Post on 06-Jan-2016
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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