CHEM 1120 Final Exam MCQ Practice – Multiple Choice Questions &
Solutions
To measure out a volume of liquid, start by choosing the appropriate graduated cylinder and
moving the bumper to the _______.
_________ of the graduated cylinder to protect it from breakage. Then, pour the liquid into the
graduated cylinder until the _________.
_______________ of the meniscus aligns with the desired volume marking when you look at
the graduated cylinder from _________. - ANS ✔✔top
bottom
eye level
Determine whether each of the errors listed affects the accuracy of pipets, or can lead to the
contamination of pipets.
The pipet is not cleaned thoroughly between uses.
Pipets are washed with detergent and then put to use immediately.
After the liquid is drained from the pipet, the final drop is pushed through with the pipet bulb.
The liquid level in a pipet is read from the top of the curve rather than the meniscus.
Air bubbles are present as the liquid is drawn up into the pipet and dispensed. - ANS
✔✔Contamination
Contamination
,Accuracy
Accuracy
Accuracy
To condition the buret, add a small volume of ________ to the buret and rotate the barrel
___________ so that the liquid makes contact with the full inner surface of the barrel. Complete
this action ________ and discard each volume in a designated waste container. - ANS ✔✔the
titrant
at an angle close to horizontal
2 more times
Determine whether each of the properties described applies to volumetric or graduated
glassware.
Capable of measuring a range of volumes of liquid
Used for applications in which great accuracy is needed
Designed to measure one specific volume of liquid - ANS ✔✔graduated
volumetric
volumetric
Identify the following errors as systematic or random.
The last digit on a pH meter fluctuates up and down as a measurement is taken.
A thermometer is placed such that the bulb makes poor contact with the measured substance,
giving erratic temperature readings.
, A micropipet is improperly calibrated, and the balance dispensed is always smaller than
expected.
A few drops of water are on a balance pan, causing the mass output on the balance to be high
each time it is used. - ANS ✔✔random
random
systematic
systematic
When using a clamp and ring stand to hold glassware and tools, what is the best position for the
clamp?
Select one:
As high as possible on the ring stand
Exactly opposite the base of the ring stand
As low as possible on the ring stand
Directly above the base of the ring stand - ANS ✔✔Directly above the base of the ring stand
Identify techniques to be used for accurate solution preparation using a volumetric flask.
Select one or more:
Read the liquid volume at eye level from the bottom of the meniscus.
If the solvent is accidentally added to the flask over the fill line, dump the excess.
After the solvent is added, stopper and invert the flask to mix the solution.
Do not worry if some undissolved solid remains at the bottom of the flask. - ANS ✔✔Read the
liquid volume at eye level from the bottom of the meniscus.
After the solvent is added, stopper and invert the flask to mix the solution.
Solutions
To measure out a volume of liquid, start by choosing the appropriate graduated cylinder and
moving the bumper to the _______.
_________ of the graduated cylinder to protect it from breakage. Then, pour the liquid into the
graduated cylinder until the _________.
_______________ of the meniscus aligns with the desired volume marking when you look at
the graduated cylinder from _________. - ANS ✔✔top
bottom
eye level
Determine whether each of the errors listed affects the accuracy of pipets, or can lead to the
contamination of pipets.
The pipet is not cleaned thoroughly between uses.
Pipets are washed with detergent and then put to use immediately.
After the liquid is drained from the pipet, the final drop is pushed through with the pipet bulb.
The liquid level in a pipet is read from the top of the curve rather than the meniscus.
Air bubbles are present as the liquid is drawn up into the pipet and dispensed. - ANS
✔✔Contamination
Contamination
,Accuracy
Accuracy
Accuracy
To condition the buret, add a small volume of ________ to the buret and rotate the barrel
___________ so that the liquid makes contact with the full inner surface of the barrel. Complete
this action ________ and discard each volume in a designated waste container. - ANS ✔✔the
titrant
at an angle close to horizontal
2 more times
Determine whether each of the properties described applies to volumetric or graduated
glassware.
Capable of measuring a range of volumes of liquid
Used for applications in which great accuracy is needed
Designed to measure one specific volume of liquid - ANS ✔✔graduated
volumetric
volumetric
Identify the following errors as systematic or random.
The last digit on a pH meter fluctuates up and down as a measurement is taken.
A thermometer is placed such that the bulb makes poor contact with the measured substance,
giving erratic temperature readings.
, A micropipet is improperly calibrated, and the balance dispensed is always smaller than
expected.
A few drops of water are on a balance pan, causing the mass output on the balance to be high
each time it is used. - ANS ✔✔random
random
systematic
systematic
When using a clamp and ring stand to hold glassware and tools, what is the best position for the
clamp?
Select one:
As high as possible on the ring stand
Exactly opposite the base of the ring stand
As low as possible on the ring stand
Directly above the base of the ring stand - ANS ✔✔Directly above the base of the ring stand
Identify techniques to be used for accurate solution preparation using a volumetric flask.
Select one or more:
Read the liquid volume at eye level from the bottom of the meniscus.
If the solvent is accidentally added to the flask over the fill line, dump the excess.
After the solvent is added, stopper and invert the flask to mix the solution.
Do not worry if some undissolved solid remains at the bottom of the flask. - ANS ✔✔Read the
liquid volume at eye level from the bottom of the meniscus.
After the solvent is added, stopper and invert the flask to mix the solution.
