Read through chapter 14 in your book. Note that we skipped the entirety of unit 2, I consider all of that chemistry, that does mean that there may be concepts that unit 3 takes for granted that you know, say, about the structure of atoms, states of matter, what is pressure, etc. in this spot, write any questions you have on the reading, and any part of unit 2 that you think you would like me to go into any depth on.