PAL Worksheet - Naming Ionic Compounds

PAL— Naming Ionic Compounds Part I: Naming Type I Ionic Compounds 1. There are some metal ions which have charges that are categorized as Type I ions and have charges which are invariable. Use this information to answer parts a and b. a. The charges from Group 1A and Group 2A are Type I ions, meaning that they are metals which have charges that are invariable. List these ions below along with their charges. The table below provides you with the atomic number. Fill in the missing information to identify each of these ions. The first row has been filled in as an example. Atomic Number (z) 3 Element Symbol Charge Group Number Group Name Li +1 1A Alkali Metals 11 19 37 55 4 12 20 28 56 b. There are three additional Type I ions with the atomic numbers 13, 30, and 47. Identify these ions and their charges. Is there a way in which you can remember where these are and what their respective charges are? Atomic Number (z) Element Symbol Charge 13 30 47 We can work backwards to derive the underlying rules when naming ionic compounds. Being able to work backwards to derive the underlying rules will help if you are ever unsure of an ion’s charge 1 should you forget it. Learning the rules will also require you to memorize less information. For instance, instead of remembering all of the charges of the positively charged ions, we can just use the trends covered in question 1 to know the charge. Li3N = lithium nitride NaNO3 = Sodium Nitrate Mg(ClO4)2 = magnesium perchlorate. 2. The metal cation is positioned __________ and the non-metal anion is positioned __________. a. What did we do to the name of the cation when it went from being a pure element to being part of a compound? Hint: Does the name change? b. What did we do to the name of the monatomic anion when it went from being a pure element to being part of a compound? 3. What did we do to the name of the polyatomic anion when it became part of a compound? 4. When are parentheses used in writing the formulas of ionic compounds? 2 Part II: Naming Type II Ionic Compounds A second type of metal ion is categorized as Type II ions, which have variable charges. Use the following examples of Type II ionic compounds as a guide to answer questions 5 and 6. Cu(NO2)3 = copper (III) nitrite Sn(PO4)2 = tin (IV) phosphate 5. What are the cation charges in these two examples? Explain how you figured out each charge based only on the formulas. charge on Cu = explanation: charge on Sn = explanation: 6. How do we know what the charges of the cation are if we are only given the name of the ionic compound? 7. How can we easily determine the charge of the cation if we are only provided the formula? 3 Part III: Check your current knowledge 8. Below is a list of ionic compounds identified by name. Provide the correct formula and identify whether it is a type I or type II ionic compound. Name Ex: Magnesium Perchlorate Chemical Formula Type I or Type II Ionic Compound? Mg(ClO4)2 Type I Silver Phosphate Magnesium Carbonate Chromium (II) Bicarbonate Magnesium Sulfite Cobalt (III) Carbonate Sodium Periodate Tin (III) Chromate Phosphorous Acid Magnesium Permanganate Chromium (III) Oxide Copper (II) Sulfate Ammonium Acetate Nickel (II) Iodide Barium Permanganate 4 9. Below is a list of ionic compounds identified by chemical formula. Provide the correct name and identify whether it is a type I or type II ionic compound. Chemical Formula Ex: LiCl Name Type I or Type II Ionic Compound? Lithium Chloride Type I MgF2 NCl6 BaBrl2 HCl(aq) KIO4 Ca(NO3)2 Co3(SO4)3 H3PO4(aq) Li2Cr2O7 AgClO NO3 Sr(NO3)2 HNO3(aq) Au(C2H3O2)3 5 6