Gain a better understanding of the properties and interaction between matter, energy, atoms, and molecules with Alison's free online Chemistry courses. Want to learn more about the periodic table of elements, electrochemistry, and food chemistry? Try one of our advanced chemistry classes, where you will also learn about the history and development of atomic theory. We also have training courses where you can learn the characteristics of each of the four states of matter and the amount of energy that can be added to or taken from a substance before it starts to change state. Get started, today!