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.
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