Do Now & Announcements Turn in lab from yesterday

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Presentation transcript:

Do Now & Announcements Turn in lab from yesterday Work on “Vapor Pressure Review” Today: Intermolecular Forces, Properties of Matter continued. Unit 3 Review Unit 3 Extra Credit Quiz TOMORROW

exothermic: release heat Endothermic: require heat boiling condensation sublimation deposition melting freezing

3. Intermolecular Forces Forces of attraction between molecules (dotted lines represents attraction between molecules)

Moving quickly, bouncing flowing Tightly packed Loose, but close Spread far apart Moving quickly, bouncing Slow, vibrating in place flowing Definite volume Definite volume Volume can change Definite shape Shape can change Shape can change

Intermolecular Forces & Phase of Matter For the same chemical substance, molecules in the SOLID phase will have stronger intermolecular forces between them than molecules in the GAS phase In order for a solid to change into a liquid (melt) or for a liquid to change into a gas (boil), the molecules must overcome the intermolecular forces holding them together.

Covalent (Molecular) Compounds Properties of Solids Ionic Compounds Covalent (Molecular) Compounds Metals Made up of…   Electrons are…. Physical Properties: ________ melting point & boiling point Solids ______________ conduct electricity When dissolved in water: _______ conduct electricity Solids _____________ conduct electricity When dissolved in water: _____ conduct electricity _______ melting point & boiling point Solids _____ conduct electricity

Ionic Compounds Metal + Nonmetal Electrons are transferred HIGH melting point & HIGH boiling point Solids DO NOT conduct electricity Ionic compounds dissolved in water DO conduct electricity (electrolytes)

Covalent Compounds 2 or more Nonmetals Electrons are shared LOW melting point & LOW boiling point Solids DO NOT conduct electricity Covalent compounds dissolved in water DO NOT conduct electricity (nonelectrolytes)

Metals Made up several atoms of the same metal Electrons are constantly moving HIGH melting point and HIGH boiling point Solids DO conduct electricity

Note Metals are found to the left of the “staircase” on the periodic table Nonmetals are found to the right of the “staircase” on the periodic table

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