Energy Unit Review

The molecules of which have the most kinetic energy?

• an ice cube

• boiling water

• a warm cup of tea

• a glass of ice water

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Temperature is a way to measure the ______________ energy.

• average kinetic

• average potential

• average electrical

• average potential

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Assuming room temperature is greater than temperature of the ice water shown below, select the two ways that show how energy is being transferred. 

• Heat flows from the ice cubes into the water and from the water to the air.

• Heat flows from the cup into the air in the room and from the cup to the counter.

• Heat flows from the water into the ice cubes and from the air to the cup

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As the temperature of air increases, what happens to the speed of its molecules?

• Their speed will decrease because the particles have more kinetic energy

• Their speed will increase because the particles have more kinetic energy

• Their speed will increase because the particles have less kinetic energy

• Their speed will decrease because the particles have less kinetic energy

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Heat is a measure of how much energy flows from __________ objects to _________ objects. It _________ the same thing as temperature. 

• cold; hot; is

• cold; hot; is not

• hot; cold; is

• hot; cold; is not

How could you measure the average kinetic energy of a group of particles?

• Measure its mass with a scale.

• Measure the volume of the particles using the water displacement method.

• Measure the altitude of the particles using a barometer.

• Measure its temperature with a thermometer.

Which is an example of heat transfer by conduction?

• Stove top to a pan

• A sunburn at a baseball game

• Photosynthesis

• A campfire

Warming your hands by a campfire is an example of which type of thermal energy transfer?

• conduction

• convection

• radiation

Air moving in the atmosphere is an example of

• conduction

• convection

• radiation

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According to the cup wall diagrams, why does the double wall vacuum sealed cup outperform the other two cups

• Because the particles are moving so fast in a vacuum that they are able to pass through the walls and transfer more kinetic energy to the liquid in the cup.

• The vacuum allows for the all of the particles to pack in tightly therefore nothing can pass through.

• There is little to no transfer of kinetic energy between the walls of the cups because there are no particles in a vacuum. And since there is little to no transfer of kinetic energy there is little to no transfer of temperature. Therefore the liquid inside stays warmer/colder longer.

• The particles in a vacuum do not move at all. Therefore there is no kinetic energy and nothing can be transferred.

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