Chemistry

Chapter 7: Chemical Bonding Section 7.3: The Covalent Bond Wednesday, October 1, 2014 1:55 PM Covalent bonds - attractive force resulting from the sharing of electrons between pairs of atoms ? Chemical Bonds and Energy ? Driving force between all bond formation is lowering overall energy (NOTE: attractive interactions lower potential energy) ? Typically in interactions between nonmetals! ? -point of minimum energy in a system = formation of covalent bond Bond energy - energy released when isolated atoms form a covalent bond Bond length - distance between the nuclei of bonded atoms ? Formation of a chemical bond always releases energy Bond strength is determined by the amount of energy released in the formation of that bond (more released energy means stronger bond) ?

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) ? ? ? ? ?