KEY-FinalExamStudyGuide_Fall2013

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Name ___________________________ Date ___________________ Class __________________ 15. Look at Figure 9.5 on page 257. Identify each of the ions shown below. N 1 P 3 N 1 ammonium ion a. __________________ b. ______________________ phosphate ion nitrate ion c. ______________________ SECTION 9.2 NAMING AND WRITING FORMULAS FOR IONIC COMPOUNDS (pages 260–266) This section explains the rules for naming and writing formulas for binary ionic compounds and compounds containing a polyatomic ion. Binary Ionic Compounds (pages 260–263) 1. Traditionally, common names were based on some ______________________ property of a compound or its ______________________ source . 2. What is the general name for compounds composed of two elements? They __________________________________________________ are binary compounds. 3. When writing the formula for any ionic compound, the charges of the ions must ______________________ balance . 4. What are two methods for writing a balanced formula? © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved. a. ____________________________________________________________________ finding the least common multiple of the charges b. ____________________________________________________________________ using the crisscross method 5. What are the formulas for the compounds formed by the following pairs of ions? a. Fe 2 , Cl ______________________ FeCl 2 b. Cr 3 , O 2 ______________________ Cr 2 O 3 c. Na , S 2 ______________________ Na 2 S 6. What are the formulas for these compounds? a. lithium bromide ______________________ LiBr b. cupric nitride ______________________ Cu 3 N 2 MgCl 2 c. magnesium chloride ______________________ 7. The name of a binary ionic compound is written with the name of the ______________________ cation first followed by the name of the ______________________ anion . Chapter 9 Chemical Names and Formulas 81
Name ___________________________ Date ___________________ Class __________________ CHAPTER 9, Chemical Names and Formulas (continued) 8. How can you tell that cobalt(II) iodide is a binary ionic compound formed by a transition metal with more than one ionic charge? The name includes a Roman numeral representing the ionic charge of the transition metal cation. 9. Write the names for these binary ionic compounds. a. PbS __________________________________ lead(II) sulfide b. MgCl 2 __________________________________ magnesium chloride c. Al 2 Se 3 __________________________________ aluminum selenide Compounds with Polyatomic Ions (pages 264–266) 10. What is a polyatomic ion? A polyatomic ion contains more than one element. 11. How do you write the formula for a compound containing a polyatomic ion? Write the symbol for the cation followed by the formula for the polyatomic ion and balance the charges. 12. Why are parentheses used to write the formula Al(OH) 3 ? The parentheses indicate how many polyatomic ions are needed in the formula. 13. Complete the table for these ionic compounds containing polyatomic ions. Cation Anion Name Formula NH + 4 S 2 Fe 3+ 2– CO 3 Ag + NO 3 ammonium sulfide iron(III) carbonate potassium cyanide K + CN – silver nitrate (NH 4 ) 2 S Fe 2 (CO 3 ) 3 AgNO 3 KCN © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved. 82 Guided Reading and Study Workbook
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