Is Matter Around Us Pure?
Matter around us can be classified into two types: pure substances and mixtures. Pure substances are further divided into elements and compounds, while mixtures are a combination of two or more substances that are not chemically bonded.

Objectives of Pure Substances
Pure substances have definite chemical compositions and properties. This means that they have specific characteristics that distinguish them from other substances. These characteristics are consistent regardless of the source or location of the substance.

Characteristics of Pure Substances
- Pure substances have a fixed melting and boiling point.
- They exhibit specific chemical properties.
- They have a uniform composition throughout the substance.
- Pure substances cannot be separated into other substances by physical means.

Examples of Pure Substances
- Elements such as gold, iron, and oxygen are pure substances.
- Compounds like water (H2O) and table salt (NaCl) are also considered pure substances.

Mixtures vs. Pure Substances
Mixtures, on the other hand, do not have a fixed composition and can vary in properties depending on the proportions of the components present. They can be separated into their individual components through physical means like filtration, distillation, or chromatography.
In conclusion, matter around us consists of both pure substances and mixtures. Pure substances have specific characteristics and properties that make them distinct from mixtures. It is essential to understand the difference between pure substances and mixtures to study the behavior of matter in our surroundings.