Intermolecular Forces and Properties
According to the Beer-Lambert law, what factor can be modified to enhance the sensitivity of a measurement?
Increasing the solvent's light-absorbing properties.
Increased dilution of the less with water.
Decreasing the temperature of the solution during measurement.
Passing light at a range from the cuvette's spectral range.
If a scientist hypothesizes that the molar absorptivity of a colored solution changes with temperature, what experimental setup would best test this hypothesis while adhering to the Beer-Lambert Law?
Vary both the concentration and temperature simultaneously to observe changes in absorbance.
Record the emission spectra of the solution at one temperature after excitation at different wavelengths.
Measure absorbance at room temperature for different solutions with varying concentrations.
Measure absorbance at various temperatures using a single wavelength corresponding to the solution's maximum absorption.
The percent transmittance is the percentage of light ____.
not absorbed by the sample
emitted by the sample
reflected by the sample
absorbed by the sample
Derive the units of the molar absorption coefficient in the Beer-Lambert law given that the units of concentration are M and the units for the path length are cm.
1/M*m
mol/L*cm
mol/L*m
1/M*cm
What change should you expect in an experiment's results if there are impurities present that also absorb light at the wavelength used for analysis?
Reduced path length required for measurement
Increased apparent concentration of analyte
No effect on absorption measurements
Decreased actual concentration of analyte
How will leaving fingerprints on the cuvette affect the measured concentration of an unknown substance?
The measured concentration will be lower than the actual concentration.
The measured concentration will be greater than the actual concentration.
There is no effect on the calculated concentration.
The concentration of the substance cannot be determined at all.
What is represented by ε in A=εlc where A is absorbance?
Mass efficiency
Equilibrium constant
Electrical field strength
Molar absorptivity

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If a scientist wants to determine the concentration of copper(II) sulfate in a solution by measuring its absorbance, which color of light would be most appropriate for this measurement?
Red
Yellow
Blue-green
Violet
How would increasing the path length of a cuvette impact the absorbance measured for a solution with a fixed concentration according to the Beer-Lambert Law?
There would be no change in absorbance.
The absorbance would increase.
The concentration of the solution would decrease.
The absorbance would decrease.
Beer-Lambert law is not applicable if _____.
all of the above
polychromatic radiation is used
temperature changes
concentrated solution is used