CHEMISTRY January 8, 2015 CHEMICAL BONDS
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ANNOUNCEMENT LAB ON MONDAY FINAL EXAM ON JANUARY 16 AND 20 NO HOMEWORK ACCEPTED AFTER JANUARY 22, 2015
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.
CHARACTERISTICS 3 MAJOR TYPES OF SUBSTANCES IONIC COVALENT METALLIC
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
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
METALLIC SUBSTANCES SEA OF ELECTRONS GOOD CONDUCTOR OF HEAT AND ELECTRICITY MALLEABLE FORM ALLOYS (METALS AND NONMTETALS)