ISCI 2002 Lecture 3: Chapter 12
Document Summary
Law of conservation of matter: no detectable change in total mass occurs during a chemical reaction, a candle burned in air tight container of oxygen there is no change in mass. Definite proportions: when a compound is broken down, its elements are found in a definite proportion by mass, when the same compound is formed, the elements will combine in that same proportion by mass. Classical mechanics and quantum mechanics: quantum is small. Dalton"s atomic theory (1803: cornerstone of modern chemistry. Review: valence electrons are the ones involved in compound formation, 8a are noble gases and generally do not bond with other atoms (8 electrons in outer shell) Bonding: can get 8 in valence, transferring. One or more atoms lose their valence electrons. Formed due to loss or gain of electrons that destroy electrical neutrality of atom and produces positive or negative. Stock system: metals that from 2 ions, crcl2f = chromium (ii) chloride.
