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Free chemistry and physics lessons

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Learning physics and chemistry easily and freely - Science for elementary school, middle school and high school
This free website will help you to enrich your learning in science. It provides free science online ressources for kids, students, beginners, parents looking for homeworks help and everyone curious about physics and chemistry. It can be useful for self studying, to review lessons, to prepare for science exams, for learning scientific basis and even for school projects.All learners can access without restriction to science lessons in various fields such as chemistry, electricity, optics or mechanics written with scientific rigor. Most of these lessons, written with simple words, include basics notions making them understandable by everyone.

Chemistry lessons
Water, states of matter, atom, molecule, chemical reaction, ion, combustion, metal ...

Electricity lessons
Electric circuit, current, conductor, insulator, Ohm's law, series and parallel circuit, circuit diagram ...

Mechanics lessons
motion, speed, trajectory, mass, weight, rotation, kinetic energy, Isaac Newton ...

Optics lessons

Light, laser, shadow, propagation of light, ray, converging and diverging lens, color ...

chemistry class electricity class optics class mechanics class

Water on Earth
Changes of state in the nature: the water cycle
Water in human body
Test for water
Properties of water in different states
States of matter
States of matter and its changes
Boiling water
Water: freezing and melting
Changes of state: mass and volume
Molecules in different states of matter

Mixtures and solutions
Heterogeneous mixtures
Homogeneous mixtures
Vaporization of water
Dissolving a solid in water
Conservation of mass on dissolving
Miscibility in water
Molar concentration
Mass and volume
Volume and its units
Measuring volume with a graduated cylinder
Mass and its units
Measuring the mass of a liquid
Mass of a liter of water
Volumetric mass density
Molar mass
Air and atmosphere
Earth's atmosphere protect us
Threats to the Earth's atmosphere
Composition of air
Air and life
Atoms and molecules
Molecules in mixtures and pure substances
Molecules and states of matter
Composition of molecules
Constituents of the atoms
The electrical neutrality of the atom
Electronic arrangement
Molar mass
Basics of combustion
The combustion of carbon
The combustion of butane
Atoms and chemical reactions
Chemical reactions
Chemical equations
Law of conservation of mass
Chemical synthesis

Most common metals

How to distinguish metals ?

Corrosion of metals

Electrical conductivity of solid materials

Electrons and free electrons

Electric current in metals
The conductivity of aqueous solutions
Aqueous solutions and ions
The direction of movement of ions
Formation of ions
Tests for ions
Acidic and basic solutions
pH of aqueous solutions
Ions in acidic and basic solutions
Dilution of acids and bases
Composition of hydrochloric acid
Chemical reaction between iron and hydrochloric acid

Electrochemical cells and chemical energy
Chemical reaction beteween a copper sulphate solution and zinc
Copper sulfate and zinc battery
Basics of electrochemical cell

Electrical components
Two-terminal electronic components
Basic electrical components
What's a resistor ?
How to determine a resistor value ?
Resistors effects in circuits
How to use a resistor ?
Characteristic curve of a resistor

How to build simple circuits and draw diagrams
How to build a basic electrical circuit
How to draw diagrams of electric circuits

The electric current
Conductors and insulators
Direction of electric current in a circuit
The dangers of electricity
Current intensity - units
how to measure current ?
The Voltage
The voltage and its units
How to measure a voltage ?
Voltage in open and closed circuits
Rated current and voltage for a lamp
Alternating voltage and current
Alternating currents effects on led
What are alternating current and voltage ?
Periodic alternating voltage and its properties
Measuring RMS voltage with a voltmeter
Serie circuits
What's a serie circuit ?
Series circuit properties
Short circuit in  series circuit
Current law in series circuits
Voltage law in series circuits
Parallel circuits
What's a parallel circuit ?
Some parallel circuits properties
Short circuits in parallel circuits
Nodes and branches in parallel circuits
Current laws in parallel circuits
Voltage laws in parallel circuits
Laws of electricity
Ohm's law
Current laws in series circuits
Voltage laws in series circuits
Current laws in parallel circuits
Voltage laws in parallel circuits
Generating electricity
Voltage for coil wires
What is an alternator ?
Alternating currents and voltages
Generating electricity in power plants

Electric power and energy
Electric power and power rating
Electric power received by an electrical device
Electric power consumption by an electrical device
Relationship between Electric power and energy


Light sources
Types of light sources
Why can we see objects ?

Propagation of light
Rectilinear propagation of light
beams of light
Speed of light
Light and distances
Shadows, lunar eclipses and phases of the moon
Formation of shadows
The Moon and eclipses

Colored lights - color of objects
Decomposition of white light
Colored lights
Color of objects
Image formation - Thin lenses
Thin converging and diverging lenses
Image formation by thin lenses
Vision and eyes


The solar system - motions of celestial bodies
Physical interactions
Effects of gravity
Weight of an object
Difference between weight and mass
Relationship between weight and mass
Gravitational acceleration

Energy basics
Potential energy
Kinetic energy
Mechanical energy
Translational Kinetic Energy
kinetic energy mass and speed