Chemical bond

Chapter 8: Molecules and Materials Section 8.2: Condensed Phases--Solids Monday, October 13, 2014 1:00 PM Arrangements of Solids: ? Crystalline solid - solids with regular, repeating geometric arrangements of atoms, ions, or molecules Amorphous solids - noncrystalline solid with random arrangement of atoms or molecules ? **crystalline solids are more common and well-known ? Arrangements can be thought of as packing marbles together in a box (especially since atoms are spherical) We can reduce space between atoms--but not eliminate it--by rearranging the atoms in the structure "packing efficiency" - percentage of total volume that is actually occupied by atoms in a crystal lattice Affected by density of the material ? ? ? Types of Structures ? ? Cubic Crystal lattices: ? ? ?

Chapter 2: Atoms and Molecules Section 1: Insight into Polymers Wednesday, August 27, 2014 12:40 PM What is a polymer? -substance consisting of many large particles (called momoners) -monomers are small molecules made of many atoms ? note: the composition of the monomers determines the properties of the polymer ? All polymers have a polymer backbone, which is a long string of atoms keeping the molecule together. In organic chemistry, the backbone is made of carbon molecules! ? ? ? THE DIFFERENT COMBOS OF ATOMS MAKE DIFFERENT POLYMERS! ? ? ? ? Coulomb's Law describes interaction of charged particles. ? (remember the E is the permittivity constant) ? ? ? ? ?