Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (c) a hardboiled egg

Key Concepts

Pure Substances

A pure substance consists of a single type of particle and has a uniform composition throughout. Examples include elements like oxygen and compounds like water. Pure substances have consistent properties such as boiling and melting points, which do not vary regardless of the sample size.

Mixtures

Mixtures are combinations of two or more substances that retain their individual properties. They can be classified as homogeneous, where the components are evenly distributed (like saltwater), or heterogeneous, where the components are not uniformly distributed (like a salad). The properties of mixtures can vary depending on the proportions of their components.

Homogeneous vs. Heterogeneous Mixtures

Homogeneous mixtures have a uniform composition and appearance throughout, making it difficult to distinguish the individual components. In contrast, heterogeneous mixtures contain visibly different substances or phases, allowing for easy identification of the separate components. The classification of a mixture as homogeneous or heterogeneous is crucial for understanding its physical properties and behavior.