CHEM 1120 Lab 3 Study Guide | Chemistry Lab Review, Concepts &
Practice Questions
Identify the color absorbed by a solution that should appear as the given color.
Orange -------------->Blue
Green ------------------> Red
Red------------->Green
Blue ------------> Orange - The color that an object appears is complementary to the color
absorbed by the object.
An object that appears one color absorbs light at the wavelength range of the color directly
across from it on the color wheel.
Arrange the colors of the visible spectrum in order from highest to lowest energy. - violet -
Highest energy
blue
green
yellow
orange
red - Lowest energy
The visible spectrum includes light with wavelengths from approximately 400 nm to 700 nm.
This range includes all colors that can be seen by the human eye.
Energy is inversely proportional to wavelength. The color violet includes light with the shortest
wavelengths, and therefore has the highest energy. The color red includes light with the longest
wavelengths, and therefore has the lowest energy.
, Identify the possible issues if a sample in a spectrophotometer gives no reading. - The sample
may be placed improperly in the cuvette holder.
The wrong wavelength may be set.
There may be an issue with the composition of the sample.
There may be an issue with the spectrophotometer.
When light cannot travel as expected through the sample in a spectrophotometer, there will be
no reading. This can occur if there are issues with either the sample or the instrument.
If a sample is too dilute or placed incorrectly in the spectrophometer, for example, it cannot be
measured. If the wrong wavelength is set or if there are issues with the instrument, the
measurement will also be affected.
Consider the pictured representations of electromagnetic waves.
Which electromagnetic wave corresponds to each description?
Shortest wavelength
Lowest frequency
Highest energy
Second Highest energy - B
C
B
A
Practice Questions
Identify the color absorbed by a solution that should appear as the given color.
Orange -------------->Blue
Green ------------------> Red
Red------------->Green
Blue ------------> Orange - The color that an object appears is complementary to the color
absorbed by the object.
An object that appears one color absorbs light at the wavelength range of the color directly
across from it on the color wheel.
Arrange the colors of the visible spectrum in order from highest to lowest energy. - violet -
Highest energy
blue
green
yellow
orange
red - Lowest energy
The visible spectrum includes light with wavelengths from approximately 400 nm to 700 nm.
This range includes all colors that can be seen by the human eye.
Energy is inversely proportional to wavelength. The color violet includes light with the shortest
wavelengths, and therefore has the highest energy. The color red includes light with the longest
wavelengths, and therefore has the lowest energy.
, Identify the possible issues if a sample in a spectrophotometer gives no reading. - The sample
may be placed improperly in the cuvette holder.
The wrong wavelength may be set.
There may be an issue with the composition of the sample.
There may be an issue with the spectrophotometer.
When light cannot travel as expected through the sample in a spectrophotometer, there will be
no reading. This can occur if there are issues with either the sample or the instrument.
If a sample is too dilute or placed incorrectly in the spectrophometer, for example, it cannot be
measured. If the wrong wavelength is set or if there are issues with the instrument, the
measurement will also be affected.
Consider the pictured representations of electromagnetic waves.
Which electromagnetic wave corresponds to each description?
Shortest wavelength
Lowest frequency
Highest energy
Second Highest energy - B
C
B
A
