Final answer:
The particles in a gas move randomly, are not tightly packed, have no fixed shape or volume, and are in constant motion due to thermal energy, consistent with option (c) from the given choices.
Step-by-step explanation:
Regarding the particles in a gas, the correct statement would be that they move randomly and have no fixed shape or volume, option (c). This is because:
Gases consist of tiny particles of matter that are in constant motion.
Gas particles are constantly colliding with each other and the walls of a container. These collisions are elastic, meaning there is no net loss of energy from the collisions.
The particles in a gas are separated by large distances, and there are no interactive forces, such as attraction or repulsion, between them.
The average speed of gas particles is dependent on the temperature of the gas.
Gases do not have a definite shape or volume, and they expand to fill the available space in a container.
Therefore, the particles in a gas are not tightly packed with fixed positions, they do not have a definite shape or volume, and they do not move in an orderly pattern. The properties of gas particles are consistent with the behavior described in option (c).