All of the examples you provided—pure aluminum foil, distilled water, NaCl (table salt), and a gold bar (pure Au)—can be classified as pure substances.
- Pure substances are materials that have a consistent composition and distinct properties throughout. They can be further divided into elements (like gold) and compounds (like distilled water and sodium chloride).
- Pure Aluminum Foil is an element.
- Distilled Water is a compound composed of hydrogen and oxygen.
- NaCl (Table Salt) is also a compound, comprised of sodium and chlorine.
- Gold Bar is an element.
Thus, they all fall under the category of pure substances.
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