Learner Reviews & Feedback for Introduction to Chemistry: Reactions and Ratios by Duke University
About the Course
Top reviews
SP
Nov 26, 2021
I find it very clearly presented and well organized. I really enjoyed it. Thank you! I liked it so much that I decided to translate it in my mother language so I can refresh the notions learned.
NM
Sep 13, 2025
Excellent course!!! I enjoyed the historical background the lecturer used including the brief synopsis of the Chinese emperor consuming mercury pills to gain immortality.
326 - 336 of 336 Reviews for Introduction to Chemistry: Reactions and Ratios
By Nafiul A
•Jun 17, 2020
I loved this course
By Eb E
•Nov 12, 2019
Cool class!
By Sara b
•Nov 6, 2024
Good work
By Nicholas F
•Sep 18, 2022
good
By PERI S R K
•Jul 26, 2025
Good
By Nancy L
•May 1, 2021
I've found easier tutorials on YouTube for certain subjects but I really enjoyed the demos!
By Moosa K
•Jun 29, 2025
Informative and helpful for beginners as well as highschoolers
By mohammad o t
•Mar 10, 2021
Very long videos
By Armon A
•Jul 25, 2021
The lectures were difficult to follow, and the material on the tests were not covered well.
By rverker
•Feb 2, 2025
It's really intolerable these MOOCs like this one that don't offer PDF support. The videos skim over the subjects, are messy and don't give enough examples. The trainer scribbles on the slides, making them illegible. The quizzes are all-or-nothing (you retake everything if you don't reach the threshold) and the advanced quizzes are ridiculous and useless. What's more, they're not corrected, so it's hard to understand your mistakes and improve. On the other hand, you can take them 15 million times if you have the patience.
By Nicolás C M
•Aug 14, 2020
It say introduction, but it is more advanced that it seems