1. CHEMISTRY January 8, 2015
CHEMICAL BONDS

2. Log onto www.coursesites.com 5 MINUTES
SCIENCE STARTER
Log onto
5 MINUTES

3. ANNOUNCEMENT
LAB ON MONDAY
FINAL EXAM ON JANUARY 16 AND 20
NO HOMEWORK ACCEPTED AFTER JANUARY 22, 2015

4. REVIEW
ELECTRONEGATIVITY DIFFERENCE - determine the type of bonding that may occur.
Usually, if the electronegativity between 2 atoms is less than 1.7 than the bond is a covalent bond.
Generally, if the electronegativity difference is greater than 2.0, then the bond is an ionic bond.

5. CHARACTERISTICS
3 MAJOR TYPES OF SUBSTANCES
IONIC
COVALENT
METALLIC

6. IONIC SUBSTANCE METALS AND NONMETALS GIANT STRUCTURES
ATOMIC RADIUS INCREASES OR DECREASES DEPENDING ON LOST OR GAIN OF ELECTRONS
HIGH MELTING AND BOILING POINTS
GOOD CONDUCTOR OF HEAT AND ELECTRICITY

7. COVALENT SUBSTANCES ALSO KNOWN AS MOLECULAR SUBSTANCES
STRONG INTRAMOLECULAR BONDS
WEAK INTERMOLECULAR BONDS
STATE OF MATTERS: GAS, LIQUID AND EASILY MELTED SOLID
DON’T DISSOLVE IN WATER (USUALLY)
DON’T CONDUCT ELECTRICITY

8. METALLIC SUBSTANCES SEA OF ELECTRONS
GOOD CONDUCTOR OF HEAT AND ELECTRICITY
MALLEABLE
FORM ALLOYS (METALS AND NONMTETALS)