Name ___________________________________________________________ Date __________________ Ionic Compounds and Metals Section 3 Names and Formulas for Ionic Compounds Scan Section 3 of your text. Use the checklist below as a guide. • Read all section titles. • Read all boldfaced words. • Read all tables and diagrams. • Look at all figures and read the captions. • Study the example problems and note what they are intended to solve. • Think about what you already know about the formation, formulas, and naming of ions and ionic compounds. Write three facts that you discovered about the names and formulas of ionic compounds. Ionic compounds are named using a convention that involves the cation followed by the anion 1. ______________________________________________________ The formulas of ionic compounds are determined based on the principle of charge neutrality, where the total positive charge of the cations must 2. ______________________________________________________ balance the total negative charge of the anions. Ionic compounds may have common systematic names or stock names, especially for transition metal ions that can exhibit multiple charges. 3. ______________________________________________________ Use your text to define each term. the chemical formula of an ionic compound that lists the ions in the lowest formula unit ratio that equals a neutral electrical charge. ________________________________________________________ monoatomic ion ________________________________________________________ oxidation number a number assigned to an element in chemical combination which represents the number of electrons lost ), by an atom of that element in the compound. ________________________________________________________ polyatomic ion ________________________________________________________ oxyanion (as in the sulfate and carbonate ions). ________________________________________________________ An ion made of only one atom an ion that contains more than one atom. an anion containing one or more oxygen atoms bonded to another element ________________________________________________________ Define the following term. transfer Chemistry: Matter and Change a chemical reaction (as a transamination) in which a group is transferred from one molecule to another. ________________________________________________________ 88 Science Notebook Name ___________________________________________________________ Date __________________ Section 3 Names and Formulas for Ionic Compounds (continued) Formula for an Ionic Compound Use with Example Problem 1, page 220. Solve Read Example Problem 1 in your text. You Try It Problem Calcium can form a cation with a 2+ charge. Write the formula for the ionic compound formed from calcium ion and chlorine. 1. Analyze the Problem Known: the ionic forms of the component elements ______________________________________________ Ca^2 CI^1and ______________________________________________ + Unknown: ______________________________________________ 2. Solve for the Unknown two The smallest number that is divisible by both ionic charges is ______, one two so the compound contains _____ calcium ion(s) and _____ chloride CaCl2 ion(s). The formula for the ionic compound formed is ________. 3. Evaluate the Answer The overall charge on one formula unit of this compound is zero. 1 Formula for a Polyatomic Ionic Compound Use with Example Problem 3, page 222. Ca ion(s) (2+/Ca ion) + 2 Cl ions (1− /Cl ion) = 0 Solve Read Example Problem 3 in your text. You Try It Problem Write the formula for the ionic compound formed from the calcium ion and the bromate ion. 1. Analyze the Problem Known: Ca^2+ the ionic forms of the component elements _______ BrO3^- and _______ Unknown: Chemistry: Matter and Change The compound formed from the two ions ___________________________________________ 89 Science Notebook Name ___________________________________________________________ Date __________________ Section 3 Names and Formulas for Ionic Compounds (continued) 2. Solve for the Unknown two The smallest number that is divisible by both ionic charges is ______, two one so ______ bromate ions combine with _______ calcium ion. The Ca(BrO3)2 formula for the ionic compound formed is __________. 3. Evaluate the Answer The overall charge on one formula unit of this compound is zero. 1 Ca ion (2+/Ca ion) + 2 Names for Ions and Ionic Compounds Use with page 222–224. BrO3 ions (1−/BrO3 ion) = 0 Classify the ions listed below as monatomic or polyatomic cations or anions. If the ion is a polyatomic anion, indicate whether it is an oxyanion. polyatomic anion CN− _______________________________________ MnO4− _______________________________________ Ba2+ _______________________________________ Fe(CN)64− _______________________________________ NH4+ _______________________________________ N3− _______________________________________ Hg22+ _______________________________________ S2O32− _______________________________________ O2− _______________________________________ polyatomic anion , oxyanion manatomic cation polyatomic anion polyatomic cation monatomic anion polyatomic cation polyatomic anion , oxyanion monaatomic anion Identify the ionic compounds listed below. Chemistry: Matter and Change calcium oxide CaO _______________________________________ KMnO4 _______________________________________ Sr(IO3)2 _______________________________________ NH4OH _______________________________________ Fe2S3 _______________________________________ Sn(NO3)4 _______________________________________ Pb3(PO4)2 _______________________________________ Hg2SO4 _______________________________________ PtCl4 _______________________________________ potassium permaganate strontium iodate ammonium hydroxide iron (iii) sulfide tin (iv) nitrate Lead (ii) phosphate mercury (i) sulfate platinum (iv) chloride 90 Science Notebook