Agenda: Chemistry Review

• Chemistry Review: Bonding, Formulas & Names

• Types of Bonds – How do the valence electrons form bonds? – How do the non-bonding valence electrons impact

shape & polarity (VSEPR)• Making ionic formulas – Using polyatomic ions

• Names and Formula Booklet

Electronic cereal:

• Start with diatomic molecules – 2 atoms of the same element (7)

• Rules to follow: Make every compound1. Use different colors for each atom2. Show how each atom contributes electrons

to the bond and the lone pairs3. Determine shape & polarity

1. Polarity is?

Lewis structures show bonds & predict shape (VSEPR)

Ionic – Transfer of valence electrons • K and F• Be and O• Mg and Br

Covalent –Sharing of 2 valence electrons

• F₂• H₂0• NH₃• CH₄• O₂• N₂

Properties of Ionic Compounds

Structure: Crystalline solids (always)

Hardness Hard (like rocks)

Melting point: High

Boiling Point: High

Electrical Conductivity:

No : if solidYes: if melted or dissolved

Solubility in water:

Generally soluble

Properties of Covalent Compounds (molecules)

Structure Gas, Liquid or “soft” solidHardness Low Melting point Low to mediumBoiling Point Low to mediumElectrical conductivity NoSoluble in water Only if polar covalent

compound

Properties of Metallic Solids

Structure SolidHardness Medium (malleable,

ductile)

Melting point Medium to highBoiling point Medium to highElectrical conductivity YesSoluble in water No

Opposites Attract

• Find ions that can bond• Write the symbol and the charge• Write the new compound formed by

combining the ions.• Name the compound.• Write at least 15 compounds. – Ten should include subscripts.

Names & Formula Booklet

• Student created!• Where formulas did not copy properly: • Page 1 Ionic Bonds• AlBr₃; Li₂S; KCl, BaO, CaS, Li₃N, MgI₂,

Na₃P• Page 5 Covalent bonds• I₃N; S₂O, CBr₄, SiO₂