Answers3262 CR Physics B 2526Unit Test

Atomic Spectra Answers

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The emission spectrum of the element lithium is shown below.What is the best estimate of the color that will be seen when a sample of lithium gas absorbs a lot of energy?

Question illustration
A
mix of blue and green
B
mix of red and orange
C
mix of yellow and green
D
pure yellow
2
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Which statement is part of Bohr's atomic model?

A
Electrons absorb or emit light when they change energy levels.
B
Electrons with the highest energy are found with orbits of the smallest radius.
C
Electrons exist as waves and clouds of probability with specific orbits and shapes.
D
Electrons orbit the nucleus in narrow ellipses, like how the planets orbit the Sun.
3

What are characteristics of absorption spectra? Select 3 options.

A
Light is absorbed, which produces characteristic lines.
B
Light is emitted, which produces characteristic lines.
C
Lines are dark on a visible light background.
D
Lines are brightly colored on a black background.
E
Lines are produced by electrons being excited.
F
Lines are produced from electrons returning to a lower energy level.
4

J.J. Thompson is credited with discovering the

A
proton.
B
electron.
C
neutron.
D
nucleus.
5

The emission spectrum of iodine is shown below.Which is the absorption spectrum?

Question illustration
A
A line spectra with 4 purple lines, 6 blue lines, 3 light blue lines, 5 green-blue lines, 6 green lines, 7 yellow lines, 3 orange lines and 14 red lines.
Option A
B
A line spectra with 6 purple lines, 9 blue lines, 6 light blue lines, 3 green-blue lines, 6 green lines, 2 yellow lines, 5 orange lines and 10 red lines.
Option B
C
A line spectra with 2 black lines in purple, 6 black lines in blue, 3 black lines in light blue, 1 black line in green-blue, 10 black lines in green, 8 black lines in yellow, 6 black lines in orange and 8 black lines in red.
Option C
D
A line spectra with 4 black lines in purple, 8 black lines in blue, 6 black lines in light blue, 3 black line in green-blue, 10 black lines in green, 4 black lines in yellow, 4 black lines in orange and 12 black lines in red.
Option D
6

The table below shows the wavelengths of visible light that correspond to different colors.A student analyzes the emission spectrum of an unknown element and observes strong lines at the following wavelengths: 656 nm, 486 nm, 434 nm.Which absorption spectrum is the student most likely viewing?

Question illustration
A
A line spectrum with one black line in purple, blue, light blue and red.
Option A
B
A line spectrum with 3 black lines in purple, one black line in blue, 2 black lines in light blue, one black line in orange and one black line in orange-red.
Option B
C
A line spectrum with 3 black lines in purple, 2 black lines in blue, 2 black lines in light blue, one black line in green and one black line in yellow.
Option C
D
A line spectrum with 4 black lines in blue, 6 black lines in green, 3 black lines in yellow and one black line in orange.
Option D
7

An absorption spectrum of oxygen is shown below.What is most likely the emission spectrum of oxygen?

Question illustration
A
A rainbow for a line spectra. There are 4 lines in purple, 4 lines in blue, 3 lines in blue-green, 6 lines in the yellow, 4 lines in the orange and 15 lines in red.
Option A
B
A rainbow for a line spectra. There are 4 lines in purple, 4 lines in blue, 3 lines in blue-green, 7 lines in the green, 6 lines in the yellow, 5 lines in the orange and 10 lines in red.
Option B
C
A rainbow for a line spectra. There are 4 lines in purple, 4 lines in blue, 2 lines in blue-green, 4 lines in the green, 2 lines in the yellow, 3 lines in the orange and 4 lines in red.
Option C
D
A rainbow for a line spectra. There are 5 lines in purple, 6 lines in blue, 1 line in blue-green, 4 lines in the green, 3 lines in the yellow, 4 lines in the orange and 4 lines in red.
Option D
8

This image shows a stream of positively charged particles being directed at gold foil. The positively charged particles are called "alpha particles” and each one is like a nucleus without any electrons.

