Since direct solution keys for this specific 1993 edition are rare on mainstream GDZ websites, you can use these alternatives to verify your work:
Platforms like the Russian State Library (NEB) allow you to view the bibliographic details and sometimes digitized excerpts of the manual.
Older editions are often sold on Ozon or second-hand book sites, where you might find a copy that includes the answer key in the appendix. Key 8th Grade Topics to Master Since direct solution keys for this specific 1993
If you are struggling with a specific task from the manual, ensure you understand these core formulas and definitions often tested in Sofronov’s tasks: is the valence of the metal.
Organizing elements by atomic number and group properties. How to Find Solutions (GDZ) Organizing elements by atomic number and group properties
The content typically covers the foundational 8th-grade chemistry curriculum: Atoms, molecules, and chemical formulas. Atomic Structure: Protons, neutrons, and electron shells. Chemical Bonds: Ionic, covalent, and metallic bonding.
Understanding the difference between observation (direct registration of events) and experimentation. Chemical Bonds: Ionic, covalent, and metallic bonding
Use sites like YaClass or InternetUrok to find similar problems. They provide step-by-step theory that matches the tasks in Sofronov's manual.