CHE 201 Lecture Notes - Lecture 1: Decimal Mark, Round-Off Error, Scientific Notation
Document Summary
Chemistry: central science; understanding it can facilitate the understanding of other sciences, the study of matter and the changes it undergoes. Matter: anything with mass that occupies space, classification of matter, substance, form of matter with a constant composition and distinct properties, can be elements or compounds, elements, ca(cid:374)"t (cid:271)e separated into simpler substances by any chemical means (indivisible) Scientific measurements: quantitative properties: properties that can be measured; expressed using numbers, qualitative properties: properties that does not require measurements. Amount of substance meter kilogram second ampere kelvin mole m kg s. 1 kilometer (km) = 1 103 m. 1 millimeter (mm) = 1 10 3 m. 1 microliter ( l) = 1 10 6 l. 1 nanosecond (ns) = 1 10 9 s. 1 picogram (pg) = 1 10 12 g. Identity changes: after a chemical change, the original substance will no longer exist, extensive, depends on the amount of matter involved; additive, ex, mass and length.
