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CHEM 210 FINAL EXAM QUESTIONS AND CORRECT ANSWERS, COMPLETE SOLUTION 2024.
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CHEM 210 FINAL EXAM QUESTIONS AND CORRECT ANSWERS, COMPLETE SOLUTION 2024. In particular gravimetric analysis, the 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 water is ve...

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  • June 7, 2024
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  • 2023/2024
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CHEM 210 FINAL EXAM QUESTIONS AND
CORRECT ANSWERS, COMPLETE SOLUTION 2024.
In particular gravimetric analysis, the 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 water is very low.

B. Lower result than correct value.

C. Higher result than correct value.

D. Minimal, because calculation assumes a hydrated sample is produced.

E. All of the above are not correct.
C. Higher result than correct value.
Atomic spectroscopy is...

A. Measurement of intensity of emitted light at a particular wavelength from the
atoms that are excited thermally.

B. Measurement of absorbance of emitted light at particular wavelength from
atoms excited thermally.

C. Measurement of intensity of emitted light at particular wavelength from the
atoms that are excited by monochromatic light.

D. Measurement of intensity of absorbed light at a particular wavelength from the
atoms that are excited thermally.

E. None of the above.
A. Measurement of intensity of emitted light at a particular wavelength from the atoms
that are excited thermally.
In many countries, fish with more than 0.500 ppm mercury is considered unsafe.
In one experiment, a 0.750 g piece of tuna was appropriately treated and made up
to 10.0 mL solution. This solution returned an absorbance of 0.70. Using the
calibration graph below, what can be concluded 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 exactly 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.
D. The concentration of mercury in the tuna is greater than 0.500 ppm and it should not
be eaten.
Of the following compounds, which would you expect to elute first from a
nonpolar gas chromatographic column?

A. Methanol (CH3OH)
B. Ethanol (CH3CH2OH)
C. n-Propanol (CH3CH2CH2OH) D. n-Butanol (CH3CH2CH2CH2OH)
E. n-Pentanol (CH3CH2CH2CH2CH2OH)
A. Methanol (CH3OH)
Separation of ions in mass spectrometer 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.
D) Mass to charge ratio
Which of the following are examples of systematic errors?

I. Weighing a precipitate on an electronic balance.
II. Consistently reading burette volumes from the top of the meniscus.
III. Using an incorrectly labelled standard 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
D. II and III only
What is the molar concentration and 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
D. 0.201± 0.694 mol/L
E. None of these

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