Final answer:
Chemistry involves classifying matter into pure substances and mixtures. Pure substances have uniform composition and properties, such as elements and compounds, while mixtures consist of two or more substances and can be homogeneous or heterogeneous.
Step-by-step explanation:
Understanding Pure Substances and Mixtures
An important concept in chemistry is the classification of matter into pure substances and mixtures. A pure substance has a constant composition and uniform properties throughout the sample. Examples of pure substances include elements like gold and compounds such as silicon dioxide. In contrast, a mixture consists of two or more substances that are not chemically combined, such as salt water or air, and can be either homogeneous or heterogeneous in nature.
Examples of Substances and Mixtures
Compound: Water (H2O)
Element: Oxygen (O2)
Homogeneous Mixture: Air (a mixture of gases)
Heterogeneous Mixture: Soil (a mixture of organic and inorganic components)
Additionally, a term such as 'material' can refer to a type of substance or mixture with specific applications, like wood or plastic. Understanding this hierarchy from general to simple is crucial in chemistry when studying the properties and interactions of matter.