Question

If it represents a pure substance, classify the substance as an element or a compound. If it represents a mixture, classify the mixture as homogeneous or heterogeneous.

Answer 1

A pure substance is either an element or a compound, while mixtures are either homogeneous or heterogeneous. Salt, pure water, and carbon dioxide are compounds. Soil is a heterogeneous mixture, and salt water and pure air are homogeneous mixtures. Gold is an element, and bronze is a homogeneous mixture.

Step-by-step explanation:

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, while elements are the simplest substances made up of only one type of atom.

Mixtures, on the other hand, are physical combinations of two or more elements and/or compounds. They can be classified as homogeneous or heterogeneous. Homogeneous mixtures have a uniform composition throughout, whereas heterogeneous mixtures have non-uniform composition.

Now, let's classify the given substances:

1. Salt - compound
2. Pure water - compound
3. Soil - heterogeneous mixture
4. Salt water - homogeneous mixture
5. Pure air - homogeneous mixture
6. Carbon dioxide - compound
7. Gold - element
8. Bronze - homogeneous mixture