Writing Formulas and Naming Compounds Binary Compounds Compounds that are made up of only 2 elements Two types of binary compounds: 1. Ionic Compounds metals and nonmetals (Ex: NaCl, MgBr2, K2O) 2. Covalent Compounds 2 nonmetals (Ex: CO2, H2O, SO3) Practice Ionic or Covalent? 1.
ionic Naming Covalent Compounds 1. Use prefixes to indicate the number of each element hexa 6 mono 1 hepta 7 di 2 octa 8 tri 3 nona 9 tetra 4
deca 10 penta 5 Naming Covalent Compounds 2. Name the first element. If you have only one atom of the first element, do NOT use the prefix mono-. 3. Name the second element with prefixes. Change the ending to -ide. Naming Covalent Compounds Practice 1. CO2
Writing Ionic Formulas Ionic compounds are composed of a positive ion called a cation and a negative ion called an anion. 1. Write the metal ion first ( + ion: cation) 2. Write the nonmetal last ( - ion: anion) 3. Balance the charges! Charges must add up to zero to form a neutral compound. Writing Ionic Formulas To determine the charge: You can look at the position of the element on the periodic table to determine the charge of the element when it forms
an ion There is a difference between a neutral element (K) and an ion (K+) Periodic Table Charges Writing Ionic Compound Formulas 1. sodium chloride Na+ Cl-
-2 +3 O Al O-2 Al2O3 Ionic Compounds with Roman Numerals The roman numeral gives the charge of the metal ion. Ex: Fe(II) Fe+2
Fe(III) Fe+3 Transition metals need roman numerals in the name. Pb and Sn need roman numerals because they have charges of +2 and +4. Ag and Zn do NOT need roman numerals because Ag is always +1 and Zn is always +2. Ionic Compounds with Roman Numerals Write the Formula 1. nickel (II) bromide NiBr2
2. lead (IV) oxide PbO2 3. iron (III) sulfide Fe2S3 Ionic Compounds with Roman Numerals Name the Following 1. CrCl3
2. FeO 3. SnCl4 chromium (III) chloride iron (II) oxide tin (IV) chloride copper (I) oxide 4. Cu2O Review: Write the Formula 1. strontium fluoride
4. Zn(C2H3O2)2 zinc acetate Naming Polyatomic Ions Practice: Write the Formula 1. aluminum nitrate Al(NO3)3 2. ammonium sulfite (NH4)2SO3
3. iron (III) chlorate Fe(ClO3)3 4. calcium phosphate Ca3(PO4)2 Review: Covalent compounds are made up of nonmetals only. Use prefixes in the names of covalent compounds. Covalent compounds do not have charges!
Ionic compounds are made up of a metal and a nonmetal. Balance the charges when you write a formula for ionic compounds. Never use prefixes in the names of ionic compounds!
Approximate More Examples Whose Base is Neither 10 nor e Use the Change of Base formula to make it either a natural log or common log and use the steps to graphing a log function. See page 320 for a...
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