Question

you are heating a substance in a test tube. always point the open end of the tube
○ toward yourself
○ toward your lab partner
○ toward another classmate
○ away from all people

Explanation:

When heating a substance in a test tube, the open end must be pointed away from people to prevent injury from splashing or escaping substances. Other options risk harm to oneself or others.

Answer:

D. away from all people