Whether a substance is a gas, liquid, or solid is dependent on the natural attractive forces between molecules and the extent of molecular motion as determined by the average KE and temperature. the kinetic energy of the molecules. the collisions between the molecules. how the molecules collide with the container.

The state of a substance (gas, liquid, or solid) is primarily dependent on:<br /><br />1. The natural attractive forces between molecules.<br />2. The extent of molecular motion as determined by the average kinetic energy (KE) and temperature.<br /><br />Therefore, the correct answer is:<br />- the extent of molecular motion as determined by the average KE and temperature.<br /><br />This is because the balance between the intermolecular forces and the kinetic energy of the molecules determines whether a substance will be in a solid, liquid, or gaseous state. At higher temperatures, the kinetic energy of the molecules increases, which can overcome the attractive forces and lead to a gaseous state. Conversely, at lower temperatures, the kinetic energy decreases, allowing the attractive forces to dominate, leading to a liquid or solid state.