4. Each CSA is expected to know what chemicals they are working with. a. True b. False

## Step 1<br />This problem is a statement about the responsibilities of a Chemical Safety Assistant (CSA). The statement is: "Each CSA is expected to know what chemicals they are working with."<br /><br />## Step 2<br />The CSA's role involves ensuring the safety of chemicals in a laboratory setting. This includes knowing the chemicals they are working with to ensure safe handling and to prevent accidents.<br /><br />## Step 3<br />Given the importance of this responsibility, the statement is true.