CHEM 101L QUESTIONS AND ANSWERS
How should you dress in lab?
-No exposed ankles
-Shoes that cover the upper part of your foot
-Any clothing with holes offers no protection from spills and other lab hazards.
If you need to work with a flammable or volatile solvent, which piece of lab
equipment should you be sure to use?
Fume hood with good ventilation
What is the most important consideration to preserve safety when it is necessary
to feed tubing, thermometers, or another apparatus through a rubber stopper?
Using the correct hand position so that if something goes wrong you can avoid coming
into contact with broken or sharp ends
Which of the following explains why the lab safety policy specifically addresses
loose clothing, contact lenses, and large, loose, or dangling jewelry?
All of the following are true:
-Contact with chemicals in the lab might damage these items.
-Loose clothing and jewelry is more likely to impede movement, or accidentally knock
materials over, causing a spill or other accident.
-In the event of a spill or spray of reagent, all of these items are likely to hold the
chemical close to the skin, making it harder to remove and therefore increasing the risk
of injury.
-Loose clothing or jewelry is more likely to present a fire hazard if open flames are used
in the lab for any reason, or if a fire begins accidentally.
The correct process for disposing of liquid waste containing hazardous material
would be:
-Step one: Bring the waste to the liquid waste bottle in the fume hood
-Step two: Check the liquid level in the waste bottle. If the level is within 2" of the neck of
the bottle, notify your TA so that the bottle won't be overfilled
-Step three: Read the label on the waste bottle to be sure it is meant for the correct
experiment and the correct waste material
-Step four: Open the latch, life the funnel cover out of the way, and pour the waste into
the funnel
-Step five: Close the funnel lid until the latch snaps into place
In some circumstances, using the fire extinguisher found in the laboratory may
be necessary. Which of the following scenarios represents an appropriate use of
a fire extinguisher?
A handful of paper towels in the garbage can has caught fire. The fire is small and
relatively contained within the trash can.
Your lab partner accidentally trips and douses the front of your lab coat and shirt
with a hazardous material. The TA immediately takes you to the safety shower,
since the spill has soaked into your clothing. What do you need to do at this
point?
, -Stay under the shower for at least 15 minutes.
-Remove your shirt and any other clothing that were in contact with the chemical.
Which of the following items are not allowed in the lab space during lab, but must
be stored in appropriate locations?
-Backpack
-Water bottle
-Food or snacks
-Cell phone
(You can have your laptop and calculator)
While weighing out a reagent for use in an experiment, a student finds he has
leftover reagent. The student should:
Place the excess reagent in the appropriate solid or liquid waste container to prevent
contamination of the stock reagent.
When should you inspect the glassware in your lab drawer for chips, cracks, or
chemical residues?
Glassware should be inspected at all of these times (during the experiment, during the
check-in, and before the beginning of every experiment) to prevent accidents, injuries,
or unwanted complications during experimental work
Order the following steps in the correct procedure for lighting and working with a
Bunsen burner:
-Step 1: Make sure all loose clothing and hair have been properly restrained and will not
contact the flame accidentally
-Step 2: Prepare the work space to be sure no flammable materials are in the vicinity of
the open flame
-Step 3: Inspect the tubing to the gas valve to be sure it does not have cracks or holes
that would allow a gas leak
-Step 4: Inspect the burner to be sure that the air intake and fuel valves move properly
and can be adjusted
-Step 5: With the sparker in hand, turn on the gas and light the flame as soon as
possible to minimize unburned gas in the air
-Step 6: Adjust the fuel valve to set the height of the flame and adjust the air intake to
adjust the temperature (color) of the flame, according to the instructions in the lab
manual
-Step 7: Monitor the flame and all nearby materials closely until the experiment is
completed. Never leave an open flame unattended
-Step 8: Shut off the burner and gas valve as soon as experimental work is completed
(or anytime you must leave it unattended)
A note about Bunsen and Meker burners: The fuel valve determines how quickly fuel is
supplied to the combustion, which determines the flame height. The air intake
determines how quickly oxygen is supplied to the combustion (how lean/rich the mixture
is), which determines the flame temperature.
Which of the following must be completed before taking the quiz?
-Store your backpack, cell phone, jacket, and all other nonessential items in designated
storage areas.
