Are all physical changes accompanied by chemical changes? Are all chemical changes accompanied by physical changes? Explain.
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