P. Birk 3
4 15. Which one of the following is pentaamminechlorocobalt(iii) chloride? a. [Co(NH 3 ) 5 Cl]Cl b. [Co(NH 3 ) 5 Cl]Cl 2 c. [Co(NH 3 ) 5 Cl]Cl 3 d. [Co(NH 3 ) 5 Cl] e. [Co(NH 3 ) 5 Cl]Cl Predict the number of unpaired electrons in [Fe(CN) 6 ] 4- and [FeF 6 ] 4-, respectively. a. 4 and 0 b. 0 and 2 c. 0 and 3 d. 0 and 4 e. 2 and Which one of the following complex ions is colorless? a. [Ni(H 2 O) 6 ] 2+ b. [Zn(H 2 O) 6 ] 2+ c. [Cr(H 2 O) 6 ] 3+ d. [Ti(H 2 O) 6 ] 3+ e. [Fe(H 2 O) 6 ] Which one of the following complex ions is paramagnetic? a. [TiCl 6 ] 2 b. [FeF 6 ] 4 outer orbital c. [Zn(NH 3 ) 4 ] 2+ d. [Fe(CN) 6 ] 4 inner orbital e. [CrO 4 ] Consider a complex in which manganese(iii) is bonded to six identical ligands. Which one of the following ligands will result in the smallest value of the ligand field splitting? a. Cl b. NH 3 c. H 2 O d. F e. CN 15. b 16. d 17. b 18. b 19. a Copyright by James P. Birk 4
5 20. Which of the following is not a normal property of a metal? a. conduction of electricity b. malleability c. ability to form cations d. low electron affinity e. high ionization energy 21. Which element group is the most reactive of all the metallic elements? a. alkali metals b. alkaline earth metals c. coinage metals d. transition metals e. inner transition metals 22. Beryllium differs from the other alkaline earth metals in that its compounds form a. ionic solids b. covalent solids c. molecular solids d. metallic solids e. amorphous solids 23. In addition to sodium and potassium, what other element does lithium resemble chemically? a. He b. Be c. Mg d. Hg e. Pb 24. Which elemental halogen(s) can be used to prepare I 2 from NaI? a. F 2 only b. Cl 2 only c. Br 2 only d. both Cl 2 and Br 2, but not F 2 e. F 2, Cl 2, and Br The most stable allotrope of oxygen is. a. H 2 O b. O 3 c. O 2 d. HClO e. O Copyright by James P. Birk e 21. a 22. b 23. c 24. e 25. c
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