CHEM 210 FINAL EXAM QUESTIONS AND CORRECT ANSWERS, COMPLETE SOLUTION 2026/2027

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.