ChTLE 2024 Test Bank 6 (Laboratory Equipment/Apparatus/Glassware)

Which is not a volumetric glassware?

a. beaker

b. burette

c. pippette

d. volumetric flask

A.

Ambient laboratory conditions are not the same to standard conditions, therefore the volumes dispensed in volumetric glassware are often not the same as the manufacturer's specifications, but within some acceptable limits determined by the manufacturer. This slight variation in volume will cause a _________ error that are based on volume-volume or mass-volume concentrations.

a. random

b. systematic

c. gross

d. all of the above

B.

Glass cuvettes are typically for use in the wavelength range of visible light, whereas fused quartz tends to be used for ____________ applications.

a. microwave

b. IR

c. uv/visible

d. none of the above

C.

In this column type, the retention is governed by the interaction of the polar parts of the stationary phase and solute.

a. reverse phase

b. ion exchange

c. column guard

d. normal phase

D.

A stable light source in AAS analysis, which is necessary to emit the sharp characteristic spectrum of the element to be determined.

a. Tungsten lamp

b. hollow cathode lamp

c. deuterium lamp

d. Nerst blower

B.

The HPLC column type in which molecules are separated according to size.

a. Ion exchange

b. size exclusion

c. normal phase

d. reverse phase

B.

Non Polar Reverse phase and C8 (octyl bonded silica) are commonly used for hydrophobic Analytes in solid phase extraction. An example is:

a. C18 (octadecyl bonded silica)

b. Resins

c. Florisil

d. alumina

A.

Filters that can be heated and used in gravimetric analysis.

a. ordinary filter paper

b. GFF

c. Sintered glass fibers

d. none of the above

B.

Objects cannot be weighed when hot or warm. But if you were to take a sample out and wait for it to cool it would pick up moisture like that so put it in ________.

a. an oven

b. a dessicator

c. at room temperature

d. fumehood

B.

Weighing to constant weight means a weighing difference of _____ using a calibrated analytical balance.

a. ±1.0 mg

b. ±0.01g

c. ±0.01mg

d. ±0.1mg

D.

The following are common desiccants except for _______

a. Calcium Sulfate

b. Ammonium Acetate

c. Calcium Chloride

d. Magnesium Oxide

B.

During ignition for ashing, muffle furnaces that go up to 1100 deg-C are used primarily for this and ________ is needed to contain the sample.

a. porcelain crucible

b. evaporating dish

c. beaker

d. all of the above

A.

In making standard solutions, ______ are used for measuring liquid with high accuracy.

a. beakers

b. volumetric flasks

c. Erlenmeyer flasks

d. Nesslers Tubes

B.

Used for distillation or heating of liquids, allows uniform heating.

a. round bottom flask

b. Erlenmeyer flask

c. test tube

d. Florence flask

A.

Most popular burettes are 10 mL, 25 mL and 50 mL types. Which has the highest resolution?

a. 25 mL

b. 10 mL

c. 50 mL

d. All of the above

C.

Used for vacuum filtration using filter paper.

a. gooch crucible

b. Buchner funnel

c. rotary evaporator

d. rubber aspirator

B.

In chromatography, ________ is carried out on glass plates or strips of plastic or metal coated on one side with a thin layer of adsorbent.

a. HPLC

b. GC

c. Paper Chromatography

d. Thin Layer Chromatography

D.

The nominal volume of water (or mercury) contained, or delivered by an article of volumetric glassware, at its reference temperature.

a. capacity

b. liter

c. mL

d. uL

A.

In verification of laboratory glassware, ________ is usually measured in terms of the tolerance, which is the uncertainty in a measurement made with the glassware. Class A volumetric glassware has a lower tolerance than Class B.

a. mean

b. accuracy

c. difference

d. precision

B.

Glass apparatus that are generally received with calibration certificates from suppliers.

a. Class B

b. Class A

c. Erlenmeyer flasks

d. Beaker

B.