Question

1. describe the movement of the particles at the boiling point of a substance. consider what is happening with temperature and energy.

Explanation:

At a substance's boiling point, thermal energy is added but temperature stays constant. This energy breaks intermolecular bonds holding liquid particles together, not increasing particle kinetic energy. Liquid particles gain enough potential energy to overcome attractive forces, moving from a tightly packed, sliding liquid state to a much more spread-out, rapidly moving gaseous state where particles move freely and randomly in all directions.

Answer:

When a substance is at its boiling point:

1. Temperature: The temperature of the substance remains constant, even as more thermal energy is added.
2. Energy: The added thermal energy is used to break the intermolecular forces between the particles (increasing their potential energy), rather than increasing the kinetic energy of the particles.
3. Particle Movement: The particles, which were previously sliding past one another in the liquid phase, gain enough energy to break free from their neighboring particles. They transition into the gaseous phase, where they move rapidly, randomly, and independently in all directions, with a much greater average distance between particles compared to the liquid state.