Question illustration
A
Alpha particles are mostly empty space, so they move in random directions, and one of these alpha particles can strike point X.
B
The gold atoms contain negative electrons, so when alpha particles strike the gold they keep moving but in various directions.
C
If an alpha particle hits the gold foil, a gold nucleus splits and a particle from it flies out at point X.
D
When the dense, positive alpha particle passes close to a positive nucleus of gold, the alpha particle repels and hits the screen at point X.
9

The bright light emission spectrums below are seen through a spectroscope. The unknown sample is a mixture of the observed gases.Which gases are found in the unknown sample?

Question illustration
A
gases W and Z
B
gases X and Y
C
gases W and Y
D
gases Z and Y
10

Changes in the appearance of emission and absorption spectrums are caused by the activities of

A
protons.
B
electrons.
C
neutrons.
D
neutrinos.
11

Which best explains what happens when an electron moves from an excited state to the ground state?

A
The electron absorbs energy as it moves to a lower energy level.
B
The electron absorbs energy as it moves to a higher energy level.
C
The electron releases energy as it moves to a higher energy level.
D
The electron releases energy as it moves to a lower energy level.
12

What causes the appearance of lines in an emission spectrum?

A
Light is absorbed as an electron moves to a higher energy state.
B
Light is released as an electron moves to a lower energy state.
C
An electron is released as light when it moves to a lower energy state.
D
An electron is released as light when it moves to a higher energy state.
13

A table of the visible light spectrum is shown below.Tyrone analyzes the emission spectrum of an unknown element. He observes two discrete lines at 600 nm and 650 nm, and he sees many lines corresponding to shorter wavelengths, with the strongest line being at 475 nm.Which emission spectrum is Tyrone most likely analyzing?

Question illustration
A
A line spectrum with one black line in purple, blue, light blue and red.
Option A
B
A line spectrum with 3 black lines in purple, one black line in blue, 2 black lines in light blue, one black line in orange and one black line in orange-red.
Option B
C
A line spectrum with 3 black lines in purple, 2 black lines in blue, 2 black lines in light blue, one black line in green and one black line in yellow.
Option C
D
A line spectrum with 4 black lines in blue, 6 black lines in green, 3 black lines in yellow and one black line in orange.
Option D
14

An absorption spectrum of oxygen is shown below.What is most likely the emission spectrum of oxygen?

Question illustration
A
A rainbow for a line spectra. There are 4 lines in purple, 4 lines in blue, 3 lines in blue-green, 6 lines in the yellow, 4 lines in the orange and 15 lines in red.
Option A
B
A rainbow for a line spectra. There are 4 lines in purple, 4 lines in blue, 3 lines in blue-green, 7 lines in the green, 6 lines in the yellow, 5 lines in the orange and 10 lines in red.
Option B
C
A rainbow for a line spectra. There are 4 lines in purple, 4 lines in blue, 2 lines in blue-green, 4 lines in the green, 2 lines in the yellow, 3 lines in the orange and 4 lines in red.
Option C
D
A rainbow for a line spectra. There are 5 lines in purple, 6 lines in blue, 1 line in blue-green, 4 lines in the green, 3 lines in the yellow, 4 lines in the orange and 4 lines in red.
Option D
15

The emission spectrum of the element lithium is shown below.What is the best estimate of the color that will be seen when a sample of lithium gas absorbs a lot of energy?

Question illustration
A
mix of blue and green
B
mix of red and orange
C
mix of yellow and green
D
pure yellow
16

Four students made a graphic organizer describing the parts of the atom.Which table best describes the parts of the atom?

A
A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries positive, 0, negative. The last column is labeled location with entries outside nucleus, outside nucleus, inside nucleus.
Option A
B
A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries negative, 0, negative. The last column is labeled location with entries inside nucleus, outside nucleus, inside nucleus.
Option B
C
A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries 0, negative, positive. The last column is labeled location with entries outside nucleus, inside nucleus, inside nucleus.
Option C
D
A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries positive, negative, 0. The last column is labeled location with entries inside nucleus, outside nucleus, inside nucleus.
Option D

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