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Opiniones y comentarios de aprendices correspondientes a Introduction to Chemistry: Reactions and Ratios por parte de Universidad Duke

667 calificaciones
177 revisiones

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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....

Principales revisiones


Aug 20, 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 13, 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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151 - 172 de 172 revisiones para Introduction to Chemistry: Reactions and Ratios

por LIM P X

Jun 11, 2020


por Gyanendra

Jun 04, 2017


por Dr. M B

May 10, 2020


por 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.

por nijitha k

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.

por Rohan H

Aug 10, 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.

por Lucille G

Aug 20, 2020

helpful course, but advanced problem sets are sometimes much more difficult than concepts shown in video sessions

por Crystal Q T Z

Dec 29, 2017

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

por Michael B

Feb 18, 2017

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

por Sarah S

Nov 12, 2019

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

por M L

Feb 09, 2018

It's a very good course and

clear teaching!

por 廷瑋 王

Jul 17, 2017

clear concept explanation

por Habib U

Oct 11, 2019

helpful for the biginner

por Dr. B D

Nov 18, 2018

I rather enjoyed it. :-)

por Грязев В В

Dec 16, 2016

понятный и доступный

por John F

Jul 01, 2020

a good introduction

por Nafiul A

Jun 17, 2020

I loved this course

por Eb E

Nov 12, 2019

Cool class!

por Ian S

Apr 17, 2020

Waste of time. Hard to follow. Jumpy. Moves too quickly. Expects you to know the answer before even explaining how to find it. A joke.

por Nicolás C M

Aug 15, 2020

It say introduction, but it is more advanced that it seems

por Aman T

Jun 05, 2020

waste of time