Solids and Plasmas Answers

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1
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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.
2
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A group of students are wandering around a room. When their teacher claps, the students sit down wherever they are.This situation best models the formation of which type of solid?

A
an amorphous solid because the particles do not have a regular structure
B
an amorphous solid because the motion of the particles stopped
C
a crystalline solid because the moving particles lock into fixed positions
D
a crystalline solid because the particles have a long-range order
3

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
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

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.
6

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
7

Which reason best explains why plasmas are good conductors of electricity?

A
They have mobile charged particles.
B
They are at extremely high temperatures.
C
They are made up of particles in fixed positions.
D
They have slow-moving nuclei that carry electricity.
8

Temperature depends on the average kinetic energy of the particles in a sample. How does this help explain why a plasma-based light does not have a high temperature?

A
No particles in the plasma have high kinetic energy.
B
The fastest particles have the greatest mass.
C
Most particles in the plasma are heavy, slow, and very low density.
D
The fastest particles transfer most of their energy through collisions.
9

Which is an example of plasmas in nature?

A
solar cells
B
plasma balls
C
auroras
D
clouds
10

Which low-energy state of condensed matter is characterized by structural rigidity and resistance to changes of shape or volume?

A
gas
B
liquid
C
plasma
D
solid

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