What is a homogeneous mixture?

What is a homogeneous mixture?

• A. A mixture that appears uniform throughout, with consistent composition at the atomic and molecular level.
• B. A mixture where the components are visibly distinct.
• C. A substance with only one type of molecule.
• D. A mixture that cannot be separated into any components.

Answer: (A)

A homogeneous mixture has uniform composition throughout, so any sample has the same ratio of components at the atomic and molecular level. This is why a salt–water solution or air looks uniform through the entire substance. If the components are visibly distinct, it’s a heterogeneous mixture, not homogeneous. A substance with only one type of molecule is a pure substance, not a mixture. And a mixture that cannot be separated into any components isn’t really a mixture—most homogeneous mixtures can be separated by physical methods like evaporation or distillation.

A homogeneous mixture has uniform composition throughout, so any sample has the same ratio of components at the atomic and molecular level. This is why a salt–water solution or air looks uniform through the entire substance. If the components are visibly distinct, it’s a heterogeneous mixture, not homogeneous. A substance with only one type of molecule is a pure substance, not a mixture. And a mixture that cannot be separated into any components isn’t really a mixture—most homogeneous mixtures can be separated by physical methods like evaporation or distillation.