Chem Exam 2

Chem Exam 2 - CHEM 161-2011 EXAM II REVIEW DRAFT 3 Review...

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Chem 161-2011 Exam II review 1 CHEM 161-2011 EXAM II REVIEW DRAFT 3 Review Part 1: 9:50-11:10 AM, Friday, October 28 th , 2011, B&O sections 5.4 ± 6.6 Part 2: 9:50 ± 11:10 AM, Tuesday, November 1 st , 2011, B&O sections 7.1 ± 8.4 Exam 9:40 ± 11:00 PM, Wednesday, Nov. 2 nd , SH 123 for sections 50-55 Chapters 5.4 ± 8.4 Dr. Ed Tavss
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Chem 161-2011 Exam II review 2 BEGIN FRIDAY±S REVIEW SESSION HERE ² CHAPTERS 5.4 TO 6.6 NOMENCLATURE IONS x Metals tend to form cations. x Nonmetals tend to form anions. x Elements in Groups 1A, 2A and 3A form ions with charges of +1, +2 and +3, respectively. x The anions from groups 4A to 7A have charges equal to the group number minus 8. x The cations are simply called by their name; e.g., Na + is ³sodium ion´. x A monatomic anion changes the ending to ³ide´; hence, Cl - is ³chloride anion´; O 2- is ³oxide anion´.
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Chem 161-2011 Exam II review 3 NOMENCLATURE PERIODIC TABLE TYPE II 1A 2A 3A 4A 5A 6A 7A 8A H + He Li + Be 2+ B C N O F Ne Na + Mg 2+ 3B 4B 5B 6B 7B 8B 8B 8B 1B 2B Al 3+ Si P S Cl Ar K + Ca 2+ Sc Ti V Cr Mn Fe Co Ni Cu Zn 2+ Ga 2+ Ge As Se Br Kr Rb + Sr 2+ Y Zr Nb Mo Te Ru Rh Pd Ag + Cd 2+ In Sn Sb Te I Xe Cs + Ba 2+ La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn MONOATOMIC ANIONS H - N 3- O 2- F - S 2- C l - B r - I - Type I Alkali and alkali earth metals [Formula] Ionic Compounds Transition metals [Formula] Ionic compounds Type III Non-metals & metalloids Molecular Covalent Compounds ET: Type I and Type II are ionic compounds; Type III is molecular covalent compounds. ET: Discuss ionic compounds vs. molecular compounds. A molecular compound can exist by itself, e.g., H 2 O. An ionic compound, e.g., NaCl, does not exist as an individual molecule. It is either in a crystal lattice, with many other ions, or in the gas phase as individual ions. ET: Discuss charges. Groups 1A and 2A are always charges of +1 and +2, respectively; Groups 5A-7A, when anions, the charges are always group no. ± 8. Middle group, the transition metals, form cations with varied charge. NH 4 +
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Chem 161-2011 Exam II review 4 HILL & PETRUCCI ET AL. CHAPTER 2 ± ATOMS, MOLECULES AND IONS Nomenclature Rules Groups IA & IIA cations do not vary in charge. Virtually all other cations (IIIA to VIIA) and transition metals vary in charge No anions (monoatomic/polyatomic) vary in charge. Name from left to right (e.g., sodium chloride) Ca 3 N 2 Note that since Ca is Ca 2+ , and N is N 3- , to achieve charge neutrality requires there to be 3 Ca 2+ and 2 N 3- Which type of nomenclature? Type I nomenclature: calcium nitride Type II nomenclature: calcium(II) nitride Type III nomenclature: tricalcium dinitride Type I - ALKALI AND ALKALI EARTH METALS Groups 1A and 2A cations (and some others, e.g., Al 3+ , Zn 2+ and Ag + ) never change charge. Simplest nomenclature (no prefixes or Roman numerals) Name monoatomic anion as ²ide³ (e.g., sodium chloride) or polyatomic anion as is (e.g., potassium sulfate).
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Chem Exam 2 - CHEM 161-2011 EXAM II REVIEW DRAFT 3 Review...

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