1. In particular gravimetric analysis, the C. Higher result than correct value.
precipitate of bariums ulfate was
weighed before it was completely
dried. The likely impact of this error
on the calculated result is.
A. Minimal, because the mass of wa-
ter is very low.
B. Lower result than correct value.
C. Higher result than correct value.
D. Minimal, because calculation as-
sumes a hydrated sample is pro-
duced.
E. All of the above are not correct.
2. Atomic spectroscopy is... A. Measurement of intensity of emit-
ted light at a particular wavelength
A. Measurement of intensity of emit- from the atoms that are excited
ted light at a particular wavelength thermally.
from the atoms that are excited ther-
mally.
B. Measurement of absorbance of
emitted light at particular wavelength
from atoms excited thermally.
C. Measurement of intensity of emit-
ted light at particular wavelength
from the atoms that are excited by
monochromatic light.
D. Measurement of intensity of ab-
sorbed light at a particular wave-
length from the atoms that are excited
thermally.
, CHEM 210 FINAL EXAM
E. None of the above.
3. In many countries, fish with more D. The concentration of mercury in
than 0.500 ppm mercury is consid- the tuna is greater than 0.500 ppm
ered unsafe. In one experiment, a and it should not be eaten.
0.750 g piece of tuna was appropriate-
ly treated and made up to 10.0 mL so-
lution. This solution returned an ab-
sorbance of 0.70. Using the calibra-
tion graph below, what can be con-
cluded from this analysis?
A. The tuna does not contain mercury.
B. The concentration of mercury in
the tuna is less than 0.500 ppm and
it can be eaten safely.
C. The concentration of mercury is ex-
actly equal to 0.500 ppm and may or
may not be safe to eat.
D. The concentration of mercury in
the tuna is greater than 0.500 ppm
and it should not be eaten.
E. None of the above.
4. Of the following compounds, which A. Methanol (CH3OH)
would you expect to elute first from
a nonpolar gas chromatographic col-
umn?
A. Methanol (CH3OH)
B. Ethanol (CH3CH2OH)
C. n-Propanol (CH3CH2CH2OH) D.
n-Butanol (CH3CH2CH2CH2OH)
, CHEM 210 FINAL EXAM
E. n-Pentanol
(CH3CH2CH2CH2CH2OH)
5. Separation of ions in mass spectrom- D) Mass to charge ratio
eter take place on the basis of which
of the following?
A) Mass
B) Charge
C) Molecular weight
D) Mass to charge ratio
E) None of the above.
6. Which of the following are examples D. II and III only
of systematic errors?
I. Weighing a precipitate on an elec-
tronic balance.
II. Consistently reading burette vol-
umes from the top of the meniscus.
III. Using an incorrectly labelled stan-
dard solution in a titration.
A. I, II and III
B. I and III only
C. I and II only
D. II and III only
E. III only
7. What is the molar concentration and B. 0.201± 0.001 mol/L
absolute uncertainty of a solution
made by dissolving 1.065 ± 0.001 g of
Na2CO3 in 50.0 ± 0.3 mL of distilled
water?
A. 0.201± 0.050 mol/L
B. 0.201± 0.001 mol/L
C. 0.201± 0.301 mol/L
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller CodedNurse. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $22.99. You're not tied to anything after your purchase.
