CHEM 210 FINAL EXAM
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
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
