Coursera · Duke University
Introduction to Chemistry: Reactions and Ratios
A foundational chemistry course introducing matter, atomic structure, chemical reactions, and the quantitative reasoning behind reaction ratios.
Beginner10+ hoursCertificate
Chemistry courses and tutorials
Explore introductory chemistry courses for reactions, quantities, and chemical reasoning, with guidance on algebra, units, and practicing calculations with clear assumptions.
1 learning resource in this collection
About Chemistry
Chemistry connects the behavior of substances with models and quantitative relationships. Reactions and ratios become clearer when symbols, units, and observations are kept together. Basic algebra is useful for introductory calculations.
Choose a useful starting point
Choose a course that matches your preparation and works through the reasoning behind an equation. Practice identifying what is known and what is being asked. An online introduction is different from supervised laboratory training.
Build on the lessons
Work a small reaction-quantity problem, label the units, and check the result against the original question. Explain the assumptions before interpreting the number.