Question

2 a student conducts an investigation in which they heat water on a hot plate. which of the following answers explains results they may get from this investigation? a thermal energy transfers from warmer molecules to cooler ones in the water via convection. b thermal energy travels through the cooler molecules in the water to warmer ones after contacting the hot plate c the water will heat up faster if the sun is shining, because radiation conducts thermal energy d conduction allows the cooler molecules to transfer heat energy to warmer molecules

Explanation:

• Option A: In a fluid like water, heat transfer via convection involves warmer (less dense) molecules rising and cooler (more dense) molecules sinking, transferring thermal energy from warmer to cooler molecules. This matches how heating water on a hot plate works.
• Option B: Thermal energy flows from warmer to cooler molecules, not the reverse, so this is incorrect.
• Option C: Radiation is a different heat transfer method, and "radiation conducts thermal energy" is incorrect (conduction is different from radiation). Also, the Sun's radiation isn't the main factor here as the water is heated on a hot plate.
• Option D: Conduction (and heat transfer in general) is from warmer to cooler molecules, not the other way, so this is incorrect.

Answer:

A. Thermal energy transfers from warmer molecules to cooler ones in the water via convection.