CH 101 Lecture Notes - Lecture 18: Relative Atomic Mass, Potential Energy, Diffraction

• School: University of Alabama
• Department: Chemistry
• Course: CH 101
• Professor: Diana Leung

Document Summary

Matter: anything that has mass and occupies space. Element: the most basic units of matter, unable to be broken down into smaller units through chemical means (things found on the periodic table) Atoms: the infinitesimally small building blocks of matter. Molecules: substances made up of two or more atoms joined together. Compounds: are molecules made up of two or more atoms of different elements bonded together. Gases: free to move; takes the shape of the container (can escape the container); not packed closely; compressible. Liquids: some freedom of motion; takes shape of the container (but does not escape the container); are packed closely; not compressible. Solids: no freedom of motion; rigid (does not take shape of container); particles packed very close together; cannot be compressed. Pure substance: a collection of matter in which all of the molecules are the same throughout. These molecules can either be made up of a single element or a single compound throughout.