Physical Properties of Ionic and Covalent Compounds

Sit in your assigned seat. DO NOT MOVE THE CHAIRS! Grab a Do Now ALSO, Grab 2 sheets of blank paper Start the do now QUIETLY!

(leave room for notes here) Physical Properties (leave room for notes here) Ionic Compounds Covalent Compounds Melting and Boiling Point Solubility Conductivity

Physical Properties Physical properties of substances are affected by the attractive forces between particles – Greater attraction between the molecules→ more energy is required to overcome the attractive forces between molecules Intermolecular forces in covalent compounds are weaker than interionic forces

Melting and Boiling Point Ionic Covalent High melting and boiling point Ionic compounds are solids at room temperature Lower Melting Points than ionic compounds Intermolecular Forces aren’t as strong as interionic forces Covalent compounds are liquids or gases at room temperature (H2O, CO2) Melting and Boiling Point

Ionic Solubility Covalent Many are soluble in water Ions separate when dissolved in water NaCl will dissolve in water and become freely moving Na+ and Cl- ions Will dissolve in liquids with similar molecular polarity “Like dissolves like” Polar dissolves in polar Non-polar dissolves in non-polar Polar and non-polar will not mix Oil and water do not mix because water is polar and oil is non-polar Solubility

Ionic Conductivity Covalent Ionic compounds dissolved in liquids are good conductors because the ions are separated. The ions need to be able to move freely in order to conduct electricity Solid ionic compounds are poor conductors because the ions are not separated and will not move Cannot conduct electricity as solid, liquid, or when dissolved Molecules will not separate into ions (electric current need charge carriers) Conductivity