PROPERTIES OF IONIC COMPOUNDS

IONIC COMPOUND

ONE WITH IONIC BONDSEx: NaCl

CuSO4

OBJECTIVE

After completing this presentation you should be able to:List and explain 4 properties of ionic compounds

List several people who care about each property and explain why they care

1) FORM CRYSTALS

CRYSTAL: A REGULAR GEOMETRIC PATTERN

WHO CARES?

A) GEOLOGISTSB) GEMOLOGISTS* COMPUTER CHIP DESIGNERS

WHY FORM CRYSTALS?

IONS WANT CLOSEST PACKING POSSIBLE

A PATTERN FORMS (THE PATTERN DEPENDS ON THE SIZE OF THE IONS)

2) HIGH MELTING POINT

TEMPERATURE REQUIRED TO CHANGE THE SOLID TO LIQUID

AVERAGES 1000 C

WHO CARES?

MATERIALS SCIENTISTSSPECIALTY CERAMICSPEOPLE WHO NEED HIGH MELTING POINT MATERIALS!!!

WHY HIGH MELTING POINT?

THE ELECTROSTATIC FORCE IS VERY STRONG

IT TAKES A LOT OF ENERGY TO BREAK THE FORCE TO ALLOW THE CRYSTAL TO MELT

3) DISSOLVE IN WATER

THEY’RE WATER SOLUBLE

WHO CARES?

FARMERSMEDICAL PROFESSIONALSATHLETES

WHY WATER SOLUBLE?

WATER IS POLARTHE IONS IN THE CRYSTAL ARE AS ATTRACTED TO THE WATER’S CHARGES AS TO OTHER IONS

THERE IS MORE WATER AND THE WATER MOVES MORE

4) THEY ARE ELECTROLYTES

ELECTROLYTE: CONDUCT ELECTRICITY WHEN DISSOLVED (OR MOLTEN)

WHO CARES?

MEDICAL PROFESSIONALSANYONE WHO WANTS TO BE HEALTHY

ELECTROLYTES

Na+: important to many systemsK+: respiratory systemCa+2 & Mg+2: large muscle groupsOthers include: Zn+2, Li+, I-

WHY ARE THEY ELECTROLYTES?

IONS WILL CONDUCT ELECTRICITY WHEN THEY CAN MOVE

WHEN DISSOLVED THEY ARE FREE TO MOVE AND CARRY THE ELECTRICAL CURRENT

WHEN SOLID THEY CAN’T MOVE THEREFORE THEY DON’T CONDUCT