7th class. Chemistry0+
The mass fraction of an element in a complex substance.
The mass fraction of an element in a complex substance.
Physical and chemical phenomena
Physical and chemical phenomena
Chemical properties of substances
Chemical properties of substances
Law of conservation of mass
Law of conservation of mass
Chemical equations
Chemical equations
Air.
Air.
Oxygen
Oxygen
Extraction of oxygen
Extraction of oxygen
Interaction of oxygen with simple substances
Interaction of oxygen with simple substances
Oxides.
Oxides.
Combustion of some complex substances
Combustion of some complex substances
Oxygen circulation.
Oxygen circulation.
Use of oxygen
Use of oxygen
Water in nature.
Water in nature.
Water as a solvent.
Water as a solvent.
The mass fraction of the dissolved substance
The mass fraction of the dissolved substance
Preparation of the solution.
Preparation of the solution.
Reactions of water with oxides.
Reactions of water with oxides.
Available on devices
Translation
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See also
1st class. Ukrainian language
1st class. Science
2nd class. Science
3rd class. Art
4th class. Science
5th class. English
5th class. Mathematics
6th class. Art
6th class. English
6th class. Mathematics
6th class. Ukrainian language
7th class. Biology
7th class. Geography
7th class. Geometry
8th class. Biology
8th class. English
8th class. Geography
8th class. Physics
8th class. Ukrainian language
9 class. Algebra
9 class. English
9 class. Geography
10 class. Chemistry
10 class. History of Ukraine
10 class. Physics
10 class. World History
11 class. Algebra and beginnings of analysis
11 class. Biology and ecology
11 class. World Literature
11 class. Geometry
11 class. Physics
11 class. World History
3-6 years: numbers/counting
6-9 years: science and experiments
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