Which term describes a pure substance that is made up of only one type of atom?

Based on the given information, what is the best classification for this sample of crude oil?

What is the basic form of matter that cannot be broken down any further?

Which solution is a homogeneous mixture: sand and water, salt and water, salad dressing, or soil?

In the following images, the white spheres represent hydrogen atoms and the red spheres represent oxygen atoms. classify each sample as an element, a compound, or a mixture.

What is the correct classification of a mixture in which both a solid and a liquid are visible?