Free online course Chemistry Course

Duration of the online course: 6 hours and 32 minutes

4.43

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Build confidence in chemistry basics with this free online course—states of matter, mixtures, measurements, and sig figs—plus practice questions and certificate-ready skills.

About the free online course

Strengthen your understanding of chemistry from the ground up with a free online course designed to make core concepts feel clear and usable, not intimidating. Whether you are studying for school, preparing for exams, or returning to science after a break, this course helps you connect everyday observations to the chemical principles behind them.

You will develop a solid foundation by exploring how chemists describe matter and change. Learn to distinguish elements, compounds, and mixtures, and recognize the difference between homogeneous and heterogeneous materials using practical, real-world reasoning. You will also build intuition about states of matter, including why substances behave differently as solids, liquids, gases, or plasma, and what causes transitions like melting and boiling. Concepts like intermolecular forces come to life through accessible explanations that show why water’s boiling point is unusually high compared to many other small molecules.

To support strong scientific thinking, the course emphasizes measurement skills that show up everywhere in chemistry. You will practice temperature conversions between Celsius and Kelvin, understand what makes the Kelvin scale unique, and learn how density links mass and volume to help identify materials. Just as important, you will gain confidence working with significant figures, accuracy, and precision so your calculations reflect appropriate scientific reporting rather than just a numeric answer.

Throughout, short lessons are paired with targeted practice questions so you can check your understanding immediately and improve faster. By the end, you will be able to interpret basic chemical information, choose correct symbols and properties, and perform common calculations with greater reliability—skills that support further study in chemistry, lab work, and other science courses.

Course content

Video class: Intro to Chemistry

1h08m
Exercise: Which of the following statements best describes a heterogeneous mixture?
Video class: What are States of Matter in Chemistry? - Solid - Liquid - Gas - Plasma - [1-1-2]

34m
Exercise: Which of the following best describes why water has a relatively high boiling point?
Video class: Intro to Elements, Compounds,

45m
Exercise: Which of the following is the correct chemical symbol for the element of gold?
Video class: What is Chemical

32m
Exercise: Which of the following properties of a substance refers to its ability to burn and react with other chemicals?
Video class: What are Homogeneous

15m
Exercise: Which of the following is NOT a characteristic of a homogeneous mixture?
Video class: What is Energy

56m
Exercise: Which of the following contains the greatest potential energy?
Video class: Convert Celsius to Kelvin

36m
Exercise: Which of the following is NOT a correct statement regarding the Kelvin temperature scale?
Video class: What is Density in Chemistry

42m
Exercise: What is the density of an object in grams per cubic centimeter if its mass is 124 grams and its volume is 16 cubic centimeters?
Video class: What are Significant Figures, Precision

33m
Exercise: Which of the following best describes the difference between accuracy and precision in scientific measurements?
Video class: Add, Subtract, Multiply, Divide w/ Significant Figures (Sig Fig Rules) - [1-1-15]

28m
Exercise: In chemometry, which rule is applied for determining the number of significant figures in the result of a multiplication or division operation?