Chemistry

Free online chemistry lessons for elementary school, middle school and high school.
Take advantage of scientific resources that can be used freely to discover chemistry, the science of matter and its transformation

 

Chemistry

Water

• 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
• Decantation
• Centrifugation
• Filtration
• Vaporization of water
• Distillation
• Chromatography
• 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

• Atmosphere
• Earth's atmosphere protect us
• Threats to the Earth's atmosphere
• Composition of air
• Air and life
• Pressure

Atoms and molecules

• Molecules
• Molecules in mixtures and pure substances
• Molecules and states of matter
• Atoms
• Composition of molecules
• Constituents of the atoms
• The electrical neutrality of the atom
• Electronic arrangement
• Molar mass

Combustions

• 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
• Predicting the spontaneous evolution of a chemical system
  

Metals

• Most common metals
• How to distinguish metals ?
• Corrosion of metals
• Electrical conductivity of solid materials
• Electrons and free electrons
• Electric current in metals

Ions

• 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

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