CHEM 121 Lecture Notes - Lecture 1: Dimensional Analysis, Carbon-12, Unified Atomic Mass Unit
Document Summary
The study of matter and the changes it undergoes. Matter is anything that has mass and takes up space. Matter can be pure or mixed, a liquid solid or gas combined into the basics . Chapter 0- chemical tools < > chapter 1- atoms what is chemistry? a compound is a pure substance composed of two or more elements chemically united in fixed proportions. Chemical means must be used to break a compound into its elements. In order to isolate; most people used heat, now we use electricity an element cannot be separated into simple substances by chemical means a tomos : without section. 118 elements identified element names have a variety of modern and ancient roots colors places people element symbol are derived from names, but not always common name. He put them on notecards and gave them order by mass from left to right increasing as you go across and down.
