1. The Structure of MatterSection 3 EQ: How are ionic compounds named? Standards: SC.912.P.10.12 Differentiate between chemical and nuclear reactions. SC.912.P.10.12 SC.912.P.8.2 Differentiate between physical and chemical properties and physical and chemical changes of matter. SC.912.P.8.2 SC.912.P.8.7 Interpret formula representations of molecules and compounds in terms of composition and structure. SC.912.P.8.7 SC.912.P.8.5 Relate properties of atoms and their position in the periodic table to the arrangement of their electrons. SC.912.P.8.5 SC.912.P.8.8 Characterize types of chemical reactions, for example: redox, acid-base, synthesis, and single and double replacement reactions. SC.912.P.8.8

2. The Structure of MatterSection 3 Class Starter. Check EQ and MV. A compound word is two words joined together to form a new word. Use the list of words on below to form FIVE compound words. bergsnowsideflake daytackyardice eyebugthumbfrog flagclothdreambrow ladyburnsbackstack

3. The Structure of MatterSection 3 Naming Ionic Compounds 〉 How are ionic compounds named? 〉 The names of ionic compounds consist of the names of the ions that make up the compounds. Names of cations include the elements of which they are composed. Example: a sodium atom loses an electron to form a sodium ion, Na +. Names of anions are altered names of elements. Example: a fluorine atom gains an electron to form a fluoride ion, F –.

4. The Structure of MatterSection 3 Naming Ionic Compounds, continued An ionic compound must have a total charge of zero. –If an ionic compound is made up of ions that have different charges, the ratio of ions will not be 1:1. CaF 2 Some cation names must show their charge. –Transition metals may form several cations—each with a different charge. Fe 2 O 3 is made of Fe 3+ ions, so it is named iron(III)oxide. FeO is made of Fe 2+ ions, so it is named iron(II) oxide.

5. The Structure of MatterSection 3 Naming Ionic Compounds, continued To determine the charge of a transition metal cation, look at the total charge of the compound. –Fe 2 O 3 The total charge of the compound is zero. The iron ion has a charge of 3+. An oxide ion, O 2–, has a a charge of 2–. Fe 2 O 3 : (2 × 3+) + (3 × 2–) = 0

6. The Structure of MatterSection 3 Common Ionic Charges

7. The Structure of MatterSection 3 Math Skills Writing Ionic Formulas What is the chemical formula for aluminum fluoride? 1. List the symbols for each ion. Symbol for an aluminum ion: Al 3+ Symbol for a fluoride ion: F – 2. Write the symbols for the ions, with the cation first. Al 3+ F –

8. The Structure of MatterSection 3 3. Cross over the charges into subscripts and reduce by common factors. Al 1 F 3 4. Write the chemical formula. Show with subscripts how many of each ion are needed to make a neutral compound. Math Skills, continued AlF 3

9. The Structure of MatterSection 3 Practice 〉 Name the following compounds: 1.NaCl 2.Cs 2 O 3.Mg 3 N 2 〉 Write the formulas for the following compounds: 1.Molybdenum sulfide 2.Calcium Bromide

10. The Structure of MatterSection 3 Practice 〉 Name the following compounds: 1.NaCl- sodium chloride 2.Cs 2 O- caesium oxide 3.Mg 3 N 2 - Magnesium nitride 〉 Write the formulas for the following compounds: 1.Molybdenum sulfide - MoS 2.Calcium Bromide – CaBr 2

11. The Structure of MatterSection 3 Naming Covalent Compounds 〉 What do the numerical prefixes used in naming covalent compounds tell you? 〉 For covalent compounds of two elements, numerical prefixes tell how many atoms of each element are in the molecule. Numerical prefixes are used to name covalent compounds of two elements.

12. The Structure of MatterSection 3 Naming Covalent Compounds, continued Examples: –Boron trifluoride, BF 3 contains one boron atom and three fluorine atoms. –Dinitrogen tetroxide, N 2 O 4, is made of two nitrogen atoms and four oxygen atoms.

13. The Structure of MatterSection 3 Visual Concept: Naming Compounds Using Numerical Prefixes

14. The Structure of MatterSection 3 HW: 〉 P. 196 # 1-3, 5. Due tomorrow.