What makes pure substance different from mixture?

Question: What makes pure substance different from mixture?

Here’s a breakdown of the differences between pure substances and mixtures:

Pure Substances

Composition: Pure substances have a uniform and definite composition. They are made up of only one type of particle.

Examples: Elements (like gold, oxygen) and compounds (like water, sodium chloride).

Properties: They have consistent and unchanging properties. For instance, pure water always has the same boiling and freezing points.

Separation: Cannot be separated into other substances by physical methods.

Mixtures

Composition: Mixtures consist of two or more substances physically combined. The composition can vary.

Examples: Saltwater, air, salad.

Properties: The properties of mixtures depend on the proportions of the substances present. They can vary from one sample to another.

Separation: Can be separated into their individual components by physical methods like filtration, distillation, or magnetic separation.

In essence, a pure substance is always homogeneous (uniform throughout), while a mixture can be either homogeneous (like a solution) or heterogeneous (like a salad). This makes mixtures more versatile in everyday use, while pure substances are crucial for precise scientific applications.

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