CHEM 101 Lecture Notes - Reagent, Opendocument
Document Summary
At the molecular level, things are still happening. But rate of the forward reaction equals the rate of the reverse reaction. The overall combinations of the chemicals do not change. Charges must balance as well as atoms, aka we need to account for the electrons (must be same on both sides) atoms have lots of electrons, so easier to count the positive changes (missing electrons). Every molecule of compound has a fixed atomic composition. A mixture is more than one compound and so can have a variety of compositions depending on the compounds. Elements can be mixed, even in the solid (may need a liquid). Mixtures can be homogenous (does not appear to vary in space) or heterogeneous (varies throughout the material). Related to the numbers of the molecules of each different compound, and to the numbers of the atoms of each element is commonly determined by weighing. Devices are caliberated for use on the surface of planet earth.
