Phase change Heat transfer

The density of a liquid is higher than the density of a gas because:

• particles of a gas are closer together than particles of a liquid.

• particles of a solid are closer together than particles of a liquid.

• particles of a liquid are closer together than particles of a gas.

• liquids take up more space than solids.

The density of an object equals:

Condensation occurs when:

• a gas changes to a liquid.

• a liquid changes to a gas.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Evaporation occurs when:

• a liquid changes to a gas.

• a gas changes to a liquid.

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NGSS.MS-PS1-4

The intermolecular forces holding molecules together are the strongest between molecules of a:

• Solid

• Liquid

• Gas

Which of the following is an example of radiation?

• Heat from a campfire

• Chocolate melting in your hand

• Hot air rising, cool air falling

The flow of thermal energy from higher temperature to lower temperature is:

• thermal equilibrium.

• heat transfer.

• heat conduction.

• thermal radiation.

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NGSS.MS-PS3-3

Which is NOT an example of heat transfer?

• Cold to hot

• Hot to cold

• Warm to cold

• Hot to warm

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NGSS.MS-PS1-4

The transfer of heat through gas or a liquid is known as:

• conduction.

• convection.

• radiation.

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NGSS.MS-PS3-3

Running across the hot road in the summer can burn your feet because heat is transferred through:

• conduction.

• convection.

• radiation.