A combination of neutral atoms, free electrons, and atomic nuclei ...

[P68T]

A combination of neutral atoms, free electrons, and atomic nuclei describes:
 
  a. potential energy.
  b. kinetic energy.
  c. plasma.
  d. compressed gases.

Question 2

Which of the following is a false statement about O2?
 
  a. No pressure can keep it in a liquid state above 118.8 C.
  b. Below its boiling point, it remains liquid at ambient pressure.
  c. Its critical temperature is above normal room temperature.
  d. It cannot be turned into a liquid at room temperature.

[Andromeda18]

Answer to Question 1

ANS: C
Plasma has been referred to as the fourth state of matter and is a combination of neutral atoms, free electrons, and atomic nuclei. Plasmas can react to electromagnetic forces and flow freely like a liquid or a gas.

Answer to Question 2

ANS: C
Liquid O2 is produced by separating it from a liquefied air mixture at a temperature below its boiling point or critical temperature (183 C or 297 F). After it is separated from air, the O2 must be maintained as a liquid by being stored in insulated containers below its boiling point. As long as the temperature does not exceed 183 C, the O2 will remain liquid at atmospheric pres-sure. If higher temperatures are needed, higher pressures must be used. If at any time the liquid O2 exceeds its critical temperature of 118.8 C, it will convert immediately to a gas.