Title: E4 Quiz
Course: Lab Instruments I > Section: E4: Meeting 8

This quiz covers the objectives for Experiment Set 4.

Q: Wet chemical analysis and instrumental analysis have some commonalities. Which one of the following is exclusive to instrumental analysis?
- Instrumentation utilized must be calibrated.
- Standardized solutions are typically employed.
- Data obtained is an electrical signal derived from a property of the analyte.
- Sample must be representative and prepared using quantitative techniques.
A: Data obtained is an electrical signal derived from a property of the analyte.

Q: Which of the following parts of an analytical instrument is responsible for amplifying the signal?
- Power supply
- Readout device
- Sensor
- Signal processor
A: Sensor

Q: Which one of the following is NOT an instrumental analysis technique?
- Titrimetric
- Chromatographic
- Spectrochemical
- Electroanalytical
A: Titrimetric

Q: When the calibration of an instrument is off, it should be removed from service for repair or discard.
- True
- False
A: False

Q: A positive value for a calibration constant indicates that as the analyte concentration in a solution increases, the readout signal also increases.
- True
- False
A: True

Q: The calibration constant for an analyte can be established using either the single standard method or the series of standards method.
- True
- False
A: True

Q: A standard curve is generated by combining the single standard method of calibration results from different experiments.
- True
- False
A: False

Q: A reagent blank is made with all the same reagents as the standards, except the analyte, which is not included.
- True
- False
A: True

Q: The more precise the data, the smaller the correlation coefficient (r).
- True
- False
A: False

Q: Which of the following describes preparing standards by serial dilution?
- Each standard is made by diluting the same volume of different stock solutions.
- Each standard is made by diluting different volumes of the same stock solution.
- Each standard is made by diluting an aliquot of the previously made standard solution.
- Each standard is made by diluting the entire volume of the previously made standard solution.
A: Each standard is made by diluting an aliquot of the previously made standard solution.

Q: Which one of the following defines the purpose of a control solution in an instrumental analysis experiment?
- Establish relationship between background signal and concentration
- Establish relationship between analyte signal and concentration
- Establish accuracy of concentrations of standard solutions
- Establish precision of concentrations of analyte solutions
A: Establish accuracy of concentrations of standard solutions

Q: Which one of the following is a method used to generate the best fit straight line for a series of data points?
- Linear expansion
- Linear regression
- Method of greatest squares
- Method of least differences
A: Linear regression

Q: A standard curve from a plot of analyte signal (y-axis) versus concentration (x-axis) is described by the equation y = 0.331x – 0.07. What is the concentration of the analytical sample that gives a signal of 0.87?
- 0.66
- 1.1
- 2.7
- 2.8
A: 2.8

Q: What volume of 1.50 M Standard A is needed to prepare 10.0 mL of 1.25 M Standard B?
- 0.19 mL
- 6.5 mL
- 8.3 mL
- 12 mL
A: 8.3 mL

Q: A 4.510 g soil sample is extracted with 50.00 mL of water and diluted to 250.00 mL. The concentration of analyte in this diluted sample was found to be 12.9 ppm. What is the analyte concentration in the original soil sample?
- 0.572 ppm
- 14.3 ppm
- 232 ppm
- 715 ppm
A: 715 ppm