Question

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



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

(4 points)

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 conduction.

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 beaker where they are hotter, but then move slower as they cool and rise due to convection.
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Answer 1

"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."

Explanation: Heating at the bottom increases molecular speed and reduces density so the warm water rises; it cools near the top, slows, becomes denser and sinks, producing convection currents.