CHEM 18.1 Discussion Materials

Lewis StructuresPage 1

Covers the drawing of Lewis structures for ionic and covalent compounds, the octet rule and its exceptions (incomplete, expanded, and odd-electron species), resonance structures, and the calculation of formal charges to determine the most plausible structure.

Significant Figures and Unit ConversionsPage 9

Discusses rules for identifying significant figures in measurements, scientific notation, rounding numbers, and performing calculations with multiple operations. It also details the use of dimensional analysis for unit conversions and SI unit prefixes.

Formulas and NomenclaturePage 17

Explains naming conventions and chemical formula writing for binary covalent compounds, ionic compounds (main group and transition metals), polyatomic ions, hydrates, and various types of acids (binary and oxyacids).

Mole Concept, Concentrations, and Colligative PropertiesPage 25

Defines the mole and Avogadro's number for conversions between mass, moles, and particles. Details expressions of concentration (Molarity, Molality, Normality, percent compositions, ppm, ppb) and the principle of dilution. Includes the freezing point depression aspect of colligative properties.