Physics Unit 1 To 9 Chapters Reading MCQ Questions Help

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I uploaded the questions and the chapters needed.

two of the question are short answer essay i need only no more than 4 sentences.

25 questions are multiple choice the other two are short essay answer.

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doctoreverlyne
School: Boston College

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QUESTION 1
1. If the pre-sampling flow rate is 200 mL/min, what is the range for the post-sampling flow rate
(post-sampling flow rate should be within ±5%)?
a. 190 to 210 cm3/min.
b. 190 to 210 mL/min.
c. All answers correct.
d. 0.190 to 0.210 L/min.
QUESTION 2
1. A 0.036 m 3 volume of air was sampled for acetone vapor (MW = 58 g/mol) using a low-ﬂow air
sampling pump connected to a standard charcoal tube as an adsorbent medium. Laboratory
analysis of the front and backup sections of the charcoal tube using GC indicated that a total of
0.6 mg acetone was reported from the lab analysis. What was the concentration (ppm) of acetone
vapor in the air during the sampling period, assuming normal temperature (25°C) and pressure
(760 mmHg)? Hint: Follow example 9.3 from the textbook.
Show your work for maximum points possible.
0.036m3=36L
C=n/v
0.0006g/ (58/mol) = 1.03448*10-5mol
1.03448*10-5mol/36L=2.87*10-7mol/L(Kotzian, 2016)

QUESTION 3
1. Rotameters, used as secondary calibrators are ...
a. ... Flow rate meters.
b. ... Volume meters.
c. ... Velocity meters.
d. All answers correct.

QUESTION 4
1. In air sampling for halogenated hydrocarbons using sorbent tubes ...
a. ... PVC-filter is used since halogenated hydrocarbons are non-polar compounds.
b. All answers correct.

c. ... Activated charcoal or silica gel can be used as a sorbent material, polarity of the
molecules is not an important factor.
d. ... Silica gel is used since halogenated hydrocarbons are polar compounds.

QUESTION 5
1. In air sampling for benzene and toluene u...

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Anonymous
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