What are compounds and mixtures?

Compounds and mixtures are indeed best described as combinations of matter. A compound is a substance formed when two or more elements are chemically bonded together in fixed proportions, resulting in unique properties that differ from the individual elements. For example, water is a compound made from hydrogen and oxygen. Mixtures, on the other hand, consist of two or more substances that are combined physically rather than chemically. The substances in a mixture retain their individual properties and can often be separated by physical means.

This understanding is foundational in chemistry and essential for esthetics, as it informs how different substances interact, especially in the formulation and application of skincare products. Recognizing the distinctions between mixtures and compounds helps estheticians understand the makeup of the products they use and advise clients effectively based on their specific skin types and needs.

The other choices do not accurately describe compounds or mixtures. Pure substances identify only those with a uniform and definite composition, while elements refer to substances that cannot be broken down into simpler forms. Single atoms are the smallest units of elements and do not encompass the broader concept of mixtures or compounds.