List three hazardous chemicals used in the synthesis

1. List three hazardous chemicals used in the synthesis of either the known or unknown compounds.For each chemical describe a precaution you take when handling the chemical.(Make sure to write a different precaution for each chemical.)2. We are synthesizing Co(III) compounds in this lab yet the starting material for all of the compounds is a Co(II) compound.Why? How do we convert the Co(II) to Co(III)?3. What is the purpose of a fume hood?4. List two key safety points for working in a fume hood.