Significant Figures | Scientific Notation | Dimensional Analysis | Avogadro’s number | Balancing equations | Limiting Reactant | Molarity | Dilutions
The FULL ebook - the one you access through MasteringChemistry - also covers all this background, mostly in Chapters 1-4.
Tutorials that may help you with specific labs:
Lab #6: Phase Diagrams
The drop-in center on the Elliott landing is a good place to go for help with labs.