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

4.7
stars
1,390 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

MR

Aug 8, 2019

An exceptional course to revise previous concepts. many a times strengthened my previously vague concepts. The interviews and especially the practical videos were very enlightening.

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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326 - 350 of 352 Reviews for Introduction to Chemistry: Reactions and Ratios

By Michael B

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Feb 18, 2017

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

By Sarah S

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Nov 12, 2019

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

By Martin L

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Feb 13, 2021

The video lectures taught you how to pass the tests and didn't really teach anything well.

By Casey D

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Oct 12, 2020

Great review for those who need refreshers and good for newcomers to chemistry!

By David A R

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Mar 23, 2023

Good explanations, actiivities and experimental examples.

By Kyla M T D C

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Oct 17, 2020

I gained a lot of knowledge with this course.

By M L

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Feb 9, 2018

It's a very good course and

clear teaching!

By JESSIE C

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Apr 3, 2021

Well explained course. Thank you.

By Amartya M

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Oct 28, 2020

Great course for concept clearance

By 王廷瑋

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Jul 17, 2017

clear concept explanation

By Ben D

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Nov 17, 2018

I rather enjoyed it. :-)

By Грязев В В

•

Dec 16, 2016

понятный и доступный

By John F

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Jul 1, 2020

a good introduction

By Nafiul A

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Jun 17, 2020

I loved this course

By Sarthak H

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Feb 5, 2026

Nice course

By Eb E

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Nov 12, 2019

Cool class!

By Sara b

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Nov 6, 2024

Good work

By Nicholas F

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Sep 18, 2022

good

By PERI S R K

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Jul 27, 2025

Good

By Nancy L

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May 1, 2021

I've found easier tutorials on YouTube for certain subjects but I really enjoyed the demos!

By Moosa K

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Jun 29, 2025

Informative and helpful for beginners as well as highschoolers

By mohammad o t

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Mar 10, 2021

Very long videos

By Armon A

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Jul 25, 2021

The lectures were difficult to follow, and the material on the tests were not covered well.