First, let's cover the basics. A pure substance is made from only one compound or just one element with no other substances mixed in. Hold up those two glasses, Katie. Imagine the pompoms ...

Compounds are made from two or more elements that are chemically bonded together. Compounds are a second type of pure substance. Compounds always have the same ratio of elements. For example, Pyrite ...

A compound is a pure substance that is made from more than one element. In a compound, elements are chemically bonded together, which makes it very difficult to separate them. Compounds are not ...

A compound is a pure substance composed of two or more different elements that are chemically combined in fixed proportions. Compounds have properties different from their constituent elements.