CHEM 177 Chapter 1.2: Chemistry 177 Chapter 1.2 (part one)
6 Jan 2018
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1. 2 classification of matter: physical state whether it is a gas, liquid, or solid, composition--whether it is an element, a compound, or a mixture. States of matter: matter can be a gas, liquid, or a solid. Gas (vapor): has no fixed volume or shape (but uniformly fills container) --can be compressed to occupy smaller volume, or it can expand to occupy larger one. Liquid: has distinct volume independent of container and assumes shape of portion of container it occupies. Solid: has both definite shape and definite volume. Neither liquid nor solid can be compressed to any appreciable extent. The properties of states of matter can be understood on the molecular level. In gas: molecules are far apart and moving high speeds, colliding repeatedly with one another and walls of container. Compressing a gas decreases space between molecules and increases frequency of collisions does not alter size/shape molecules. In liquid: molecules packed closely together but move rapidly.
