If you are using the workbook by Gara (often paired with Kuznetsova), you can check GdzPutina.
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You can find the answers (reshebnik) for various 8th-grade chemistry workbooks from 2017 online through several educational platforms. Since there are different authors, here are the most common resources: Popular Reshebniks for 2017 Chemistry Workbooks If you are using the workbook by Gara
For those using Prosveshcheniye publications, you can use the Lecta Digital Workbook for interactive exercises. How to Find the Right One reshebnik po tetradi khimii 8 klass 2017 onlain
Цифровые рабочие тетради к учебникам «Просвещения»