Formative 8C: Types of Heat Transfer

When you hold your hands over a fire and feel heat, this is an example of which type of heat transfer?

• convection

• radiation

• conduction

• sublimation

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GA.SPS7.b.

Heat transfer that occurs by direct contact is refered to as

• radiation

• convection

• conduction

• sublimation

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GA.SPS7.b.

Water circulating in a tea kettle, with hot water rising and cold water falling, is refered to as

• radiation

• conduction

• convection

• sublimation

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GA.SPS7.b.

In a system, thermal energy always moves from a region of higher temperature to lower temperature. The movement of thermal energy continues until the temperature reaches equilibrium in the system. Thermal energy is measured by the motion of particles in a substance. A substance with high thermal energy has particles that are moving faster than a substance with less thermal energy. Thermal energy moves from one region to another by one of three methods—conduction, convection, or radiation. Based on the model of the house, match the word that describes the type of thermal energy transfer to the correct letter in the model.

• radiation

• A

• convection

• C

• conduction

• B

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GA.SPS7.b.

The photograph shows water boiling on a stove. How do the molecules of metal and water in the pot transfer thermal energy when they are heated? Select all that apply.

• The molecules in the water transfer thermal energy through radiation.

• The molecules in the water transfer thermal energy through conduction.

• The molecules in the water transfer thermal energy through convection.

• The molecules of metal in the pot transfer thermal energy through convection.

• The molecules of metal in the pot transfer thermal energy through conduction.

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GA.SPS7.b.

Damien sets up an experiment to investigate particle motion and heat transfer. He attaches a paperclip to an iron rod with wax. He suspends the iron rod above a spirit lamp and lights the spirit lamp to heat the rod. The set up is shown in the picture. After two minutes of heating the iron rod, the wax that attaches the paperclip to the rod melts and the paperclip falls to the table. Explain the cause of these results.

• The particles in the rod move towards the heat as the rod is heated by the spirit lamp. The movement of these particles causes the wax to become heated and melt, letting the paperclip fall to the table.

• The particles in the rod move away from the heat as the rod is heated by the spirit lamp. The movement of these particles causes the wax to become heated and melt, letting the paperclip fall to the table.

• The particles in the rod nearest to the spirit lamp begin to move faster when heated. These particles collide into nearby particles, slowly transferring heat energy along the rod to reach the wax. This causes the wax to melt, letting the paperclip fall to the table.

• The particles in the rod nearest to the spirit lamp begin to move slower when heated. These particles form a rigid grid with nearby particles, slowly transferring heat energy along the rod to reach the wax. This causes the wax to melt, letting the paperclip fall to the table.

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GA.SPS7.b.

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?

• 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 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.

Tags

GA.SPS7.b.