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

1,120 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


Aug 19, 2020

Thank you Professor Dorian A. Canelas! It made me much more easier to understand the basic principles of chemistry and it builds me a lot of confidence in answering some of the problems in chemistry.


Jun 12, 2020

It is a wonderful course for Middle school students. A first course in Chemistry, for the gifted students who will do AP Chemistry. Not suitable for adult learners who need an advanced introduction.

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26 - 50 of 290 Reviews for Introduction to Chemistry: Reactions and Ratios

By Sergey S

Aug 6, 2017

Excellent course! Great Prof. Canelas gave understandable, interesting and not boring lectures. I almost entirely forgot chemistry I learned in a high school and I didn't like it, but now I feel I know something and I got interest in discipline - chemistry is exciting)

There were couple minor mistakes in quizes (for example in one case the right answer was "aluminum sulfide" instead of "aluminium sulfide"), but they don't matter much.

By Natalie M

Jun 7, 2017

I took this course to revise some skills I got at my chemistry class in high school over 10 years ago. Thanks to prof. Canelas I figured out that I'm not hopeless at all. I liked the way the course is structured, the topics following one another, the slides, the explanations, and of course little funny jokes - everything was perfect. I really appreciate the sense of humor of the lecturer. Thanks prof. Dorian Canelas and the team!

By Tehseen U L

Sep 23, 2021

Prof Dorian A. Canelas is a wonderful teacher. Her lectures are very clear and informative and she does so in a kind, friendly, yet professional manner. I have learned so much in this course and sincerely appreciate what Duke University and Coursera have done to prepare it for us. The videos were just the right length and I found it super helpful that a transcript accompanied each video. Excellent course, I highly recommend it!

By Marium G

Nov 28, 2017

I really enjoyed the way Prof. Canelas teaches. This course brushes up some parts of what I have studied in my high school chemistry. No words to thank coursera for providing such a wonderful platform for homemakers like me who want to remain in touch with their subject while staying at home. Looking forward to taking another part of this course Introduction to chemistry - Structures and Solutions with full enthusiasm.

By Ivan Z

Jan 8, 2021

Very useful course go get back into chemistry if you have not known it before or if it's been a while. For me, it was almost 30 years since my last chemistry study in school, and a lot has changed since that time! This is particulary useful, if you plan to study biology or you want to understand the basics in medicine, drug percription and it is a great pre-requisite to further study of different disciplines!

By Daria N

May 12, 2020

I love the course. Good and clear explanations. Week 5 could be challenging if you try to really understand and don't have a big picture / the general concepts in mind, but some questions would be solved at week 6 lectures. If you don't remember chemistry from school at all you may need extra reading or video lectures. In any case - a good place to start, worth taking! Thank you, Professor Dorian Canelas.

By Rinaz J

Aug 21, 2021

The Introduction to Chemistry Course has undoubtedly helped me grasp the fundamentals of the complex field of chemistry! I am already seeing the results of taking this course this summer as I have made quite an impression on my high school science teacher and peers. I would highly recommend this course to anyone who desires a strong base in chemistry (pun intended).

By Liam A

Aug 7, 2018

I found this course to be very helpful. It has helped me to learn a lot about chemistry and has really boosted my confidence around studying. Professor Canelas explains topics in a really effective way, making it easy to understand without having to constantly rewind the video to make sense of it.

10/10 highly recommend for anyone looking to get into chemistry!

By Malaya M

Jun 30, 2021

It is a very helpful and Informative course. Well taught by Prof. Dorian A. Canelas . Thank you so much for the lectures which really helped me stand out in our class. I am class 10 student and understanding all these advanced concepts has really helped me a lot appreciate the beauty of chemistry in daily life. This course has enhanced my love for chemistry.

By Martine S

Dec 18, 2019

The course was very well presented and with a very limited knowledge of Chemistry I have been able to follow and complete it. The lectures were informative and easy to understand.

Thank you Professor Dorian Canelas who made the course interesting. I was not looking at achieving the Honours course but still enjoyed doing 2 out of the 3 Challenge problems.

