Warm up 10-19-15 Covalent bonds are between _____ and _____ elements Ionic bonds are between _____ and _____ elements Identify if these compounds are ionic or covalent: FeS, CO2, Cl2 and AlBr3 Agenda -Notes Unit 4-3 -Lab Chemical Bonds Homework Oct 23 - Quiz Unit 4 Oct 24 - Saturday School Oct 27 - Xtra Credit

Formulas and Names of Ionic and Covalent Compounds Unit 4-3 Formulas and Names of Ionic and Covalent Compounds

Nomenclature: Naming of Compounds Must determine which bond made up the compound Ionic bond has metal elements Covalent bond has no metal elements

Naming Covalent (Molecular) Compounds 1. Use a prefix to indicate the amount of each element in the compound 2. Never use mono– on the first element name. 3. Give the last element an –ide ending.

Naming Covalent (Molecular) Compounds Mono– 1 Di– 2 Tri– 3 Tetra– 4 Penta– 5 Hexa– 6 Hepta– 7 Octa– 8 Nona– 9 Deca– 10 Prefixes

Examples CO2 B2H4 Dinitrogen trioxide

Naming Covalent Compounds Practice Chemical Formula Name 1. CO 2. P2S5 3. SiO2 4. SCl4 5. Trinitrogen pentabromide 6. Dinitrogen trioxide 7. Why incorrect? Monosulfur dioxide Carbon Monoxide, diphosphorus pentasulfide, Silicon dioxide, sulfur tetrachloride, N3Cl5,

Naming Ionic Compounds 1. Ending element change to –ide. (no prefixes) 2. Make sure all the charge cancel each other out 3. If there is a transition metal you indicate the charge with a roman numeral after the name of the metal. 4. If it is a polyatomic ion, you simply use the name as it is. (no –ide)

Examples For rule #1 and #2 CaCl2 MgI2 Potassium Sulfide Beryllium Fluoride

Practice MgCl2 Ca2P3 Potassium sulfide Barium nitride Use the toothpick to stir.

Unit 4 Quiz Topics Oct 23 2 questions - Finding Ions (positive and negative charge) 2 questions - Bonds (3 types) 2 questions - Naming compounds

Bond Identification lab Objectives: Classify compounds as having ionic or covalent bond based on its physical property: solubility, melting point and conductivity Procedure: Obtain the chemicals (1 scoop) each Set up the apparatus and label your aluminum foil Put the chemicals on top of the aluminum foil and apply heat to it Record the order that each compound melt Dissolve the chemicals in water and ethanol

Clean Up Procedures Aluminum foil and compounds from the plates go in the trash Rinse your plates

Reminders Lab due next class Notes summary Oct 23 - SEAP summer program deadline Oct 24 - Chemistry Saturday school

More Examples Mixture of covalent, ionic and polyatomic nomenclature.

SrS Strontium Sulfide

GaCl3 Gallium Chloride

Ammonium NH4+

Calcium Oxide CaO

Sulfate SO42-

Phosphate PO43-

Strontium Nitride Sr3N2

Li3N Lithium Nitride

Hydroxide OH-

Beryllium Carbonate BeCO3

BeSe Beryllium Selenide

Mg(NO3)2 Magnesium Nitrate

KBr Potassium Bromide

AlPO4 Aluminum Phosphate

Magnesium Arsenide Mg3As2

NaOH Sodium Hydroxide

Potassium Sulfate K2SO4

Ba2P3 Barium Phosphide

Rubidium Phosphide Rb3P

Potassium Chloride KCl

Sodium Oxide Na2O

Rb2O Rubidium Oxide