CHEM 101L QUESTIONS AND ANSWERS
Convert measured quantities (mass, volume, etc.) to chemically-relevant
quantities (moles, concentration, etc.) as needed in an experiment.
M=m/v(L)
M1V1=M2V2
Understand how to convert from a mathematical equation to a graph of a linear
function and how to use regression data to find terms and constants in the
equation.
Define and distinguish between random and systematic errors and how they may
affect precision and accuracy of experimental results.
- Systematic errors are errors that affect the accuracy of a measurement. in the
absence of other types of errors, repeated measurements yield results that differ from
the true or accepted value by the same amount. The accuracy of cannot be improved by
repeating those measurements.
- Random errors are errors that affect the precision of a measurement. in the absence
of other types of errors, repeated measurements yield
results that fluctuate above and below the true or accepted value. Measurements differ
from each other due to random, unpredictable variations in the measurement process.
The precision of measurements errors can be improved by repeating those
measurements.
Calculate standard deviation and understand the importance and relevance with
respect to a specific experiment.
- Assesses precision
- Used in Exp 1, Exp 8
Calculate Mean
- Assesses precision
- If errors are random then the mean is more accurate than any 1 value
Calculate CV and understand the importance and relevance with respect to a
specific experiment.
- Assesses precision as a percentage of the value measured
- Used in Exp 1, Exp 8
Calculate % error and understand the importance and relevance with respect to a
specific experiment.
- Assesses accuracy
- Used in Exp 1, Exp 6, Exp 7, Exp 8
Anticipate inherent uncertainties and source of error in an experimental setup
and predict the impact of those errors on the results of a determination.
Understand correct use, application, and interpretation of significant figures in
measuring devices and in calculations
Interpret graphical results to identify most likely sources of uncertainty.
h. Understand correct use of specific laboratory equipment:
i. Temperature probes/thermometers
ii. Graduated pipette/bulb
iii. Stir plate/hot plate
Convert measured quantities (mass, volume, etc.) to chemically-relevant
quantities (moles, concentration, etc.) as needed in an experiment.
M=m/v(L)
M1V1=M2V2
Understand how to convert from a mathematical equation to a graph of a linear
function and how to use regression data to find terms and constants in the
equation.
Define and distinguish between random and systematic errors and how they may
affect precision and accuracy of experimental results.
- Systematic errors are errors that affect the accuracy of a measurement. in the
absence of other types of errors, repeated measurements yield results that differ from
the true or accepted value by the same amount. The accuracy of cannot be improved by
repeating those measurements.
- Random errors are errors that affect the precision of a measurement. in the absence
of other types of errors, repeated measurements yield
results that fluctuate above and below the true or accepted value. Measurements differ
from each other due to random, unpredictable variations in the measurement process.
The precision of measurements errors can be improved by repeating those
measurements.
Calculate standard deviation and understand the importance and relevance with
respect to a specific experiment.
- Assesses precision
- Used in Exp 1, Exp 8
Calculate Mean
- Assesses precision
- If errors are random then the mean is more accurate than any 1 value
Calculate CV and understand the importance and relevance with respect to a
specific experiment.
- Assesses precision as a percentage of the value measured
- Used in Exp 1, Exp 8
Calculate % error and understand the importance and relevance with respect to a
specific experiment.
- Assesses accuracy
- Used in Exp 1, Exp 6, Exp 7, Exp 8
Anticipate inherent uncertainties and source of error in an experimental setup
and predict the impact of those errors on the results of a determination.
Understand correct use, application, and interpretation of significant figures in
measuring devices and in calculations
Interpret graphical results to identify most likely sources of uncertainty.
h. Understand correct use of specific laboratory equipment:
i. Temperature probes/thermometers
ii. Graduated pipette/bulb
iii. Stir plate/hot plate
