6.9AB Thermal Energy Transfer Post-Test

Conduction can only occur between two objects when-

• one object is less dense than the other.

• both objects are in physical contact with each other.

• one of the objects is made of a metal.

• both objects are exactly the same temperature.

Answer explanation

Remember: CONDUCTION = TOUCH!

Look at the picture provided. In the situation illustrated, how will heat energy move? Heat energy will be transferred from-

• the water to the hot plate by convection.

• the water to the hot plate by conduction.

• the hot plate to the water by convection.

• the hot plate to the water by conduction.

Answer explanation

REMEMBER: Heat ALWAYS moves from HOTTER to COOLER!

Radiation is a method of thermal energy transfer. It refers to the transfer of heat energy that moves-

• through empty space.

• when objects touch.

• only through solids.

• in the motion of fluids.

Answer explanation

Remember: RADIATION = OPEN SPACE!

Which of the following is an example of a situation in which an egg is receiving thermal energy through convection?

• The egg is kept warm by its mother in the nest.

• An egg cracked on a hot sidewalk starts to cook.

• The egg is hard boiled in a pot of water.

• A metal pan on the stove fries the egg.

Answer explanation

Remember: CONVECTION = LIQUID OR GAS!

Three metal cubes with different temperatures are placed side-by-side as shown in the picture provided. Which of the following describes a way in which heat energy will be transferred by conduction?

• Sample 1 to Sample 2

• Sample 3 to Sample 2

• Sample 3 to Sample 1

• Sample 2 to Sample 3

Answer explanation

Remember: Objects must be TOUCHING for conduction to work. Also, heat always moves from HOTTER to COOLER! :)

Tags

NGSS.MS-PS1-4

Which of the following sets of tools would be most useful in an experiment measuring the rate of transfer of thermal energy in four different liquids?

• triple-beam balance, beakers, metric ruler

• hot plate, beakers, thermometers

• microscope, funnel, metric ruler

• pH meter, test tubes, forceps

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

In an energy transfer experiment, four blocks of different temperatures are stacked. Where would energy transfer by conduction moved downward, from a higher block to a lower block.

• Sample 2 to Sample 4

• Sample 1 to Sample 2

• Sample 3 to Sample 4

• Sample 1 to Sample 3

Answer explanation

Remember: Heat always moves from HOTTER to COOLER!

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Four containers made of different materials, each containing water at 30 degrees Celsius, were set out on a table. The initial temperature of the water was recorded. The temperature of the water was also recorded 15 minutes later. Which container was the most effective at preventing heat transfer from the water to the environment? 

• Container P

• Container Q

• Container R

• Container S

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

NGSS.MS-PS3-5

When an egg is boiled in a pot of water on the stove, there is more than one kind of heat transfer. Heat is transferred from the stove to the pot directly since they are both physically touching. Heat is also transferred from the pot to the egg, carried through the water. What two kinds of heat transfer are represented?

• Stove > Pot = Radiation, Pot > Egg = Conduction

• Stove > Pot = Conduction, Pot > Egg = Radiation

• Stove > Pot = Convection, Pot > Egg = Conduction

• Stove > Pot = Conduction, Pot > Egg = Convection

Which of the following is an example of conduction?

• Solar energy warming a room

• Heat rising from the coils of a stove

• Hot air drying out a wet towel

• Heat moving from a clothes iron to a shirt