CHEM 121-GLASSWARE FINAL EXAM | UPDATED
QUESTIONS AND ANSWERS UPDATED .Buy Quality Materials!
use of beaker
roughly measuring, transporting, mixing, and holding chemcials
Erlenmeyer flask
used to hold and swirl liquids
Volumetric flask
used to make a standard solution of fixed solutions very precisely at room temperature
Precision of volumetric flask
+/- 0.01mL
standard solution
a solution with a concentration known to at least 4 significant figures
graduated cylinder
general measuring of volume-- CANNOT be used quantitatively
glass crucible
quantitatively trap solid particles during vacuum filtration, should not be touched with
bare hands
buret
used to deliver known, precise volumes of liquid during titration
volumetric pipet
allows extremely accurate volume; calibrated to account for the last drop
serological pipet
used to deliver solutions in increments; has a scale on the side, last drop must be blown
out
top-loading balance
used to weigh a sample where a high degree of accuracy is not needed
analytical balance
used for analytical work and weighs samples very accurately
Uncertainty Top-Loading Balance
+/- 0.01g
uncertainty of analytical balance
+/- 0.0001g
chromatography column
used to separate chemicals into their various components
mobile phase for column chromatography
water
stationary phase for column chromatography
silica gel
fume hood
ventilation device to limit exposure to toxic fumes
hot plate
used to heat solutions and aid in dissolving solids
oven
used for heating and drying
QUESTIONS AND ANSWERS UPDATED .Buy Quality Materials!
use of beaker
roughly measuring, transporting, mixing, and holding chemcials
Erlenmeyer flask
used to hold and swirl liquids
Volumetric flask
used to make a standard solution of fixed solutions very precisely at room temperature
Precision of volumetric flask
+/- 0.01mL
standard solution
a solution with a concentration known to at least 4 significant figures
graduated cylinder
general measuring of volume-- CANNOT be used quantitatively
glass crucible
quantitatively trap solid particles during vacuum filtration, should not be touched with
bare hands
buret
used to deliver known, precise volumes of liquid during titration
volumetric pipet
allows extremely accurate volume; calibrated to account for the last drop
serological pipet
used to deliver solutions in increments; has a scale on the side, last drop must be blown
out
top-loading balance
used to weigh a sample where a high degree of accuracy is not needed
analytical balance
used for analytical work and weighs samples very accurately
Uncertainty Top-Loading Balance
+/- 0.01g
uncertainty of analytical balance
+/- 0.0001g
chromatography column
used to separate chemicals into their various components
mobile phase for column chromatography
water
stationary phase for column chromatography
silica gel
fume hood
ventilation device to limit exposure to toxic fumes
hot plate
used to heat solutions and aid in dissolving solids
oven
used for heating and drying