By Mackenzie S

Jul 30, 2019

I loved this course so much! It was super helpful, and I feel very prepared for my upcoming chemistry class at school. The instructor was great, and she seemed super nice and she made the course interesting. :) I recommend this course to anyone that wants an overview of chemistry, because I feel like this course did a great job at that. Thank you!

By Raphaël R

Sep 8, 2018

The best way to learn the basics of Chemistry. I studied this course prior to a general course as part of a Physics Degree and it was very helpful. Prof. Canelas' explanations are really easy to follow and gives you a great understanding of the subjects. Plus you won't need a lot of math to go around this course. Basic algebra should be enough.

By Mike D

Dec 21, 2021

Never passed a chemistry course until I took this one. Super helpful at building the foundation for future learning. Dr. Canelas explained important concepts in detail and refreshed them throughout the course. At times, the explanations were very fast which caused some confusion, but luckily you can re-watch videos on demand. Thank you!

By Nam P Đ T

Sep 9, 2021

a very helpful course for who wants to know the basic stuffs regarding Chemistry. However, this course involves some intermediate knowledge, requiring background before attending. Love the way professor Calenas names the compound using the example of the basket ball teams. I love her so much. Hope I'll have chances to learn from her again.

By Jingyun W

Oct 29, 2019

Very clear logic and easy to understand for beginners. This class will be very helpful for beginners to develop the basic understanding of chemistry definitions, terms and scientific reasoning. For students who have known the basic theory of chemistry, you can consider more difficult courses. I would recommend this course to my students.

By Jesus A P

Apr 11, 2021

The course is excellent; the in video excercises do help to reinforce the material. The weekly exercises are completely relevant to the lectures. Dr. Canelas explains clearly and with great presentations; she makes you feel at ease, but makes you stay focused on the lecture. Thanks for offering the course on an audit option, too.

By Daziano A

Jul 9, 2017

Dorian Canelas is a fantastic teacher, and I like the way she teaches chemistry.

No hurry, step by step, very good lectures

I enjoyed a lot the lessons and the exercises

Dorian Canelas has the big power to explain in a very simple way the concepts and theories

and ask students to try calculations so to find the right ones!!!

By Yashwant P

Jun 18, 2020

This course was very helpful. The professor is very knowledgeable and it is very fun to learn. The in-class demos and experiments were fun. It might be a little frustrating at some points during harder concepts. But all things aside you learn a lot in this course and it is not too fast paced.

By Theodore L

Aug 21, 2022

Excellent intro chemistry class. Dr. Canelas is very straightforward, clear, normal (all of the things that my science teachers in school weren't). A testament to the fact that with a good teacher, and the desire to learn, no subject is beyond your understanding.

Thank you Dr. Canelas!!!

By Nik

May 30, 2020

Excellent. Very well articulated and explained, particularly the earlier weeks (acids and bases and redox reductions I found a little less thoroughly explained). Would definitely recommend to someone who was rusty on high school chemistry, or wanted to learn it for the first time.

By Rounak S

Jan 12, 2023

Helps to understand chemistry basics. The speaker is quite knowledgable about the subject and delivers the information in a very clear and verbose manner. Will be of help to any individuals regardless of their expertise levels, be it beginner, intermediate or an expert.

By Palak S

Jun 30, 2020

This professor is amazing!! I've taken plenty of intro chem courses from sixth grade through high school, but the way Dr. Canelas organizes and presents the material makes chemistry seem a lot easier & more interesting :)

Completed: in 2 weeks

Final Course Grade: 99.7 %

By Michelle L

Mar 23, 2021

This course was really helpful. Dr. Canelas explains things in very easy-to-understand ways. I was having so much trouble with some of the basic concepts of chemistry before taking the course and I have progressed so much! Really, really great course and professor.

By Victor T

May 18, 2020

The course is an excellent one. The tutor is so good to the extent that I never had to comment or ask question from the beginning to the end. I even finished it within 3 days. REGISTER TODAY AND YOU WILL NOT HAVE ANY CAUSE TO REGRET. I can assure you!!

By Najm C

May 15, 2021

The best course that can one have for introduction to chemistry, reached by a real chemist!

Thank you, Pr. Dorian for this great course. I'm grateful that I had the opportunity to learn chemistry through you.

See you in the next course, no doubt :) !