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

Key Concepts

Pure Substances

A pure substance consists of a single type of particle and has a uniform and definite composition. Examples include elements like oxygen and compounds like water. Pure substances have consistent properties throughout, such as boiling and melting points, which distinguish them from mixtures.

Mixtures

A mixture contains two or more different substances that are physically combined but not chemically bonded. Mixtures can be classified as homogeneous, where the components are evenly distributed (like saltwater), or heterogeneous, where the components remain distinct (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 throughout, meaning that the individual components are not distinguishable. In contrast, heterogeneous mixtures consist of visibly different substances or phases, allowing for the identification of individual components. Understanding this distinction is crucial for classifying mixtures accurately.