Middle School Chemistry: Free Course

About this course

Explore matter and its changes in this free middle-school chemistry course from Khan Academy. The complete thirty-video teaching playlist is retained, covering atoms, elements, compounds, mixtures, physical properties, water, acids and bases, heat and chemical reactions. Worked balancing examples and both reaction-energy parts remain available.

Course at a glance

What you’ll learn

• Connect atoms, elements and the periodic table with the course’s classification of matter.
• Distinguish compounds, molecules, mixtures and physical properties.
• Explore states, phase changes, density, water, acids, bases and heat.
• Follow chemical-equation, balancing and reaction-energy teaching examples.

Skills you’ll gain

• Chemistry foundations
• Matter classification
• Physical properties
• Chemical reactions
• Equation balancing
• Scientific vocabulary

Course Overview

The opening recordings introduce the building blocks of matter before the course turns to compounds and mixtures. Physical properties, temperature, states, phase changes and density establish a practical framework for describing matter. The water lessons extend that discussion into cohesion, adhesion, surface tension and dissolving. Acids, bases and the pH scale provide further classification examples, followed by heat, chemical changes, reactions, equations and balancing. The final two recordings discuss reaction-energy changes. All thirty source videos are included. The classroom is the recorded instructional edition; separate simulations, interactive questions and teacher resources on the platform are additional learning formats rather than included assessments.

How to study the course

• Begin with atoms, elements, compounds and mixtures. Explain why two terms differ before applying them to a familiar example.
• Work through physical properties, water and heat. Keep the observation or relationship being discussed separate from a memorized definition.
• Complete reactions, equations, balancing and both reaction-energy lessons. Use small written examples and check that the explanation accounts for the symbols you use.

Use the searchable classroom lesson list to revisit a specific explanation. Pause after a useful demonstration, reproduce a small example and explain the result in your own words. Keep a short note of what worked, what changed and what you still need to understand before moving on.

Who is this for?

This course suits middle-school learners, students preparing for further chemistry study and adults revisiting foundational science. Teachers can also use individual recordings as short explanations alongside appropriate classroom activities.

Before you start

Basic reading, arithmetic and willingness to learn scientific vocabulary are enough to begin. A notebook is useful for diagrams and written examples. The videos provide conceptual study rather than supervised laboratory work, graded school assessments or a qualification.

Put the lessons into practice

Create a small study notebook that separates classification, physical properties and chemical changes. Use invented or familiar examples to explain why an item belongs in a category, then connect one property with the relevant lesson. Practise a simple equation-balancing example on paper and write why the adjustment is needed. Compare a physical and a chemical change in words rather than relying on an illustration alone. Keep the exercise conceptual and use the source recording to check a term or relationship that remains uncertain.

This optional activity is provided by WikiFree for independent practice. It is not a graded assignment from the instructor. Keep your working notes, check the result against the task you defined and return to the relevant lesson when an assumption or technique is unclear.

Certificate / Assessment

Watching the public videos and using WikiFree progress tracking does not award a certificate, exam voucher, academic credit or instructor assessment.

Use your practice output to review what you can now explain and repeat independently. Completion tracking records your study progress; it does not replace an assessed qualification or professional experience.

Frequently asked questions

Provider: Khan Academy. Videos play from the Khan Academy channel on YouTube.