Which statement best describes the kinetic molecular
theory?
The kinetic molecular theory relates the properties of a state of matter to the motion of
its molecules.
B
The kinetic molecular theory relates the properties of a state of matter to the mass of its
molecules.
C
The kinetic molecular theory relates the properties of a state of matter to the size of its
molecules.
D
The kinetic molecular theory relates the properties of a state of matter to the diameter of
its molecules.

A. The kinetic molecular theory relates the properties of a state of matter to the motion of  its molecules.

Explanation:

The higher the kinetic energy of the molecules, the faster its movement will be. The state of a matter will depend on how fast the molecules move. When the molecules barely move, it will be packed tightly and its state will be solid. If the molecules kinetic energy rises, eventually they start moving around and the state will be liquid. If the kinetic energy rises further, the molecule will expand and changed into gas form.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.