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UGA CHEM 1110 - Ionic Compounds KEY

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Chemistry 1110 Ionic Compounds I. Tell how many valence electrons the following elements have, then determine what charge ion the they will make, (if any): K Si Ba Al S Rb Cl Mg 1, +1 4, +/-4 2, +2 3, +3 6, -2 1, +1 7, -1 2, +2 Cs B N O F Sr Xe C 1, +1 3, +3 5, -3 6, -2 7, -1 2, +2 8, n/a 4, +/-4 II. For the following polyatomic ions listed on the left, give the formula and charge. For the ions shown on the right, give the appropriate name. hydroxide oxalate NO3- OCl- OH- C2O42- nitrate hypochlorite phosphate sulfite CrO42- CH3COO- PO43- SO32- chromate acetate bicarbonate ammonium H3O+ CO32- HCO3- NH4+ hydronium carbo nate III. For each pair of ions below, what ratio of ions below would be required to form a neutral compound? Give the appropriate formula for the ionic compound that would form. Li+ and Cl- K+ and S2- Mg2+ and P3- 1:1 LiCl 2:1 K2S 3:2 Mg3P2 H+ and NO3- Ba2+ and OH- NH4+ and CO32- 1:1 HNO3 1:2 Ba(OH)2 2:1 (NH4)2CO3 IV. Determine the appropriate chemical formula of an ionic compound made with ions formed from the following elements or polyatomic ions: Calcium and Oxygen Sodium and Cyanide Ca2+ and O2- CaO Na+ and CN- NaCN Potassium and Nitrogen Aluminum and Fluorine K+ and N3- K3N Al3+ and F- AlF3 Ammonium and Phosphate Strontium and Acetate NH4+ and PO43- (NH4)3PO4 Sr2+ and CH3COO- Sr(CH3COO)2 Hydrogen and Sulfate Magnesium and Nitrate H+ and SO42- H2SO4 Mg2+ and NO3- Mg(NO3)2V. Determine the charge on each atomic or polyatomic ion for the ionic compounds listed: Fe2O3 Fe: +3 O: -2 AgCl Ag: +1 Cl: -1 TiO2 Ti: +4 O: -2 NaC7H5O2 O: (-2 charge)(3qty) = Fe: (2qty)(+3charge) O: -2(2) = Ti: 1(+4) Na: +1 C7H5O2: -1 KClO4 ScN Ca(BrO3)2 FeO K: +1 ClO4: -1 Sc: +3 N: -3 Ca: +2 BrO3: -1 Fe: +2 O: -2 OsO4 NaClO2 CaH2 CrCl3 Os: +8 O: -2 Na: +1 ClO2: -1 Ca: +2 H: -1 Cr: +3 Cl: -1 VI. Give the appropriate name for the following cations, or the cation symbol for the following cation names: Na+ NH4+ iron (I) aluminum Sodium ammonium Fe+ Al3+ Ni2+ Mg2+ cesium osmium (VI) Nickel (II) magnesium Cs+ Os6+ VII. Give the appropriate name for the following anions, or the anion symbol for the following anion names: S2- SO42- bicarbonate phosphide Sulfide sulfate HCO3- P3- F- H- bromide dichromate Fluoride hydride Br- Cr2O72- VIII. Determine the appropriate name for the following chemical formulas NaBr MgI2 KCl Ca(OH)2 sodium bromide magnesium iodide potassium chloride calcium hydroxide Al2O3 Ba(NO3)2 TiO2 Ni(CH3CO2)2 aluminum oxide barium nitrate titanium (IV) oxide nickel (II) acetate NH4NO3 AgCN Fe2O3 FeO ammonium nitrate silver cyanide iron (III) oxide iron (II) oxide IX. Determine the appropriate chemical formula for the following chemical names rubidium sulfide calcium phosphate sodium selenide Rb2S Ca3(PO4)2 Na2Se aluminum carbonate magnesium iodide ammonium fluoride Al2(CO3)3 MgI2 NH4F lithium chloride iron (III) sulfate hydrogen fluoride LiCl Fe2(SO4)3

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