9/18/09
Post date: Sep 17, 2009 10:14:26 PM
Bell activity: Why do we have 3 different ways to model a compound?
Folders Due
Bonds can bend, stretch, and rotate without breaking.
Atoms are constantly in motion, vibrating and spinning around, but this does not break the bond
We usually show a bond with a solid line, but it really behaves more like a flexible spring
The chemical structure of a compound determines its properties
Network structures
Repeating patterns of atoms - demo with students as atoms
Some networks are made of ions
Each atom is attracted to all the atoms around it
Very strong structures with high boiling and melting points
Molecules
Molecules are strongly bonded atoms
Each molecule is attracted to others around it, but not nearly as strong of an attraction.
Strength of attractions between molecules varies
Properties determined by chemical structure
Melting point and boiling point
Hardness
Compound Models Assignment (due Monday)
Section 1 Review due Monday
Page 182: 1-6