Copper is classified as a pure substance. This means it consists of only one type of atom and has a consistent composition throughout its entirety.
To break it down:
- Pure Substance: A material that cannot be separated into simpler substances by physical means. Copper is an elemental metal, and it retains its properties regardless of the amount.
- Homogeneous Mixture: A mixture that has a uniform composition and appearance throughout. Examples include saltwater or air. Copper does not fit this category because it is not a mixture; it is a single element.
- Heterogeneous Mixture: A mixture in which the components can be easily distinguished. Examples include salad or sand. Copper, again, does not fit here, as it does not consist of different materials combined together.
In summary, copper is a pure substance due to its elemental nature. It does not exist as a mixture, and its properties remain constant regardless of the sample size or form.