Warm up 10-19-15

1. Covalent bonds are between _____ and _____ elements

2. Ionic bonds are between _____ and _____ elements

3. Identify if these compounds are ionic or covalent: FeS, CO2, Cl2 and AlBr3

Agenda-Notes Unit 4-3-Lab Chemical Bonds

HomeworkOct 23 - Quiz Unit 4Oct 24 - Saturday SchoolOct 27 - Xtra Credit

Formulas and Names of Ionic and Covalent

Compounds

Unit 4-3

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 compound2. 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 CompoundsPractice

Chemical Formula Name1. CO2. P2S5

3. SiO2

4. SCl4

5. Trinitrogen pentabromide6. Dinitrogen trioxide7. Why incorrect? Monosulfur dioxide

Naming Ionic Compounds1. Ending element change to –ide. (no prefixes)2. Make sure all the charge cancel each other out3. 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)

ExamplesFor rule #1 and #2

1. CaCl2

2. MgI2

3. Potassium Sulfide4. Beryllium Fluoride

Practice

• MgCl2

• Ca2P3

• Potassium sulfide• Barium nitride

Use the toothpick to stir.

Unit 4 Quiz TopicsOct 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:1. Obtain the chemicals (1 scoop) each2. Set up the apparatus and label your aluminum

foil 3. Put the chemicals on top of the aluminum foil

and apply heat to it4. Record the order that each compound melt5. 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