When you heat a test tube, what should you do? (select all that apply.)
a. put a stopper in...
When you heat a test tube, what should you do? (select all that apply.)
a. put a stopper in the top of the tube to prevent fumes from escaping.
b. point the tube opening away from your face or the faces of others.
c. look inside the tube often to observe results.
d. pick the tube up with a test tube holder or protected hands.
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