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You should AVERAGE answering each question in less than 100 seconds for this exam Note: All of the following questions contain only one best answer. Circle the letter that best corresponds with the question. |
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Lab Apparatus Reagents Techniques
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1 |
Sodium hydroxide should be stored in |
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a. |
polyethylene bottle |
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b. |
graduated cylinder with a stopper |
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c. |
borosilicate bottle |
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d. |
beaker covered with paraffin |
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2 |
Which of the following would not be considered volumetric glassware? |
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a. |
Graduated cylinders |
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b. |
Bottles |
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c. |
Pipets |
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d. |
Burets |
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3 |
"TC" means |
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a. |
a volumetric pipet |
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b. |
to deliver a known volume |
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c. |
to contain |
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d. |
both a. & b. |
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4 |
Which of the following will contribute to errors when using buret? |
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a. |
Drying a buret that has been cleaned |
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b. |
Rinsing it out with a small volume of the solution with which it is to be filled |
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c. |
Emptying a 50 ml buret faster than 0.7 ml/s |
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d. |
Both a. & c. |
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5 |
It is never necessary to recalibrate Class "A" glassware |
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a. |
True |
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b. |
False |
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c. |
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d. |
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6 |
Fritted glassware is |
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a. |
porous |
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b. |
used for gas dispersion |
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c. |
both a. & b |
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d. |
none of the above |
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7 |
These are used to deliver accurate volumes and range in size from 0.1 mL to 100 mL |
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a. |
Beaker |
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b. |
Graduated Cylinder |
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c. |
Pipet |
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d. |
Adjustable pipettor |
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8 |
Beakers are used for |
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a. |
measuring volumes |
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b. |
mixing chemicals |
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c. |
delivering accurate volumes |
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d. |
delivering and measuring accurate volumes used in titrations |
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9 |
Pipets used to deliver a single volume are |
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a. |
graduated pipets |
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b. |
volumetric pipets |
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c. |
serological pipets |
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d. |
milk pipets |
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10 |
Which pipet should never be "blown out" |
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a. |
Graduated pipets |
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b. |
Volumetric pipets |
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c. |
Serological pipets |
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d. |
milk pipets |
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11 |
Pipets which require the small amount of liquid remaining in the tip to be blown out, are identified by |
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a. |
the letters "TC" near the top of the pipet |
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b. |
The letters "TD" near the top of the pipet |
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c. |
a frosted band near the top of the pipet |
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d. |
either a or b |
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12 |
Accurately calibrated glass ware for precise measurements of volume is known as |
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a. |
graduated glassware |
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b. |
volumetric glassware |
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c. |
borosilicate glassware |
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d. |
corning glassware |
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13 |
To correctly read volumetric glassware, which par to the meniscus should be tangent to the calibration mark when viewed at eye level? |
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a. |
Bottom |
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b. |
Top |
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c. |
Middle |
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d. |
either a or b |
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14 |
The correct procedure for delivering a solution from a volumetric pipet is to hold the pipet vertically and |
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a. |
Keep the tip of the pipet in contact with the receiving vessel for several seconds after the free flow of liquid has stopped |
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b. |
blow out the pipet after the free flow of liquid has stopped |
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c. |
shake any droplets from the tip of the pipet into the receiving vessel after the free flow of liquid has stopped |
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d. |
blow out the pipet during the delivery of the liquid |
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15 |
When titrating with a 50 mL buret, the titrant should be emptied at a rate of 0.7 mL per second or slower because if the titrant is emptied too fast |
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a. |
you may overshoot the intended endpoint |
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b. |
the pH electrode may not respond fast enough to the addition of the titrant |
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c. |
it may cause loss of sample or titrant because of splashing |
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d. |
too much titrant will adhere to the walls of the buret and as the solution drains down, the meniscus will gradually rise, giving a high false reading |
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16 |
All glassware used to deliver liquids must be absolutely clean so that as the vessel is emptied, the film of liquid coating the inside of the delivery vessel never breaks at any point. This is known as |
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a. |
draining action |
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b. |
film action |
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c. |
sheeting action |
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d. |
delivery action |
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17 |
The correct procedure to prepare a buret for use just after cleaning with soap and water is to |
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a. |
dry the buret with compressed air |
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b. |
dry the buret with any inert gas |
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c. |
rinse the buret with acetone |
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d. |
rinse the buret two to three times with a small volume of the solution with which it is to be filled |
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18 |
Laboratory glassware that meets the Federal specification for certified glassware is designated as |
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a. |
class A |
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b. |
class B |
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c. |
class C |
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d. |
TD or TC |
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19 |
Laboratory chemicals and reagents are available in a wide variety of grades of purity. Which grade of chemical is recommended for general laboratory use? |
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a. |
Technical grade |
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b. |
Analytical reagent grade |
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c. |
Pure grade |
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d. |
Ultra pure grade |
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20 |
All anhydrous reagent chemicals used for making standard calibration solutions and titrants must be prepared prior to use by |
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a. |
drying overnight in a desiccator |
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b. |
drying in an oven at 305 to 310 ºC for at least 1 to 2 hours and desiccating overnight |
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c. |
drying in an oven at 305 to 310 ºC for at least 1 to 2 hours and desiccating overnight, and cooling to room temperature in a desiccator |
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d. |
drying in an oven at 105 to 110 ºC for at least 1 to 2 hours and desiccating overnight, and cooling to room temperature in a desiccator |
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21 |
It is necessary to verify the concentration of stored standard solutions because |
