During the investigation illustrated above, students should do all of the following except —

A. use heat-treated glassware
Incorrect. Non-treated glassware can crack and break.

B. wear goggles - it is only water
Incorrect. Hot water can splash and burn eyes.

C. leave the laboratory set-up unattended
Correct! No fire should ever be left unattended.

D. use beaker tongs to handle the beaker
Incorrect. Besides the hot beaker, hot water can splash and scald.

How should you investigate the odor of a solution in an Erlenmeyer flask while in the laboratory?

A. With teacher permission, hold the flask slightly in front of you; gently waft the smell toward you by waving your hand.
Correct! This is the proper way to investigate the odor of a solution.

B. With the flask directly under your nose, inhale deeply so you can get the true sense of the smell.
Incorrect. Never directly smell any chemical. The vapors could damage your nose.

C. Never investigate the odor of any chemical solution.
Incorrect. If your teacher tells you that it is okay and you follow proper procedures it is okay to investigate the odor of chemicals.

D. Heat the solution first, and then move it back and forth under your nose as you smell it.
Incorrect. Never directly smell any chemical. The vapors could damage your nose.

This safety hazard symbol in the lab means that –

A. the chemical is flammable
Incorrect. The flammable symbol will have a flame in the center of it.

B. there is a risk of exposure to a poisonous chemical
Incorrect. The poison sign is a skull and crossbones.

C. there is an electrical hazard
Incorrect. The lightning bolt represents an electric shock.

D. hazardous fumes could be given off
Correct! The fumes coming from the test tube indicates hazardous fumes given off.

Darius is handling a test tube. While handling it he notices that it is chipped. What is the first thing he and his partner should do?

A. Nothing he should go ahead and use the test tube since it is just chipped.
Incorrect. You should never use broken or chipped glassware.

B. Notify the teacher.
Correct! Always report broken or chipped glassware to the teacher.

C. Switch the test tube with another group.
Incorrect. You should never use broken or chipped glassware and neither should anyone else.

D. Heat the test tube using a Bunsen burner.
Incorrect. You should never use broken or chipped glassware.

Tisha has her books on the desk and in the aisle. While working at her lab, her safety glasses are on the lab table. What should Tisha do to make sure she is safe in the lab?

A. Place the books away from the lab area.
Incorrect. She should remove the work area of the clutter but is that all she should do to ensure her safety?

B. Nothing, she is perfectly safe to work in the lab.
Incorrect. All clutter should be removed from the lab area and safety goggles should be worn.

C. Put on her safety goggles.
Incorrect. She should wear her safety goggles but what else should she do to ensure safety?

D. Place the books away from the lab and put on her safety goggles.
Correct! All clutter should be removed from the lab area and safety goggles should be worn.