An element is a pure substance that cannot be broken down into simpler substances by chemical means. Iced tea is not an element because it is composed of multiple substances, such as water, tea leaves, sugar, and ice.

A compound is a pure substance that is composed of two or more elements chemically combined in fixed proportions. Iced tea is not a compound because the proportions of its components can vary.

A mixture is a combination of two or more substances that are not chemically combined. Iced tea is a mixture because it is composed of multiple substances that are not chemically combined.