If a water electrolysis cell operates at a current of 7.8

Chemistry 111 Lecture Notes (Dr. Patton) Chapter 2: Atoms, molecules and ions 2.1- Atomic Theory  Atom  Derived from the Greek word atomos  Small indivisible particles  Daltons Atomic Theory  Contains 4 postulates (beliefs) 1. All matter is composed of atoms which are small indivisible particles of atoms 2. Elements are samples of matter composed of identical atoms which share the same size and chemical properties. One element has differing atoms compared to all other elements 3. Compounds are composed of two or more elements (Supports Law of Multiple Proportions and Law of Definite Proportions) 4. Atoms of an element can only be rearranged not created or destroyed. (Supports Law of Conservation of Mass)  His postulates led to further investigation of the atomic structure 2.2- The structure of the Atom  JJ Thomoson, Ernest Rutherford, and James Chadwick all helped prove that an atom is composed of subatomic particles. (Electron, Protons, and Neutrons)  JJ Thomson: Discovered electron (-)  Cathode Ray Tube  Electron mass: Approx. 9X10^-28g  Ernest Rutherford: Discovered proton (+)  Plum Pudding Model  James Chadwick: Discovered neutron (0, neutral/no charge)  Neutrons are located in nucleus  Summary of their findings  The volume of an atom is mainly empty space  Only protons and electrons have a charge  The mass of protons= the mass of neutr