CHEMISTRY January 8, 2015 CHEMICAL BONDS.

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Presentation transcript:

CHEMISTRY January 8, 2015 CHEMICAL BONDS

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

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)