According to the kinetic molecular theory, which statement describes the particles in a sample of an

August 2019 NY Regents Chemistry Exam

18 According to the kinetic molecular theory, which statement describes the particles in a sample of an ideal gas?

(1) The particles are constantly moving in circular paths.

(2) The particles collide, decreasing the total energy of the system.

(3) The particles have attractive forces between them.

(4) The particles are considered to have negligible volume.

Solution: Kinetic molecular theory has the following statements which need to be memorized:

Gas particles have negligible volume.
Gas particles are in continuous random motion and move in straight lines.
No forces of attraction or repulsion are considered to exist between the particles.
Collisions of gas particles may transfer energy from one particle to another, but the total kinetic energy remains the same.

Answer: 4

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