Test Bank For - Reactions 1 st Edition By Kevin Revell (All Cha...

Test Bank For General Chemistry, Atoms to Reactions 1 st Edition By Kevin Revell (All Chapters 1- 22, 100% Original Verified, A+ Grade) All Chapters Arranged

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Chapter 22 Chemical Analysis

• Which piece of glassware would you use for precise volume measurements?
• beaker
• Erlenmeyer flask
• volumetric pipet
• dropper bottle
• round bottom

flask

ANSWER: c

• A calibration curve is used in chemical analysis to
• determine the precise volume of the analyte.
• convert the measured signal into the corresponding analyte concentration.
• identify the different components present in a mixture.
• calculate the detection limit of the method.
• measure the absorbance of a solution at different wavelengths.

ANSWER: b

• How would you report the volume of liquid dispensed by a 10-mL volumetric pipet?
• 10 mL
• 10.0 mL
• 10.00 mL
• 10.000 mL
• 10.0000 mL

ANSWER: c

• In chemical analysis, what is an analyte?
• The solution of known concentration used for comparison.
• The instrument used to measure the signal.
• The specific substance or component being measured or detected.
• The graph showing the relationship between signal and concentration.
• The process of preparing a sample for analysis.

ANSWER: c

• The detection limit of an analytical method is best defined as
• the maximum amount of an analyte that can be accurately measured.
• the minimum amount of an analyte that can be reliably distinguished from the

blank.

• the concentration of an analyte that produces a signal equal to the noise level.
• the range of analyte concentrations over which the method is accurate.
• the point at which the signal becomes saturated and no longer increases with

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Chapter 22 Chemical Analysis concentration.

ANSWER: b

• What does the saturation limit refer to in spectroscopy?
• The point at which the sample becomes cloudy and light scattering occurs.
• The minimum concentration of analyte that can be detected.
• The wavelength at which the analyte absorbs the most light.
• The maximum volume of solution that can be held in the cuvette.
• The point at which the absorbance no longer increases linearly with

concentration.

ANSWER: e

• The sensitivity region of an analytical method is characterized by
• a high degree of linearity between the signal and the analyte concentration.
• a low signal-to-noise ratio.
• a narrow range of analyte concentrations that can be measured.
• a high detection limit.
• a significant degree of interference from other substances.

ANSWER: a

• A chemist prepares a solution by dissolving 5.00 g of potassium permanganate (KMnO4) in enough water to

make 250.0 mL of solution. Next, they transferred 2.00-, 4.00-, 8.00-, and 10.00-mL aliquots of this solution to four 50.00-mL volumetric flasks and diluted to the mark with water. What is the concentration of the solution prepared with 2.00 mL of the stock solution?

• 0.126 M
• 0.00506

M

• 0.0101 M
• 0.00253

M

• 0.0202 M

ANSWER: b

• A biochemist prepares a 12.5-mM solution of potassium phosphate. They then transfer 1.00-, 2.00-, 4.00-,

and 6.00-mL aliquots from this solution to four separate 10.0-mL volumetric flasks, diluting each to the mark with water. What is the concentration of the solutions prepared with 4.00 mL of the stock solution?

• 1.25 mM
• 2.50 mM
• 5.00 mM
• 7.50 mM
• 10.0 mM

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Chapter 22 Chemical Analysis

ANSWER: c

• Which of the following R

2 values would signify that the data points match up with the function of the calibration curve the most?

• R

2

= 0.9987

• R

2

= 0.9925

• R

2

= 0.5000

• R

2

= 0.7824

• R

2

= 0.0012

ANSWER: a

• Which of the following R

2 values would signify an inaccurate calibration curve?

• R

2

= 0.9912

• R

2

= 0.9937

• R

2

= 0.9931

• R

2

= 0.9401

• R

2

= 1.0000

ANSWER: d

• What instrument can measure the mass of chemicals accurately, usually to the nearest 0.1 mg?

ANSWER: electronic balance

• A solution is prepared by dissolving 7.50 g of ammonium nitrate (NH4NO3) in enough water to make 200.0

mL of solution. A chemist then takes 1.00-, 3.00-, 5.00-, and 7.00-mL aliquots from this solution and transfers them to four different 100.0-mL volumetric flasks, diluting each to the mark with water. Determine the concentration of each resulting solution in mM.

ANSWER: Stock Volume (mL) Concentration (mM)

1.00 4.69

3.00 14.1

5.0023.43

7.00 32.8

• A chemist prepares a 0.500-M stock solution of glucose. They need to produce four standard solutions with

concentrations of 0.100 M, 0.200 M, 0.300 M, and 0.400 M, each with a final volume of 25.0 mL. What volume of the stock solution should be used to prepare each of the standard solutions?

ANSWER: Concentration (M) Volume (mL)

0.1005.00

0.20010.0

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