Hannah heats a beaker of water using a burner, as shown in the diagram.

Question

Which statement best describes the movement of water molecules in Hannah's beaker, represented by the arrows in the diagram?

(1 point)
Responses

Water molecules move faster near the bottom of the water where they are hotter, but then move slower as they cool and rise due to radiation.
Water molecules move faster near the bottom of the water where they are hotter, but then move slower as they cool and rise due to radiation.

Water molecules move slower near the bottom of the beaker where they are hotter, but then move faster as they cool and rise due to convection.
Water molecules move slower near the bottom of the beaker where they are hotter, but then move faster as they cool and rise due to convection.

Water molecules move faster near the bottom of the beaker where they are hotter, but then move slower as they cool and rise due to convection.
Water molecules move faster near the bottom of the beaker where they are hotter, but then move slower as they cool and rise due to convection.

Water molecules move slower near the bottom of the beaker where they are hotter, but then move faster as they cool and rise due to conduction
Water molecules move slower near the bottom of the beaker where they are hotter, but then move faster as they cool and rise due to conduction
Skip to navigation

Answer 1

The best statement that describes the movement of water molecules in Hannah's beaker is:

Water molecules move faster near the bottom of the beaker where they are hotter, but then move slower as they cool and rise due to convection.

This is because, when water is heated, the molecules gain kinetic energy and move faster at the bottom of the beaker, where the heat is applied. As these heated molecules rise (due to convection), they transfer heat to the cooler water at the top, causing them to slow down as they cool.