Section 9.2 Naming and Writing Formulas for Ionic Compounds

Section 9.2: Naming and Writing Formulas for Ionic Compounds Read pages 260-266 Different Types of Ionic Compounds 27 Simple Ionic Compounds (last chapter!) Ionic Compounds Involving Transition Metals 1. 2. 1. 2. 3. Transition metals with only 1 charge Transition metals with more than 1 possible charge Ionic Compounds Involving Polyatomic Ions Binary Ionic Compounds 28 What does the prefix bi mean? TWO  A binary ionic compound is composed of two elements - a metal and a nonmetal  Naming Binary Ionic Compounds 29  If you know the formula of the ionic compound, you can write the name To name any binary ionic compound, place the cation name first, followed by the anion name.  Naming Simple Ionic Compounds (last chapter) 1 Metal + 1 Nonmetal 30 CaCl2 What is the name of the cation? What is the name of the anion? Calcium Chloride Naming Simple Ionic Compounds (last chapter) 1 Metal + 1 Nonmetal 31 Li2O What is the name of the cation? What is the name of the anion? Lithium Oxide Naming Ionic Compounds Containing a Transition Metal with ONE possible charge 1 Transition Metal + 1 Nonmetal 32 ZnS WAIT! What’s special about the cation? Zinc is a transition metal. It has 1 possible charge. What is the name of the cation? We don’t need a Roman numeral because there is only 1 possible charge! What is the name of the anion? Zinc Sulfide Naming Ionic Compounds Containing a Transition Metal with more than one possible charge 1 Transition Metal + 1 Nonmetal 33 Cu2O What’s special about the cation? Copper is a transition metal. It has two possible charges (+1 or +2). Don’t forget the roman numeral!!! (based on oxygen’s charge) What is the name of the cation? Copper (I) What is the name of the anion? Oxide What is the charge on an oxygen ion? 2- Naming Ionic Compounds Containing a Transition Metal with more than one possible charge 1 Transition Metal + 1 Nonmetal 34 CuO What is the name of the cation? What is the name of the anion? Copper (II) Oxide Try It! 35  1. 2. 3. Name the following binary ionic compounds: NaF FeCl3 FeCl2 1. 2. 3. Sodium Fluoride Iron (III) Chloride Iron (II) Chloride Writing Binary Ionic Formulas 36    If you know the name of a binary ionic compound, you can write the formula! Write the symbol of the cation and then the anion. Then, add the subscripts that are needed to balance the charges. The positive charge of the cation must balance the negative charge of the anion so that the net ionic charge of the compound is neutral. Remember the crisscross method? 37 1. Determine the charge on each ion. 2. Cross the charges. 3. Reduce if necessary. 4. Name the compound. Simple Ionic Compounds Formulas 38  Write the formula for Sodium Bromide. First: What is the cation? Second: What is the anion? Na + Br NaBr - Ionic Compounds with Transition Metals 39  Write the formula for Iron (III) Oxide. First: What is the cation? Second: What is the anion? Fe 3+ O Fe2O3 2- 40 K3N CuS NaI K2S CaI2 What is a polyatomic ion? 41  Tightly bound groups of atoms that behave as a unit and carry a charge Polyatomic Ions behave as a UNIT. 42  You CANNOT change the charge or the number of atoms of each element in a polyatomic ion or you will change the identity of that ion!! –  ClO – ClO2 –  ClO3 –  ClO4  Hypochlorite Chlorite Chlorate Perchlorate Naming Compounds with Polyatomic Ions 43 To name a compound containing a polyatomic ion, state the cation first, and then the anion.  Just like naming binary ionic compounds!  Except you DO NOT change the anion name!  Naming Compounds with Polyatomic Ions Example 44 CaSO4 What’s special about the anion? SO4 is a polyatomic ion. What is the name of the cation? What is the name of the anion? Calcium Sulfate Naming Compounds with Polyatomic Ions Example 45 AlPO4 What is the name of the cation? What is the name of the anion? Aluminum Phosphate Naming Compounds with Polyatomic Ions Example 46 NaCH3COO What is the name of the cation? What is the name of the anion? Sodium Acetate Be aware – you can’t forget about your transition metals! 