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 ...

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 ...