Distinguishing Mixtures and Compounds

The core difference between a mixture and a compound lies in their composition and how they can be separated.

Separation Methods

• Mixtures are formed when two or more substances are physically combined but do not chemically react. Their components retain their individual properties and can be separated using physical methods (e.g., filtration, evaporation, distillation, magnetism).
• Compounds are formed when elements chemically combine in a fixed ratio. This chemical bonding creates a new substance with properties different from its constituent elements. Compounds can only be broken down into simpler substances by chemical methods (e.g., electrolysis, heating).

Analysis of Options

• Option 1 is incorrect. Compounds are typically homogeneous, while mixtures can be homogeneous or heterogeneous.
• Option 3 is incorrect. In compounds, the elements chemically combine, and the resulting compound has new properties, different from the individual components.
• Option 4 is incorrect. Mixtures, especially non-homogeneous ones, often do not have a fixed boiling point; they may boil over a range of temperatures. Pure compounds have fixed boiling points.

Therefore, the method of separation (physical for mixtures, chemical for compounds) is the most accurate differentiator.