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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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176 - 200 of 290 Reviews for Introduction to Chemistry: Reactions and Ratios

By Daniela M

Mar 19, 2022

Amazing teacher, super clear for beginners too!

By Lorena R

Dec 13, 2020

Excellent course, excellent teacher, thank you!

By Alexander S

Jul 2, 2021

Thank you for the efficient and useful course!

By Albert K

Jul 31, 2020

Thank you so much. This is excellent course


Jun 15, 2020

This course has helped to refresh my basics

By Afsar u D

May 13, 2020

it is excellent course for basic chemistry

By Dr. S J M

Apr 30, 2020

The course was helpful and encouraging ...

By Liz C

Jun 19, 2017

Thanks Dr Canelas! You gave me confidence.

By Lot

Mar 11, 2021

Really great course. Fun and interactive!

By M

Oct 20, 2017

I learned something new. That was my goal

By Mohammad t d

Jul 4, 2020

the lessons are very useful and exciting

By Gayathry B

May 7, 2020

I'm really glad to joined in this course

By Proshanta R

Aug 23, 2020

I have learn about many unknown things

By Carlos A C A

Aug 19, 2020

Excellent! thanks for the opportunity!

By Ong C W

May 9, 2020

Good course for

High School Chemistry

By Deleted A

Jun 21, 2020

Really good course! I learned a lot!

By Yousef A

Jun 20, 2020

a very fruitful course of chemistry.

By Sherry H

Mar 24, 2019

Very informative and great teacher!

By Alfonso O

Apr 20, 2017

Great class! Absolutely enjoyable!!

By Marionel E

Sep 23, 2020

A good course, easy to understand.

By Yoe

Apr 18, 2017

nice chemical course for beginners

By Bryan S

Jul 17, 2021

Alot of work but this was great!

By Fernando D G

May 5, 2020

Great Teacher, Explains excellent

By SeonMi J

May 21, 2020

I enjoyed this course very much.

By zoha a

Jul 9, 2021

This course was greatly helpful