How should you dress in lab?
-No exposed ankles
-Shoes that cover the upper part of your foot
-Any clothing with holes offers no protection from spills and other lab hazards.
If you need to work with a flammable or volatile solvent, which piece of lab
equipment should you be sure to use?
Fume hood with good ventilation
What is the most important consideration to preserve safety when it is necessary
to feed tubing, thermometers, or another apparatus through a rubber stopper?
Using the correct hand position so that if something goes wrong you can avoid coming
into contact with broken or sharp ends
Which of the following explains why the lab safety policy specifically addresses
loose clothing, contact lenses, and large, loose, or dangling jewelry?
All of the following are true:
-Contact with chemicals in the lab might damage these items.
-Loose clothing and jewelry is more likely to impede movement, or accidentally knock
materials over, causing a spill or other accident.
-In the event of a spill or spray of reagent, all of these items are likely to hold the
chemical close to the skin, making it harder to remove and therefore increasing the risk
of injury.
-Loose clothing or jewelry is more likely to present a fire hazard if open flames are used
in the lab for any reason, or if a fire begins accidentally.
The correct process for disposing of liquid waste containing hazardous material
would be:
-Step one: Bring the waste to the liquid waste bottle in the fume hood
-Step two: Check the liquid level in the waste bottle. If the level is within 2" of the neck of
the bottle, notify your TA so that the bottle won't be overfilled
-Step three: Read the label on the waste bottle to be sure it is meant for the correct
experiment and the correct waste material
-Step four: Open the latch, life the funnel cover out of the way, and pour the waste into
the funnel
-Step five: Close the funnel lid until the latch snaps into place
In some circumstances, using the fire extinguisher found in the laboratory may
be necessary. Which of the following scenarios represents an appropriate use of
a fire extinguisher?
A handful of paper towels in the garbage can has caught fire. The fire is small and
relatively contained within the trash can.
Your lab partner accidentally trips and douses the front of your lab coat and shirt
with a hazardous material. The TA immediately takes you to the safety shower,
since the spill has soaked into your clothing. What do you need to do at this
point?
, -Stay under the shower for at least 15 minutes.
-Remove your shirt and any other clothing that were in contact with the chemical.
Which of the following items are not allowed in the lab space during lab, but must
be stored in appropriate locations?
-Backpack
-Water bottle
-Food or snacks
-Cell phone
(You can have your laptop and calculator)
While weighing out a reagent for use in an experiment, a student finds he has
leftover reagent. The student should:
Place the excess reagent in the appropriate solid or liquid waste container to prevent
contamination of the stock reagent.
When should you inspect the glassware in your lab drawer for chips, cracks, or
chemical residues?
Glassware should be inspected at all of these times (during the experiment, during the
check-in, and before the beginning of every experiment) to prevent accidents, injuries,
or unwanted complications during experimental work
Order the following steps in the correct procedure for lighting and working with a
Bunsen burner:
-Step 1: Make sure all loose clothing and hair have been properly restrained and will not
contact the flame accidentally
-Step 2: Prepare the work space to be sure no flammable materials are in the vicinity of
the open flame
-Step 3: Inspect the tubing to the gas valve to be sure it does not have cracks or holes
that would allow a gas leak
-Step 4: Inspect the burner to be sure that the air intake and fuel valves move properly
and can be adjusted
-Step 5: With the sparker in hand, turn on the gas and light the flame as soon as
possible to minimize unburned gas in the air
-Step 6: Adjust the fuel valve to set the height of the flame and adjust the air intake to
adjust the temperature (color) of the flame, according to the instructions in the lab
manual
-Step 7: Monitor the flame and all nearby materials closely until the experiment is
completed. Never leave an open flame unattended
-Step 8: Shut off the burner and gas valve as soon as experimental work is completed
(or anytime you must leave it unattended)
A note about Bunsen and Meker burners: The fuel valve determines how quickly fuel is
supplied to the combustion, which determines the flame height. The air intake
determines how quickly oxygen is supplied to the combustion (how lean/rich the mixture
is), which determines the flame temperature.
Which of the following must be completed before taking the quiz?
-Store your backpack, cell phone, jacket, and all other nonessential items in designated
storage areas.
