Mixture
Two or more substances that are not chemically combined.
A mixture is a combination of two or more substances that are physically combined. The substances in a mixture retain their individual properties and can be separated by physical means such as filtration, distillation, or chromatography.
Mixtures can be homogeneous or heterogeneous. A homogeneous mixture is uniform throughout the mixture, meaning that all parts of the mixture have the same properties. Examples of homogeneous mixtures include saltwater and air. A heterogeneous mixture is not uniform throughout the mixture, meaning that different parts of the mixture have different properties. An example of a heterogeneous mixture is a salad with different types of vegetables in it.
Mixtures can also be classified as solutions, suspensions, or colloids. A solution is a homogeneous mixture in which the solute (the substance being dissolved) is evenly distributed throughout the solvent (the substance doing the dissolving) to form a single phase. Examples of solutions include saltwater and sugar water. A suspension is a heterogeneous mixture in which the particles of the solute are large enough to settle out and separate from the solvent over time. Examples of suspensions include muddy water and blood. A colloid is a heterogeneous mixture in which the particles of the solute are small enough to remain evenly dispersed throughout the solvent to form a single phase. Examples of colloids include milk and fog.
In summary, a mixture is a combination of two or more substances that can be separated by physical means. Mixtures can be homogeneous or heterogeneous, and can be classified as solutions, suspensions, or colloids based on the size and behavior of the particles in the mixture.
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