Unit 3 Quiz 3

Which reason best explains why plasmas are good conductors of electricity? They have mobile charged particles. They are at extremely high temperatures. They are made up of particles in fixed positions. They have slow-moving nuclei that carry electricity.

They have mobile charged particles.

Which best explains why a crystal is incompressible? Its molecules remain in position without vibrating. The molecules of a crystal behave like those of a gas. There is little, if any, space left between its adjacent molecules. Its molecules switch positions when they are compressed.

There is little, if any, space left between its adjacent molecules.

What are thermal plasmas? plasmas that have particles that collide infrequently plasmas that reach a temperature equal to their surroundings plasmas that do not reach thermal equilibrium plasmas that have only a few particles ionized at any given moment

plasmas that reach a temperature equal to their surroundings

Which is an example of a plasma that occurs in nature? a burning tree the radiant sun a melting candle an electric current

the radiant sun

How does the motion of particles in the sun's plasma compare to the motion of particles in a solid? Particles in both the plasma and a solid move around to fill available space. Particles in the plasma move randomly, but particles in a solid vibrate in one place. Particles in the plasma have low kinetic energy, but particles in a solid have high kinetic energy. Particles in both the plasma and a solid are made up of fast-moving electrons and cations.

Particles in the plasma move randomly, but particles in a solid vibrate in one place.

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? Substance X is a crystal, and substance Y is a liquid. Substance X is a gas, and substance Y is a plasma. Substance X is a plasma, and substance Y is a crystal. Substance X is a solid, and substance Y is a plasma.

Substance X is a solid, and substance Y is a plasma.

Which is an example of plasmas in nature? solar cells plasma balls auroras clouds

auroras

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

solid

Which description best characterizes the motion of particles in a solid? slow but able to move past one another fast and widely spaced not moving vibrating around fixed positions

vibrating around fixed positions