Solids and Plasmas Answers

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1
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Which best explains why a crystal is incompressible?

A
Its molecules remain in position without vibrating.
B
The molecules of a crystal behave like those of a gas.
C
There is little, if any, space left between its adjacent molecules.
D
Its molecules switch positions when they are compressed.
2
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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.
3

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.
4

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.
5

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
6

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.
7

Which state of matter is characterized by ionized particles, no definite shape or volume, and good electrical conductivity?

A
gas
B
liquid
C
plasma
D
solid
8

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.
9

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.
10

Which description best characterizes the motion of particles in a solid?

A
slow but able to move past one another
B
fast and widely spaced
C
not moving
D
vibrating around fixed positions

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