Exam 1 Flashcards
The supernatant refers to the solid particles that settle at the bottom of a container after a liquid has been centrifuged.
a. True
b. False
b. false
Quantitative analysis is a method used to determine the exact amount or concentration of a substance in a sample.
a. True
b. False
a. True
An aliquot refers to a portion of a larger whole, especially a sample taken for chemical analysis or other treatment.
a. True
b. False
a. True
Significant figures are the digits in a number that contribute to its precision, excluding any leading zeros.
a. True
b. False
a. True
Buoyancy is the force that causes objects to sink in a fluid.
a. True
b. False
b. False
Parallax error occurs when the measurements of an object’s length appears different due to the observer’s change in position.
a. True
b. False
b. False
The Q-test is used to determine if a specific data point can be considered an outlier in a set of data.
a. True
b. False
a. True
The F-test is used to compare the variance of two or more sets of data to see if they come from populations with the same standard deviation.
a. True
b. False
a. True
Which of the following best describes the primary purpose of the student t-test?
a. To compare the variances of two sets of data.
b. To determine if there is a significant difference between the means of two unrelated groups.
c. To identify outliers in a single set of data.
b. To determine if there is a significant difference between the means of two unrelated groups.
Define the term precision.
a. Precision refers to how close a measured value is to the “true” value.
b. Precision refers to how “accurately” a given measurement is made.
a. Precision refers to how close a measured value is to the “true” value.
Which of the following is classified as a determinate/systematic error?
a. A balance is incorrect and increasing in value by a constant amount of 0.10 g.
b. A blank used to correct for background interference is accidentally contaminated with the analyte.
c. none of the above options is correct.
a. A balance is incorrect and increasing in value by a constant amount of 0.10g
Variance, variation coefficient and the standard deviation are parameters used to measure:
a. method accuracy
b. method precision
c. none of the above
b. method precision
Which statement is correct?
a. Adsorption in involves penetration beyond the surface to the inside.
b. Absorption means attachment to the surface.
c. Adsorption means attachment to the surface.
c. Adsorption means attachment to the surface.
The following hemoglobin concentrations (mg/mL) were found in 5 blood samples, with one of the following values being questionable: 12.5, 12.8, 12.6, 12.7, 13.9. Indicate the questionable value:
a. 12.5
b. 12.7
c. 13.9
c. 13.9
A systematic error
a. Can be discovered and corrected.
b. Arises from the human limitations on the ability to make a physical measurement.
c. Is also known as an indeterminate error.
a. can be discovered and corrected
