It is highly likely that you are referring to (often just called the Hebden Workbook ). The number "20" in your query likely refers to a specific edition year (e.g., 2020) or a page number .
However, there is a critical issue: The workbook is a copyrighted, commercially sold textbook used heavily in British Columbia (Canada). --- Hebden Chemistry 11 A Workbook For Students Pdf 20
Below is a of the workbook itself (based on the standard 2019/2020+ editions), followed by important information regarding the PDF. Detailed Review: Hebden Chemistry 11 Workbook Target Audience: Grade 11 Chemistry students (primarily in British Columbia, aligning with the new curriculum). It is highly likely that you are referring