Opnestax appendix about chemistry: https://openstax.org/books/microbiology/pages/a-fundamentals-of-physics-and-chemistry-important-to-microbiology

NaCl bonding song: https://youtu.be/ljvX-RMv_lw?si=yoV6RwhIjlWI3aBn

TEAS test prep chemistry video: https://youtu.be/j9rLiSLIsh4?si=4Gl9FmiVBAywprGo

Same TEAS series but with chemistry questions: https://youtu.be/B3_nogbF8ZM?si=j4qsi_O5Ap5dSWND