7th class. Chemistry
The mass fraction of an element in a complex substance.

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

Physical and chemical phenomena

Chemical properties of substances

Chemical properties of substances

Chemical properties of substances

Law of conservation of mass

Law of conservation of mass

Law of conservation of mass

Chemical equations

Chemical equations

Chemical equations

Air.

Air.

Air.

Oxygen

Oxygen

Oxygen

Extraction of oxygen

Extraction of oxygen

Extraction of oxygen

Interaction of oxygen with simple substances

Interaction of oxygen with simple substances

Interaction of oxygen with simple substances

Oxides.

Oxides.

Oxides.

Combustion of some complex substances

Combustion of some complex substances

Combustion of some complex substances

Oxygen circulation.

Oxygen circulation.

Oxygen circulation.

Use of oxygen

Use of oxygen

Use of oxygen

Water in nature.

Water in nature.

Water in nature.

Water as a solvent.

Water as a solvent.

Water as a solvent.

The mass fraction of the dissolved substance

The mass fraction of the dissolved substance

The mass fraction of the dissolved substance

Preparation of the solution.

Preparation of the solution.

Preparation of the solution.

Reactions of water with oxides.

Reactions of water with oxides.

Reactions of water with oxides.

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See also

3rd class. Mathematics

3rd class. Mathematics

3rd class. Art

3rd class. Art

4th class. Mathematics

4th class. Mathematics

4th class. Science

4th class. Science

4th class. Art

4th class. Art

5th class. Art

5th class. Art

5th class. English

5th class. English

6th class. English

6th class. English

6th class. Geography

6th class. Geography

7th class. Chemistry

7th class. Chemistry

7th class. Geography

7th class. Geography

8th class. Algebra

8th class. Algebra

8th class. Biology

8th class. Biology

9 class. World Literature

9 class. World Literature

9 class. History of Ukraine

9 class. History of Ukraine

10 class. English

10 class. English

10 class. World Literature

10 class. World Literature

11 class. English

11 class. English

11 class. World History

11 class. World History

1st class. Mathematics

1st class. Mathematics

3-6 years: numbers/counting

3-6 years: numbers/counting

6-9 years: English language

6-9 years: English language

6-9 years: mathematics

6-9 years: mathematics

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