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a. |
bottles that are opened often are subject to evaporation |
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b. |
some chemical solutions are less stable than others |
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c. |
storage and preservation conditions affect standard quality and life |
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d. |
all of the above |
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22 |
In additive solutions (a + b), the first number, a, refers to the volume of concentrated reagent. the second number, b, refers to |
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a. |
the volume of 95% ethyl alcohol required for dilution |
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b. |
the volume of distilled water required for dilution |
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c. |
the volume of 50/50 HCl required for dilution |
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d. |
none of the above |
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23 |
The proper filter for use in the Total Suspended Solids analysis is? |
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a. |
47 mm filter disk |
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b. |
Glass fiber filter with organic binder |
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c. |
Glass fiber filter without organic binder |
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d. |
less than .2 micron filter disk |
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24 |
Some commercial thermometers may be in error by as much as? |
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a. |
one degree C |
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b. |
two degrees C |
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c. |
three degrees C |
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d. |
four degrees C |
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25 |
How should you dry volumetric glassware? |
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a. |
In a hot oven |
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b. |
In a muffle furnace |
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c. |
At room temperature |
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d. |
None of the above |
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26 |
You remove too much reagent from the bottle when making a solution, you should |
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a. |
return excess reagent to the bottle |
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b. |
pour the excess reagent down the drain and throw the bottle in the garbage |
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c. |
save the excess reagent in another container and store somewhere |
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d. |
dispose of excess reagent according to the label |
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27 |
Distilled water is best defined as |
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a. |
electrically heated or steam-heated water with a conductance of less than 1 microsiemen |
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b. |
water filtered through several beds of resin cartridges. |
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c. |
water that is heated, passed through resin cartridges including an activated carbon filter and a membrane filter. |
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d. |
none of the above |
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28 |
When reading a buret, the eye must be level to the meniscus of the liquid to eliminate what? |
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a. |
Parallax errors |
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b. |
Refractive index changes |
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c. |
Calibration errors |
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d. |
both b and c |
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29 |
What is the most common piece of laboratory equipment? |
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a. |
Beaker |
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b. |
Graduated cylinder |
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c. |
Pipet |
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d. |
Volumetric flask |
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30 |
Which flask gives you the most accurate measurement? |
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a. |
Volumetric flask |
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b. |
Erlenmeyer flask |
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c. |
Kjeldahl flask |
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d. |
Filtering flask |
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31 |
A desiccator is used to |
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a. |
evaporate the moisture from the samples. |
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b. |
filter the suspended solids |
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c. |
prevent moisture from entering the sample |
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d. |
weigh the solids to the nearest ten thousandth gram |
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32 |
Which type of tubing is most chemically inert? |
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a. |
Teflon |
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b. |
Polypropylene |
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c. |
Tygon |
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d. |
Copper |
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33 |
What law pertains to how a spectrophotometer works? |
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a. |
Boyles |
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b. |
Dumas |
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c. |
Beer's |
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d. |
None of the above |
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34 |
What is the Imhoff cone used to determine? |
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a. |
Total dissolved solids |
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b. |
Total suspended solids |
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c. |
Total organic carbons |
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d. |
Settleable solids |
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35 |
An Imhoff cone measures |
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a. |
suspended solids in mg/L |
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b. |
settleable solids in mg/L |
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c. |
settleable solids in mL/L |
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d. |
dissolved solids in mg/L |
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36 |
When establishing a standard curve for spectrophotometric analysis, how should standard and blanks be treated? |
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a. |
As samples, using complete method of analysis |
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b. |
There's no reason to worry about how analysis is performed |
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c. |
With special care, no need for preliminary treatment |
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d. |
As special samples apart from regular analysis |
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37 |
A micro-buret is a buret which is graduated in |
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a. |
hundredths of a milliliter division |
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b. |
thousandths of a milliliter division |
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c. |
tenths of a milliliter division |
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d. |
any of the above |
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38 |
Changes in ambient temperature result in changes in the capacity of volumetric glassware. Most volumetric glassware is calibrated to a specific volume at a specific temperature and solutions should be measured at this temperature. This temperature is |
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a. |
28 ºC |
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b. |
25 ºC |
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c. |
22 ºC |
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d. |
20 ºC |
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39 |
For bacteriological examination of samples, reagent water should be tested for conductivity, pH, heavy metals, ammonia and organic nitrogen, total chlorine residual, heterotrophic plate count, total organic carbon with |
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a. |
BOD |
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b. |
oxidized nitrogen |
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c. |
a water quality and a use test |
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d. |
COD |
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40 |
Reagent grade water specifications Type I, Type II, and Type III indicate that |
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a. |
type I is the lowest reagent grade |
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b. |
Type III is the highest reagent grade |
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c. |
type II is preferably bacteria free |
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d. |
type I has no detectable concentration of the compound to be analyzed |
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41 |
The indicators of reagent grade water are bacteria, pH, particulate matter, resistivity/conductivity and |
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a. |
iron |
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b. |
SiO2 |
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c. |
Turbidity |
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d. |
alkalinity |
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42 |
Which of the following is not part of an atomic absorption spectrophotometer? |
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a. |
Column |
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b. |
Nebulizer |
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c. |
Detector |
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d. |
Burner Head |
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