Classifications of Matter

Substances vs Mixtures

This isn't a super-exciting topic, but it will be on your quiz, so listen up!

Solid vs Liquid vs Gas

In Chemistry class it's easy for teachers to get so bogged down in the details of whatever vocabulary-packed topic you happen to be studying that the "big picture" goes unnoticed: ultimately, everything in chemistry is about bouncy little magnets (atoms and molecules) either sticking together (solid) or rattling apart (liquid and gas).