47 CuSiO3 What is the name of the cation? What is the name of the anion? Copper (II) Silicate Writing the Formula of a Compound Containing a Polyatomic Ion 48 Remember: Polyatomic ions behave as a unit.  You cannot change the assigned subscript.   Write the symbol for the cation, followed by the formula for the polyatomic ion, then balance the charges. Use parentheses. Writing Formulas w/ Polyatomic Ions Example 49  Write the formula for Aluminum Chromate. Al 3+ CrO4 2- Al2(CrO4)3 Writing Formulas w/ Polyatomic Ions Example 50  Write the formula for Ammonium Sulfide. NH4 + S (NH4)2S 2- Writing Formulas w/ Polyatomic Ions Example 51  Write the formula for Ammonium Sulfate. NH4 + SO4 (NH4)2SO4 2- Remember – there can still be compounds with transition metals! 52  Write the formula for Tin (II) Cyanide. Sn 2+ CN Sn(CN)2 - 53 a. Mg(OH)2 b. K2SO4 Ionic That is a representative metal or transition metal with only 1 charge 54 Name cation (name stays same) Name anion (ending in –ide) That is a transition metal with multiple possible charges Name cation (use roman numerals) Name anion (ending in –ide) Bonded to a polyatomic ion Name cation (see above) Name anion (polyatomic name) Try It! 55  1. 2. 3. 4. Write the formulas of the following binary ionic compounds: Tin (IV) sulfide Magnesium nitrate Calcium bromide Sodium hydroxide 1. 2. 3. 4. SnS2 Mg(NO3)2 CaBr2 NaOH Quick Quiz Section 9.2 1. The correct name for CrCl3 is 57 a. b. c. d. chromium chlorine. chromium(III) chloride. monochromium trichloride. chromium(III) trichloride. 2. What is the correct formula for strontium nitride? 58 a. b. c. d. Sr3N2 SrN2 Sr2N3 Sr3N 3. Which one of the following compounds is named correctly? 59 a. b. c. d. sodium chlorite, NaClO potassium nitrate, KNO3 sodium acetate, Na2C2H3O2 lithium sulfate, Li2SO3 What’s Next? 60  Book Work Page 258 (#8-9) Page 266 (#17-19) Page 258 #8 and 9 8. Page 266 #17-19 Write the symbol for the ion of 17. Write the formulas of the each element. Classify the ion as following compounds: an anion or cation, and name the a. Beryllium Chloride ion. b. Cesium Sulfide a. Potassium c. Sodium Iodide b. Oxygen d. Strontium Oxide c. Tin (2 electrons lost) 18. Write the formulas of these d. Bromine polyatomic compounds: e. Beryllium a. Chromium (III) nitrate f. Cobalt (3 electrons lost) b. Sodium perchlorate 9. Write the symbol or formula c. Magnesium hydrogen carbonate (including charge) for each of the d. Calcium acetate following ions. 19. Identify any incorrect formulas a. Ammonium ion and explain your reasoning. b. Tin (II) ion a. Mg2(SO4)3 c. Chromate ion b. Rb3As d. Nitrate ion c. BeCl3 61 d. NaF #8 – Write the symbol for the ion of each element. Classify the ion as an anion or cation, and name the ion. 62 a. Potassium → K+, cation, Potassium b. Oxygen → O2-, anion, Oxide a. Tin (2 electrons lost) → Sn2+, cation, Tin (II) b. Bromine → Br-, anion, Bromide c. Beryllium → Be2+, cation, Beryllium d. Cobalt (3 electrons lost) → Co3+, cation, Cobalt (III) #9 – Write the symbol or formula (including charge) for each of the following ions. 63 a. b. c. d. Ammonium ion → NH4+ 2+ Tin (II) ion → Sn 2Chromate ion → CrO4 Nitrate ion→ NO3 #17 – Write the formula for these binary compounds. 64 a. b. c. d. Beryllium Chloride Cesium Sulfide Sodium Iodide Strontium Oxide a. b. c. d. BeCl2 Cs2S NaI SrO #18 – Write the formula these compounds containing polyatomic ions. 65 a. b. c. d. Chromium (III) nitrate Sodium Perchlorate Magnesium hydrogen carbonate Calcium acetate a. b. c. d. Cr(NO3)3 NaClO4 Mg(HCO3)2 Ca(C2H3O2)2 or Ca(CH3COO)2 #19 – Identify any incorrect formulas. Explain your answer. 66 a. b. c. d. Mg2(SO4)3 Rb3As BeCl3 NaF