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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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.
3

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
4

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.

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