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Chemical Nomenclature Ca2+ Carbide Ion Rubidium Name: ANSWER KEY Chem 10, Section: [Individual exercise] Exercise Date: Chemical Nomenclature Write the names and formulas for the following inorganic compounds in the spaces provided. Part 1: Ions and Ionic Compounds Write formulas/charges or names as appropriate for each of the following monatomic ions. 1. Calcium ion Ca2+ 6. C4− carbide ion 2. Phosphide ion P3− 7. Rb+ rubidium ion 3. Iodide ion I− 8. Pb4+ lead(II) ion 4. Gallium ion Ga3+ 9. S2− sulfide ion 5. Titanium(IV) ion Ti4+ 10. Cr2+ chromium(II) ion Write formulas or names as appropriate for each of the following ionic compounds. 1. Magnesium nitride Mg3N2 6. SrI2 strontium iodide 2. Lithium oxide Li2O 7. Ba3(PO4)2 barium phosphate 3. Aluminum sulfite known?? 8. (NH4)2O does not exist 4. Copper(II) bicarbonate known?? 9. Fe(ClO)3 iron(III) chlorate 5. Sodium nitrate NaNO3 10. ZnCrO4 zinc chromate Part 2: Covalent Compounds Write formulas or names as appropriate for each of the following covalent compounds. 1. Dichlorine monoxide Cl2O 6. AsI3 arsenic triiodide 2. Disulfur dichloride S2Cl2 7. P4O10 tetraphosphorus decaoxide 3. Carbon tetrafluoride CF4 8. Cl2O7 dichlorine heptaoxide 4. Phosphorus pentachloride PCl5 9. SeCl6 not known 5. Nitrogen tribromide NBr3 10. NO nitrogen monoxide Part 3: Acids Write formulas or names as appropriate for each of the following acids. 1. Hydroiodic acid HI(aq) 6. HCN(aq) hydrocyanic acid 2. Carbonic acid H2CO3 7. H2C2O4(aq) oxalic acid 3. Chlorous acid HClO2 8. HNO2(aq) nitrous acid 4. Sulfuric acid H2SO4 9. H2Cr2O7(aq) dichromic acid 5. Phosphorous acid H3PO4 10. HMnO4(aq) permanganic acid Page 1 of 3 Part 4: Hydrates (optional – check with your instructor to see if you are responsible for this section) Write formulas or names as appropriate for each of the following hydrates. ∙ 1. Magnesium sulfate heptahydrate MgSO4∙7H2O 6. CoSO4 H2O cobalt sulfate monohydrate 2. Copper(I) sulfate pentahydrate known?? 7. Na2CrO4∙4H2O sodium chromate tetrahydrate 3. Potassium phosphate decahydrate known?? 8. CuF2∙2H2O copper(II) fluoride dihydrate 4. Calcium chloride hexahydrate CaCl2∙6H2O 9. Sr(NO3)2∙6H2O known?? Sr(NO3)2∙4H2O is known. 5. Iron(III) nitrate nonahydrate Fe(NO3)3∙9H2O 10. ZnSO4∙7H2O zinc sulfate heptahydrate Part 5: Nomenclature of Ionic Compounds, Covalent Compounds and Acids Classification Name or Formula 1. C3O2 covalent tricarbon dioxide 2. IF7 covalent iodine heptafluoride 3. Rb2CO3 ionic rubidium carbonate 4. SnS4 ionic tin(IV) sulfide 5. Au(CN)3 ionic gold(III) cyanide 6. H2CrO4(aq) covalent chromic acid 7. H3P(aq)???? Is PH3(aq) [aq. soln. of phosphine] or H3PO4(aq) [phosphoric acid] meant? 8. Li3PO4 ionic lithium phosphate 9. Mg3N2 ionic magnesium nitride 1 Ti(C2H3O2)4 ????? does it exist? ??? 1 Fe2O3 ionic iron(III) oxide 1 NaH ionic sodium hydride 1 Br3O8 ????? not known ??? 1 MnS2O3 ionic manganese(II) thiosulfate 1 NH4NO2 ionic ammonium nitrite 1 Cd(ClO2)2 ionic cadmium chlorite 1 Ba(HSO3)2 ??? ionic barium hydrogen sulfite (does it exist?) 1 Cu2O ionic copper(I) oxide 1 NiBr3 ????? not known ??? 2 Sr(OH)2 ionic strontium hydroxide 2 Perchloric acid covalent HClO4 1 2 Potassium permanganate ionic KMnO4 2 Calcium hydride ionic CaH2 2 Vanadium(II) bicarbonate ???? does not exist? ??? 2 Bismuth(V) nitrate ?????? does not exist? ??? 2 Rubidium peroxide ionic Rb2O2 Page 2 of 3 27. Strontium hydrogen phosphite ionic Sr(H2PO3)2 28. Hydrofluoric acid covalent HF 29. Chromium(III) thiocyanate does it exist? ??? 30. Acetic acid covalent HC2H3O2 or CH3COOH (H = acidic hydrogen) 31. Molybdenum(IV) carbonate does it exist? ??? 32. Tetraiodine nonaoxide (??) I4O9 33. Diphosphorus tetrafluoride covalent P2F4 34. Aluminum sulfate ionic Al2(SO4)3 35. Ammonium hydroxide does not exist does not exist 36. Sodium dichromate ionic Na2CrO4 37. Carbon disulfide covalent CS2 38. Nickel(II) oxalate ionic NiC2O4 39. Barium selenide ionic BaSe 40. Silver bisulfate does it exist? ??? Questions 1. How are the following types of compounds recognized from their formulas? Ionic NH4 or a metal symbol is in front of the chemical formula (this rule is not a definition of ionic compound; the rule works well for the introductory and general chemistry quizzes and exams; the general and correct definition: ionic compound is a compound that is built of ions) Covalent No NH4 or a metal symbol is in front of the chemical formula (this rule is not a definition of covalent compound; the rule works well for the introductory and general chemistry quizzes and exams.) Acid Not H2O or H2O2 and one of the following two: (1) the formula begins with the symbol of hydrogen (H), has a symbol of oxygen (O) inside, and may or may not be followed by (aq); or (2) the formula begins with the symbol of hydrogen (H) and is followed by (aq). Acids are molecular covalent compounds or aqueous solutions of those. 2. When do parentheses appear in the formulas of ionic compounds? They embrace the formula of a polyatomic ion if the ion is present in the quantity of more than one per formula unit and the quantity is indicated by a subscript 2, 3, or 4. 3. Do Roman Numerals appear in the names of ionic or covalent compounds? Explain why they are used. Ionic. They appear if two or more common cations are known for a metallic element with which the formula of the compound may begin. 4. Do Greek Prefixes appear in the names of ionic or covalent compounds? Explain why they are used. Covalent. They appear to indicate the numbers of atoms of each element present in a molecule or a formula unit of the compound. 5. What is the relationship between the number of hydrogens in an acid and the charge on the anion that they are combined with? The hydrogen atoms whose symbols appear in the front of the formula of an acid can be detached from the molecule of the acid as H+ ions. The number of those atoms detached define the negative charge of the corresponding anion. Page 3 of 3 .
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