Solids and Plasmas Answers

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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

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

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.
6

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.
7

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.
8

Which is an example of plasmas in nature?

A
solar cells
B
plasma balls
C
auroras
D
clouds

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