We refer to methane gas, water, and sodium as substances. We can now characterize these substances into elements and compounds. Chemistry is the study of all of the “stuff” in the universe. In chemistry we refer to this “stuff” as matter. Recall, that matter is anything that has mass and occupies space. Flowers, trees, sand, water, methane gas, sodium, gold, people, DNA, air, are all examples of matter.

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Introduction to Elements and the Periodic Table
The Periodic Table and its Design
Common Groups of Elements
Compounds
Law of the Conservation of Mass
Laws of Definite and Multiple Proportions
Mixtures
Atomic Structure
Atomic Number, Isotopes, and Atomic Mass
Moles, Entities, and Mass
Nomenclature