Final answer:
The statement that plasmas are made up of particles with a positive or negative charge correctly describes plasmas. Unlike gases with neutral particles, plasmas contain electrically charged ions and exhibit indefinite shape and volume.
Step-by-step explanation:
The statement that correctly describes plasmas is C. Plasmas are made up of ions, which are particles with a positive or negative charge. Plasmas, like gases, have an indefinite shape and an indefinite volume, and they are considered to be fluids because they flow. However, unlike gases which are made up of particles with a neutral charge, plasmas contain a significant number of electrically charged particles. These charged particles are the result of atoms that have been ionized, meaning that the electrons (negative charge) are separated from the nucleus (positive charge). Therefore, statement B is incorrect because plasma particles are not neutral. Plasmas are difficult to contain due to their high energy levels and are found in various high-temperature environments such as the interiors of stars, lightning strikes, and certain types of analytical instruments.
Plasmas are a gaseous state of matter that contains appreciable numbers of electrically charged particles. They are different from gases because they have ionized particles, which means they have positive or negative charges. Plasmas have an indefinite shape and volume because the particles are far apart from each other and there is much space and little force between them. Therefore, option C is the correct statement that describes plasmas.