CHEM 1210 Lecture Notes - Lecture 1: Lead, Water Cycle, Significant Figures

• School: Ohio State University
• Department: Chemistry
• Course: CHEM 1210
• Professor: Shiyu Zhang

Document Summary

Beginning language: elements, molecules (eg: o, o2, h2o) Origin of chemistry: egyptian (cid:862)khemeia(cid:863) was a chemical process for preparing dead for burial and afterlife. 2400 years ago people were only aware of: fe, cu, ag, au, hg, c, sn, pb, s. 400 bc democratus: could matter be divided into smaller and smaller pieces forever: he described the early world as being composed of void ((cid:862)vacuum(cid:863)) and being ((cid:862)matter(cid:863)) Matter takes up space: being is composed of infinity of atoms, atoms from greek (cid:862)toui(cid:863, means cut or divisable, +a means not able (cid:862)not able to cut(cid:863) Aristotle 383 bc established idea of 4 essences: fire, water, earth, air. Compounds= 2 or more types of atoms. Substance= matter that has distinct properties that does not vary between samples and is one or more atoms. Mixture= more than 1 substance: homogenous or heterogenous. Examples: pure substance: ice, compound: water, mixture: air.