Chemical reactions QOD: Guess how you would write the symbols for the following: potassium chloride carbon monoxide Hint: sodium chloride = NaCl

How do we name compounds?

Classifying Compounds Is there a metal or a polyatomic ion present? If the answer is yes, use the system for naming ionic compounds. If the answer is no, use the system for naming covalent compounds.

Ionic compounds Ex: NaCl  Ex: H3OCl #5.1 Aim: How do we name compounds? Agenda QOD (5) Lesson: Naming compounds (15) Activity: translating (15) Closing (5) HW #44 Ionic compounds positive ion + negative ion – “ide” Ex: NaCl  “sodium chloride” Same rules for polyatomic ions (use Table E) Ex: H3OCl “hydronium chloride” How would you write MgF2? What is the symbol for sulfur cyanide?

Naming Ionic Compounds: Examples Na2SO4 sodium sulfate C2H3O21- acetate CO32- carbonate HCO31- bicarbonate NH41+ ammonium NO31- nitrate OH1- hydroxide PO43- phosphate SO42- sulfate * Groups I & II, Al, Zn, Cd, and Ag need no Roman numeral. Fe(NO3)2 iron (II) nitrate AlCl3 aluminum chloride PbI4 lead (IV) iodide (NH4)3PO4 ammonium phosphate Mg3N2 magnesium nitride AgC2H3O2 silver acetate

CaCl2   K2CrO4 B2Si FeN Li3N CF4   Na2O NH4Cl

SOCCR (symbol, oxidation, criss-cross, reduce) Writing Formulas SOCCR (symbol, oxidation, criss-cross, reduce) Mg+2Br-1 MgBr2 This is just a ratio, so you can’t have a negative number of atoms. Ones aren’t written. CaO (the two’s reduce to one!) Ca+2O-2

strontium nitrate    lithium sulfate hydrogen gas sodium peroxide potassium phosphate potassium chromate calcium oxide cesium bromide

Naming Ionic Compounds There are, however, a complicating factor: I. Some metals form more than one ion. (multivalent) I. Metals that form more than one ion, such as iron, add a Roman numeral to the name to indicate the charge: Fe2+ is called iron (II) and Fe3+ is called iron (III) Assume a Roman numeral is required for any metal except 1. metals in groups IA and IIA on the periodic table 2. aluminum, cadmium, silver, and zinc

Naming Ionic Compounds (continued) If a Roman numeral is required, the charge on the metal ion must be determined from the charge on the negative ion. Helpful Rules to Remember A metal ion is always positive. The Roman numeral indicates the charge, not the subscript. The positive and negative charges must cancel (total charge must = 0). Nonmetals are always negative & can never form more than one monatomic ion. Examples Formula Reasoning Name FeCl2 Cl has a 1- charge, and there are 2 of them for a total of 2-, so the Fe must be 2+ iron (II) chloride Fe2O3 O has a 2- charge, and there are 3 of them for a total of 6-, so the Fe must have a total charge of 6+ split equally between the two iron atoms, so each must have a 3+ charge iron (III) oxide PbS2 S has a 2- charge, and there are 2 of them for a total of 4-, so the Pb must be 4+ lead (IV) sulfide Cu3N N has a 3- charge, so the Cu must have a total charge of 3+ split equally between the 3 copper atoms, so each must have a 1+ charge copper (I) nitride

Silver (III) Nitride ____________________________ Vanadium (III) Chloride __________________________ Lead (IV) oxide ____________________________ Pb Br4__________________________ Pb3 N2__________________________ Cu2 S___________________________

The tricky thing about ionic compounds #5.1 Aim: How do we name compounds? Agenda QOD (5) Lesson: Naming compounds (15) Activity: translating (15) Closing (5) HW #44 The tricky thing about ionic compounds How do we know how many atoms there are since there are no prefixes? Ex: calcium bromide  CaBr?? Use the charge! (make it equal zero) What is the symbol for magnesium iodide?

Molecules For compounds with _______________ bonds: Ex: CO  #5.1 Aim: How do we name compounds? Agenda QOD (5) Lesson: Naming compounds (15) Activity: translating (15) Closing (5) HW #44 Molecules For compounds with _______________ bonds: Prefix— lower electronegativity atom + prefix— higher electronegativity atom – “ide” Ex: CO  carbon monoxide How would you write CO2? What is the symbol for dioxygen diflouride?

Can you translate these…? #5.1 Aim: How do we name compounds? Agenda QOD (5) Lesson: Naming compounds (15) Activity: translating (15) Closing (5) HW #44 Can you translate these…? 1. Sulfur trioxide 3. hydronium chloride 2. N2Cl2 4. Magnesium bromide

Naming compounds practice

Closing How do we name this compound? LiNO3