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Learner Reviews & Feedback for Introduction to Chemistry: Reactions and Ratios by Duke University

4.7
stars
1,386 ratings

About the Course

This is an introductory course for students with limited background in chemistry; basic concepts involved in chemical reactions, stoichiometry, the periodic table, periodic trends, nomenclature, and chemical problem solving will be emphasized with the goal of preparing students for further study in chemistry as needed for many science, health, and policy professions....

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.

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301 - 325 of 350 Reviews for Introduction to Chemistry: Reactions and Ratios

By 佐々木駿

Jun 16, 2022

Great!

By Yovelle P X L

Jun 11, 2020

Thanks

By Gyanendra

Jun 4, 2017

Great!

By سديم

Dec 8, 2025

رائعه

By Mahima V

Nov 24, 2025

good

By Therishikaa

May 13, 2025

good

By ranjitha r

Jan 7, 2021

Good

By M Z U M

Sep 26, 2020

Good

By Simonas M

Sep 26, 2020

good

By Dr. M B

May 10, 2020

good

By Brenno F D S S

May 10, 2021

god

By Uri S

Apr 18, 2022

:)

By Амангелдиева А М

Jun 22, 2024

.

By Safira r

Aug 30, 2022

O

By Josh F

Nov 17, 2019

On the whole this course was worth my time. I had never taken a chemistry class and I was looking for a course to prepare me for other science courses that required a background in basic chemistry. I found the course very easy and quick. All concepts were well explained, except those in week 6, where a plethora of new and basically unexplained notation (Lewis Dot models, chemical structure diagrams) made the lectures harder to follow. I expect that I will learn more about that notation in the second course.

By NIJITHA N

Sep 12, 2020

It was a wonderful experience. All lectures were excellent. Simple and clear kind of lecturing it was very easy and interesting to follow. Sometimes i feel sad if my phone shows low battery power during the class time. I hope i could attend almost week exercises well. Demonstrations also very helpful. I spent time for getting better mark by repeating exams when ever my percentage become low. Special thanks to Prof. Dorian Canelas.

By Anusha. A

Apr 18, 2026

Great content! As a thirteen-year-old having virtually basic to no prior knowledge in stoichiometry, I found this incredibly useful. Very approachable, and quizzes were actually easy and doable once you've gotten the hang of the core concepts. But honestly - honors were grim but rewarding! Overall, a very good course to opt for if you're willing to take my word and your time for it. :)

By Sanni K

Sep 15, 2022

I have not had chemistry for about 12 years but was able to follow the course without any problems in order to review the basic concepts of chemistry. It's really for beginners, but still makes you feel the progress of what you've learned while advancing the class. A good balance between theoretical concepts and stoichiometrical calculation. Thanks!!

By Кондратьев Г А

Apr 10, 2026

Отличный курс для начинающих: материал структурирован, много примеров и задач, а лектор подробно объясняет правила, расчёты по формулам и типы химических реакций. Единственный минус — некоторые задания на платформе Coursera сформулированы неоднозначно, но в целом курс даёт прочную базу по общей химии

By Rohan H

Aug 9, 2018

Quality course. Very basic in material but fabulous to understand nomenclature and other technical necessities. I used it to prepare for a honors chemistry course I am taking in my sophomore year of high school. It, in my opinion, is perfect for that use.

By Johanán B A P M

Aug 30, 2023

Le doy 4 estrellas,bien explciado pero por motivos de mi establecimiento debi temrinarlo rapido no logre hacer los demas ejercicios con honores y aparte mu buena explicacion para retroaliementar los temas vistos

By Crystal Q T Z

Dec 29, 2017

Clear explanations and an excellent course for beginners. Very slow to begin, but informative and thorough.

By Michael B

Feb 17, 2017

There were some errors in the video playback, one entire lesson near the end seemed like it was skipped.

By Sarah S

Nov 12, 2019

I wish more time was spent going over the mathematical equations and more examples were given.