AP Chemistry – Class 53

Dates

• Period E  – Friday, January 11th
• Period F – Friday, January 11th

Class Business

• Quiz (Chapter 9) will be on Tuesday

Big Idea: How do atoms arrange themselves in a compound?

Covalent Substances

• review homework problems
• new examples

Ionic Substances

• Alternating positive and negative = crystal lattice
• Lattice energy – very tightly bonded – higher charge = higher energy
• different types of arrangements
• Lewis short-hand drawing (with brackets)

Homework

• Textbook Ch. 9 (51, 63, 64, 65)
• Study for Quiz on Tuesday (will not included bond energies)
• Note – please review bond enthalpy for the next exam