Question

Classify the following substances as a pure substance or a mixture

Answer 1

Pure substances have a constant composition and properties throughout, while mixtures can be either homogeneous or heterogeneous. Salt, pure water, salt water, pure air, and bronze are all homogeneous mixtures. Soil is a heterogeneous mixture. Carbon dioxide is a compound and gold is an element.

Step-by-step explanation:

Matter can be classified into two broad categories: pure substances and mixtures. A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Elements and compounds are both examples of pure substances. Compounds are substances that are made up of more than one type of atom. Elements are the simplest substances made up of only one type of atom.

1. Salt: Homogeneous mixture
2. Pure water: Homogeneous mixture
3. Soil: Heterogeneous mixture
4. Salt water: Homogeneous mixture
5. Pure air: Homogeneous mixture
6. Carbon dioxide: Compound (pure substance)
7. Gold: Element (pure substance)
8. Bronze: Homogeneous mixture