These videos are part of a complete course series designed for Allied Health Students at Sacramento City College – SCC. You can find copies of the accompanying lecture outlines at https://chemwiki.ucdavis.edu/Wikitexts/Sacramento_City_College/SCC%3A_Chem_309
These videos were filmed in 1-take, so there are a few errors throughout the series (less than 1%). You can find the corrections in the lecture outlines that also available at the link above.
If you need closed captioning, then use the link from the site above or directly at the SCC website at https://www.scc.losrios.edu/online/course-videos/chemistry-tutorial-videos-allied-health-series/