Question

unit 1 test: matter (2025) quiz instructions started sep 4 at 1:07pm instructions for each test item, identify the choice that best completes the statement or answers the question. question 3 3 pts which is an example of a pure substance? milk peanut air gold

Explanation:

A pure substance has a definite and constant composition. Gold is a pure element. Air is a mixture of gases, peanut is a complex organic material with multiple components, and milk is a mixture of water, fats, proteins etc.

Answer:

Gold