Since direct solution keys for this specific 1993 edition are rare on mainstream GDZ websites, you can use these alternatives to verify your work:
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. Since direct solution keys for this specific 1993
Understanding the difference between observation (direct registration of events) and experimentation. Since direct solution keys for this specific 1993