The video explains the four common phases of matter: solid, liquid, gas, and plasma, and how energy affects phase transitions. It details molecular structures in each phase and describes phase transitions like melting, vaporization, and ionization. The video also explains the refrigeration cycle, highlighting how phase changes in freon gas are used to cool the interior of a refrigerator.

Which phase of H2O is characterized by densely packed molecules in a rigid configuration?

• Plasma

• Solid

• Liquid

• Gas

What happens to the molecules of a substance during the transition from liquid to gas?

• They form a rigid configuration.

• They occupy the entire volume of the container.

• They become more densely packed.

• They move closer together.

Which phase transition involves the change from solid directly to gas?

• Ionization

• Fusion

• Vaporization

• Sublimation

What is required for a substance to transition from gas to plasma?

• Decrease in temperature

• Increase in pressure

• Addition of energy

• Removal of energy

Which phase transition involves the release of energy as a gas turns into a liquid?

• Deposition

• Deionization

• Freezing

• Condensation

What happens to the energy of molecules during the freezing process?

• Energy remains constant.

• Energy is converted to work.

• Energy is released.

• Energy is absorbed.

In the cooling cycle of a refrigerator, what causes the high-pressure gas to condense to liquid?

• Heat loss to the surrounding air

• Work done by the compressor

• Decrease in pressure

• Increase in temperature

Tags

NGSS.HS-PS3-4

What is the role of the electrically run compressor in a refrigerator?

• To decrease the pressure of the gas

• To increase the pressure of the gas

• To convert heat to work

• To release energy

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NGSS.HS-PS3-4

How does a refrigerator reduce the temperature inside it?

• By absorbing heat from the room

• By releasing heat into the room

• By absorbing heat from inside the refrigerator

• By converting work to heat

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NGSS.HS-PS3-4

How do refrigerators differ from heat engines?

• Refrigerators convert heat to work.

• Heat engines convert work to heat.

• Refrigerators convert work to heat.

• Heat engines cycle the compression and expansion of gas.