Solids and Plasmas Answers

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What happens when the kinetic energy of molecules increases so much that electrons are released by the atoms, creating a swirling gas of positive ions and negative electrons?

A
Matter changes to a solid state.
B
Matter changes to a liquid state.
C
Matter changes to a plasma state.
D
Matter changes to a gaseous state.
2
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The repeating subunits that are responsible for the shape of a crystal are known as

A
unit cells.
B
heavy nuclei.
C
light electrons.
D
amorphous cells.
3

Which is an example of plasmas in nature?

A
solar cells
B
plasma balls
C
auroras
D
clouds
4

Substance X has a fixed volume, and the attraction between its particles is strong. Substance Y has widely spread out particles and can be compressed. What can most likely be concluded about these substances?

A
Substance X is a crystal, and substance Y is a liquid.
B
Substance X is a gas, and substance Y is a plasma.
C
Substance X is a plasma, and substance Y is a crystal.
D
Substance X is a solid, and substance Y is a plasma.
5

Keisha makes a table to compare plasmas and solids. PlasmaSolidKinetic energyX Density YWhich labels belong in the cells marked X and Y?

A
X: HighY: High
B
X: HighY: Low
C
X: LowY: High
D
X: LowY: Low
7

How does the motion of particles in the sun’s plasma compare to the motion of particles in a solid?

A
Particles in both the plasma and a solid move around to fill available space.
B
Particles in the plasma move randomly, but particles in a solid vibrate in one place.
C
Particles in the plasma have low kinetic energy, but particles in a solid have high kinetic energy.
D
Particles in both the plasma and a solid are made up of fast-moving electrons and cations.
8

A plasma that has particles that never collide frequently enough to exchange kinetic energy and never reach a temperature equal to the surroundings is categorized as a

A
thermal plasma.
B
ionized plasma.
C
low density plasma.
D
nonthermal plasma.
9

What are thermal plasmas?

A
plasmas that have particles that collide infrequently
B
plasmas that reach a temperature equal to their surroundings
C
plasmas that do not reach thermal equilibrium
D
plasmas that have only a few particles ionized at any given moment
10

Which is an example of a plasma that occurs in nature?

A
a burning tree
B
the radiant sun
C
a melting candle
D
an electric current

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