Which jar contains a mixture?

The Nature of the Substances in the Jars

Solid Carbon: Solid carbon is an element in its solid state. This means that solid carbon consists of only one type of atom and is not a combination of different substances. Therefore, solid carbon is not a mixture.

Carbon Dioxide Gas: Carbon dioxide gas is a compound in its gaseous state. A compound is a substance composed of two or more elements chemically bonded together. In the case of carbon dioxide, it is made up of carbon and oxygen atoms bonded together. Therefore, carbon dioxide gas is not a mixture.

Liquid Copper: Liquid copper is an element in its liquid state. Like solid carbon, liquid copper consists of only one type of atom and is not a combination of different substances. Therefore, liquid copper is not a mixture.

Copper and Water: When copper is placed in water, it forms a mixture. Copper does not dissolve in water but remains as a separate solid substance within the water. This combination of copper and water is a physical mixture where two substances are physically mixed together but do not form a chemical bond. Therefore, the jar of copper and water contains a mixture based on the given data.