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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