Elements, Compounds, and Mixtures .

Vocabulary flashcards covering the classification of matter, including elements, compounds, mixtures, and chemical symbol rules based on the lecture notes.

Pure Substance

A primary category of matter consisting of elements and compounds.

Element

A substance that contains only one type of atom and cannot be broken down physically, chemically, or at all (e.g., helium, oxygen).

Compound

A substance consisting of two or more types of different atoms chemically combined and bonded, which can only be broken down through a chemical reaction (e.g., $H_2O$).

Mixture

A combination of two or more pure substances combined physically together that do not have a set ratio or combination (e.g., trail mix, salt water).

Homogenous mixture

A mixture that looks to be one thing, also called a solution (e.g., salt water).

Heterogeneous mixture

A mixture that looks to be in different separate parts (e.g., trail mix).

Atom Symbols

One- or two-letter symbols used to name atoms, written as a single capital letter (e.g., $C$ for carbon) or a capital letter followed by a lowercase letter (e.g., $Ca$ for calcium).