Question

A science teacher reviewed heat transfer with the students in a class by performing several demonstrations.The students observed that tables in sunlight felt warmer than tables in shade. The students know that sunlight is a form of energy, and energy is often transferred to other objects or transformed to some other form of energy.

Next, the teacher used a hot plate to boil water in a metal pan. The students saw bubbles begin to form on the bottom of the pan and rise to the top as the water was heated. The students recorded their observations and conclusions about the energy transformations and transfers in the demonstrations.

The teacher's demonstrations included all three methods of heat transfer. Identify the part of the experiment and name the correct method of heat transfer that the student's would have seen during the teacher's demonstration. Explain how you know this is the correct identification. Your answer must be in complete sentences.

Answer 1

The first demonstration involving the tables in sunlight and shade would illustrate heat transfer through radiation. This is because the heat is transferred from the sun to the table through electromagnetic waves, without the need for a medium to conduct the heat. The students would have observed that the tables in sunlight felt warmer because they were receiving more radiant energy from the sun.

The second demonstration involving the boiling water in a metal pan would illustrate heat transfer through convection. This is because the heat from the hot plate is transferred to the metal pan through conduction, and then the heated water rises and transfers the heat through convection as the bubbles rise to the top. The students would have observed the bubbles rising and concluded that the heat was being transferred through the movement of the water.

The third method of heat transfer, conduction, could have been demonstrated by having the students touch different objects of varying temperatures. The heat would be transferred from the hotter object to the cooler object through direct contact, without any movement of matter. However, this method of heat transfer was not explicitly mentioned in the given experiment.

Step-by-step explanation: