Washington Esthetician State Board Practice Exam

A mixture is best defined as a physical combination of two or more substances. In a mixture, the individual components retain their separate identities and properties, meaning that they do not chemically combine as they would in a compound. This definition emphasizes that mixtures can be homogeneous, where the substances are evenly distributed, or heterogeneous, where the components are distinguishable.

In contrast, the other choices do not accurately represent a mixture. A chemical combination with a fixed ratio refers to compounds, which are formed through chemical reactions and have a specific, defined composition. A reaction between different states of matter is more indicative of a chemical change or process rather than the static state of a mixture. Lastly, a solution with no solute describes a situation where there is a solvent but no solute dissolved in it, which does not adequately capture the essence of a mixture. Thus, the definition of a mixture as a physical combination is the most accurate and comprehensive understanding of the term.