Title: E1 Quiz
Course: Lab Instruments I > Section: E1: Meeting 1

This quiz covers the objectives for 1.1 - 1.4.

Have a periodic table or list of formula (molar) masses of the elements available before the quiz begins.

Q: A customer wants to know what the concentration of mercury is in a fish sample. This is an example of a situation requiring quantitative analysis.
- True
- False
A: True

Q: The major solution component is termed the solute.
- True
- False
A: False

Q: Which one of the following is the correct interpretation of 5% salt solution?
- 5 grams of salt for every 100 liters of solution
- 5 grams of salt for every 100 grams of solvent
- 5 grams of salt for every 100 milliliters of solution
- 5 milliliters of salt for every 100 milliliters of solvent
A: 5 grams of salt for every 100 milliliters of solution

Q: A solution is made by diluting 3.50 grams of sugar (C_6H_12O_6) to a final volume of 10.0 mL with water. What is the molar concentration of the solution made?
- 0.0194 M
- 0.0350 M _
- 0.350 M
- 1.94 M
A: 1.94 M

Q: A solution is made by diluting 150 mL of a 22 ppm aqueous mercury solution to 2.5 L with water. What is the parts per million concentration of mercury in the solution made?
- 0.37 ppm
- 1.3 ppm
- 370 ppm
- 1300 ppm
A: 1.3 ppm

Q: A chain of custody form must be filed when a sample is transferred from one laboratory to another in the same facility.
- True
- False
A: True

Q: Distilled water and deionized water are different terms for the same type of water.
- True
- False
A: False

Q: Which one of the following types of extractions utilizes a solid as the extracting agent?
- solid-liquid extraction
- liquid-liquid extraction
- solid phase extraction
- supercritical fluid extraction
A: solid phase extraction

Q: Which one of the following is considered a “last resort method” for preparing a solid sample for analysis?
- Acid digestion
- Extraction
- Fusion
- Grinding
A: Fusion

Q: The degree of reproducibility of a measurement is termed _____ and is most affected by _____ error.
- precision; random/indeterminate
- precision; systematic/determinate
- accuracy; random/indeterminate
- accuracy; systematic/determinate
A: precision; random/indeterminate

Q: Systematic errors can, theoretically, be identified and either eliminated or compensated for.
- True
- False
A: True

Q: Absolute error represents the difference between the mean of a data set and a given data point.
- True
- False
A: False

Q: Which one of the following is a potential source of random/indeterminate error?
- imprecise instrument
- contaminated reagent
- miscalibrated instrument
- unrepresentative random sample
A: imprecise instrument

Q: Choose the one statement that is true.
- The smaller the standard deviation, the more accurate the data set.
- The smaller the standard deviation, the less accurate the data set.
- The smaller the standard deviation, the more precise the data set.
- The smaller the standard deviation, the less precise the data set.
A: The smaller the standard deviation, the more precise the data set.

Q: The percentage of RSD for the mass data below is ____.

25.3 g, 25.5 g, 26.3 g, 25.7 g, 25.0 g, 26.0 g
- 1.4%
- 1.6%
- 1.8%
- 2.0%
A: 1.8%